Title of Invention	A PROCESS FOR PREPARING UREA GROUP-CONTAINING AMINE HARDENER MIXTURES
Abstract	The invention relates to a polyamines comprising urea groups, a method for their production, and to their use for producing adhesives, sealing compounds, casting compounds, shaped parts or coatings.

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FORM 2 THE PATENTS ACT 1970 COMPLETE SPECIFICATION [See Section 10] 'A PROCESS FOR PREPARING UREA GROUP-CONTAINING AMINE HARDENER MIXTURES" BAYER AKTIENGESELLSCHAFT, a company of Germany, of D-51368 Leverkusen, Germany, The following specification particularly describes and ascertains the nature of the invention and the manner in which it is to be performed:- 13 JUL 2005 Le A 33 696 Foreign Countries Eek / wa/NT Polyamines which contain urea-group a PROCESS for the preparation thereof and their use no hardeners for epoxide resins The present invention provides polyamines which contain urea groups, a process for the preparation thereof and their use to produce adhesives, sealants, embedding compounds, moulded items or coatings. Polyamine/epoxide resin systems are characterised, inter alia, by excellent adhesion to 10 metals, very good resistance to chemicals and outstanding corrosion prevention properties. In the case of solvent-containing formulations and powder coating systems, cross-linked films with high flexibility are obtained by using epoxide resins with high molecular weights and/or polyaminoamides, e.g. those based on dimeric fatty acids, as hardeners. Coatings based on solvent-free liquid resins and solvent-free amino hardeners are brittle due to the low molecular weights of the epoxide 15 resins and the high network density resulting there from. Nowadays, therefore, tar substitutes, e.g. coumarone resins, are used for plasticising purposes in solvent-free formulations. These types of coating tend to become brittle in the long term, in particular when using relatively large amounts of hydrocarbon resins, due to migration of the non-functional constituents. 20 Good and permanent elastification of epoxide resins can be achieved by combining them with polyurethanes. Thus, e.g. in DE-A 23 38 256, high molecular weight amine-terminated polyetherurethane ureas are prepared by reacting prepolymers which contain free isocyanate groups with amines in highly dilute solution and then 25 curing the product with epoxide resins. The use of the, in particular aromatic, solvents required for this is a disadvantage in practice, both from an industrial and also a physiological point of view. On the other hand, the viscosity of the solvent-free reaction products, such as those prepared in accordance with DE-A 23 38 256, is too high for use in practice. Original IN / PCT / 2002 /00085 / MUM 2 Le A33-696=Foreign Countries J* DE-A 24 18 041 describes a process for preparing excised moulded articles and two-dimensional structures in which epoxide and amine compounds are reacted which are obtained by hydrolysis of prepolymeric ketimines or enamines. Using this process, thermoset materials which are resistant to chemicals, adhere well and have 5 improved properties are obtained. However, the process described is costly from a technical point of view. DE-A 21 52 606 describes reactive systems based on alkylphenol-blocked polyisocyanates and polyamines, which may optionally also be cured in combination with epoxide resins. These reactive systems are also associated with some technical disadvantages: on the one hand, the blocking agents being released have comparatively low molecular weight so they migrate out of the coating over the course of time, which can lead to adhesion problems. On the other hand, reactive systems based on alkylphenol-blocked polyisocyanates and polyamines have a relatively high viscosity and the actual mechanical properties of the end products do not satisfy all requirements. In contrast to this, EP-A 480 139 describes a process for reacting non-blocked NCO prepolymers with polyamines at temperatures of 140-170°C. However, this process can be applied only to prepolymers with aliphatic or cycloaliphatic isocyanate groups due to the very high reactivity of aromatic isocyanate groups when reacting with amines. Since aliphatic and cycloaliphatic isocyanates can be prepared only in a more costly manner (more expensively) than aromatic isocyanates, polyurethanurea amines prepared by this method have hitherto been of no industrial significance. In order to facilitate targeted reaction of polyisocyanate prepolymers with excess amounts of diamine, it has therefore been suggested on several occasions that the polyisocyanates be used in a blocked form, as described for instance, in CA-A 12 19 986, EP-A 293 110 or EP-A 82 983. These publications disclose using, as preferred blocking agents, phenols or substituted phenols. After completion of reaction with the polyamines, these phenols cannot be removed, or not completely removed, from 3 Le A33-696 –Foreign Countries the reaction mixture by distillation, due to their high boiling point. Retention of these optionally substituted phenols in the mixture or in the plastic materials, however, leads to the disadvantages mentioned above. Furthermore, it is pointed out in these publications' that in principle the other conventional blocking agents from poly- 5 urethane chemistry may also be used, e.g. oximes, caprolactam, malonates and acetoacetates. However, since none of these blocking agents can be incorporated into the polymer structure during the course of epoxide hardening, these types of compounds are not normally used in traditional amine/epoxide chemistry. The use of such blocking agents instead of the preferably used, optionally substituted, phenols, 10 does not provide significant advantages. In accordance with EP-A 457 089, on the other hand, secondary amines with preferably low boiling points are used as blocking agents. If these amines are retained in the reaction mixture after de-blocking, slow evaporation of the very 15 pungent compounds (odour pollution) readily takes place. Although in principle the secondary amine can be incorporated into the system when used in epoxide systems, this takes place relatively slowly, especially in the case of applications at low temperatures (e.g. room temperature) so that some of the amines evaporate before reacting. In a particularly preferred application, the amine blocking agent is distilled 20 out of the reaction mixture after de-blocking. Although this procedure leads to products which do not release a gas (odour pollution), it is very costly. Thus, the object of the invention was to provide elasticising, amine hardener mixtures for epoxides which do not have the disadvantages of the systems in the 25" prior art. The object can be achieved by the provision of the hardener mixtures according to the invention and the process for preparing them which are described in detail below. 30 The invention provides urea group-containing, amine hardener mixtures for epoxide resins, prepared by reacting 4 Le A 33 696-Foreign Countries ~4 A) a polyisocyanate component, consisting of at least one organic polyiso- cyanate, in which at least 95 mol.% of the NCO groups are reversibly blocked by reaction with at least one phenolic group-containing hydrocarbon resin 5 with a concentration of hydroxyl groups, calculated as OH, molecular weight = 17, of 0.1% to 10.0%, with 10 B) at least one organic polyamine in a ratio by equivalents of amine groups to blocked NCO groups of 2:1 to 50:1. The invention also provides a process for preparing these urea group-containing, amine hardener mixtures. The invention also provides the use of these urea group-containing, amine hardener 15 mixtures in combination with the epoxide resins conventionally used in plastics and coating technology, optionally in combination with catalysts, auxiliary substances and additives conventionally used in plastics and coating technology, to prepare adhesives, sealants, embedding agents, moulded items or coatings. 20 The invention is based on the surprising observation that reactive systems based on urea group-containing, amine hardener mixtures according to the invention and epoxides cure to give plastics materials which are characterised by long-term elastification with a surprisingly beneficial relationship between plasticity on the one hand and elasticity on the other hand. 25 30 The starting compounds for preparing part A) in urea group-containing amine hardener mixtures according to the invention are organic polyisocyanates in which at least 95 mol.% of the NCO groups are reversibly blocked by reaction with at least one phenolic OH group-containing hydrocarbon resin of the type described in detail below. 5 Le A 33 696-Foreign Countries ,5- Polyisocyanates which are suitable for preparing part A) which is an essential constituent of the invention are organic polyisocyanates or polyisocyanate mixtures with a (mean) molecular weight, determined from the isocyanate content and functionality, of 168 to 25000, preferably 1000 to 12000. Suitable starting 5 polyisocyanates are aliphatic isocyanates known per se from polyurethane chemistry such as hexamethylenea diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, the isomers of diphenylmethane diisocyanates and their higher homologues such as are produced by phosgenation of aniline/formaldehyde conden- , sation products, aromatic diisocyanates such as 2,4- and 2,6-toluylene diisocyanate 10 and their technical grade mixtures. Also suitable are secondary products known per se of the isocyanates mentioned with biuret, isocyanurate, iminooxadiazinedione, uretdione, allophanate and/or urethane structures. The polyisocyanates for preparing the starting compounds A) are preferably iso- 15 cyanate group-containing prepolymers such as can be obtained in a manner known 20 per se by reacting low or high molecular weight polyhydroxyl compounds with excess amounts of the previously mentioned di- and polyisocyanates or even with a large excess of the di- and polyisocyanates mentioned followed by removal of the excess polyisocyanate, e.g. by thin layer distillation. Aromatic polyisocyanates with a molecular weight in the range 174 to 300 are particularly preferably used to synthesise the prepolymers. The prepolymers are generally prepared at 40 to 140°C, optionally also using catalysts known per se from polyurethane chemistry such as, for example, organometallic compounds such as tin(II) octoate, dibutyltin(II) diacetate, dibutyltin(II) dilaurate or tertiary amines such as triethylamine or diazabicyclooctane. 30 Low molecular weight polyhydroxyl compounds with molecular weights in the range 62 to 299 such as, for example, ethylene glycol, propanediol-1,2, propylene glycol-1,3, butanediol-1,2, butanediol-1,3, butanediol-1,4, pentanediol-1,2, pentanediol-1,5, hexanediol-1,6, octanediol-1,8, dodecanediol-1,12, neopentyl glycol, 2-ethylhexane-diol-1,3, trimethylpentanediols, butylethylpropanediol-1,3, cyclohexanedimethanols, 6 Le A 33 696-Foreign Countries 6- 5 glycerol, trimethylolpropane, pentaerythritol, low molecular weight hydroxyl group-containing esters of these types of polyols with dicarboxylic acids of the type mentioned below by way of example or low molecular weight ethoxylation or propoxylation products of these types of simple polyols or any mixture of these types of modified or non-modified alcohols are suitable for preparing these types of prepolymers. High molecular weight polyhydroxyl compounds with a molecular weight in the range 300 to 20000, preferably 1000 to 8000, of the type known per se from 10 polyurethane chemistry are preferably used to prepare the prepolymers. High molecular weight polyhydroxyl compounds for preparing the prepolymers are, for example, polyesterpolyols corresponding to the specified data which are based on low molecular weight simple alcohols of the type mentioned above by way of example and polybasic carboxylic acids such as, for example, adipic acid, sebacic 15 acid, phthalic acid, isophthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, maleic acid, the anhydrides of these types of acids or any mixture of these types of acids or anhydrides. Hydroxyl group-containing polylactones corresponding to the data given above, in particular poly-s-caprolactone, are also suitable for preparing the prepolymers or semiprepolymers. 20 Polyetherpolyols corresponding to the specifications given above, such as can be obtained in a manner known per se by the alkoxylation of suitable starter molecules, are particularly preferred for preparing isocyanate-group containing prepolymers. Suitable starter molecules are, for example, the simple polyols already mentioned 25 above, water, organic polyamines with at least two N-H bonds or any mixture of these types of starter molecules. Alkylene oxides which are suitable for the alkoxylation reaction are in particular ethylene oxide and/or propylene oxide, which may be used in any sequence or even as a mixture during the alkoxylation reaction. 7 Le A 33 696-Foreign Countries Polytetramethylene glycol polyethers corresponding to the data given above, such as can be obtained in a manner known per se by cationic polymerisation of tetrahydro-furan, are also preferably suitable for preparing the prepolymers. 5 Also suitable for preparing the prepolymers are hydroxyl group-containing polycarbonates corresponding to the data given above, such as can be prepared, for example, by reacting simple diols of the type mentioned above with diaryl carbonates such as, for example, diphenyl carbonate or phosgene. 10 Polythioetherpolyols, such as can be obtained, for example, by the polycondensation of thiodiglycol with itself or with diols and/or polyols of the type mentioned, are also suitable for preparing NCO group-containing prepolymers. Polyacetals such as e.g. the polycondensation products of formaldehyde and diols or 15 polyols of the type mentioned, such as can be obtained, for example, by using acid catalysts such as phosphoric acid or p-toluenesulfonic acid are also suitable. Obviously, mixtures of the hydroxyl compounds mentioned by way of example may also be used to prepare the prepolymers. 20 Particularly preferred polyisocyanates for part A) for preparing urea group-containing amine hardener mixtures are prepolymers based on aromatic polyisocyanates and polyetherpolyols of the type mentioned previously. 25 Suitable phenolic OH group-containing hydrocarbon resins which are used according to the invention for preparing the blocked polyisocyanates used as part A) are those of a generally known type such as are described, for example, in Ullmanns Encyklo- padie der technischen Chemie, 4th edition, vol. 12, pages 539 to 545, (Verlag Chemie, Weinheim 1976), Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd 30 ed., vol. 12, pages 852 to 869 (John Wiley & Sons, New York 1980) or Encyclopedia of Polymer Science and Engineering, vol. 7, pages 758 to 782 (John Wiley & Sons, Le A 33 696-Foreign Countries New York 1987). Examples of suitable phenolic OH group-containing hydrocarbon resins are coumarone/indene resins, petroleum resins or terpene resins. These types of phenolic OH group-containing hydrocarbon resins are typically 5 prepared by the copolymerisation of unsaturated hydrocarbons of the previously mentioned type with phenol in the presence of strong acids or catalysts of the Friedel-Crafts type. Suitable unsaturated hydrocarbons for preparing OH functional hydrocarbon resins which can be used according to the invention are the hydrocarbons produced during the cracking of naphtha or gas oil such as, for example, 10 butene, butadiene, pentene, piperylene, isoprene, cyclopentadienea, styrene, oc-methyl-styrene, vinyltoluene, dicyclopentadiene, methyldicyclopentadiene, indene and methylindene. Terpene resins such as, for example, oc-pinene, p-pinene, dipentene, D-limonene or turpentine are also suitable as unsaturated hydrocarbons which can be used to prepare OH-functional hydrocarbon resins which can be used according to 15 the invention. Hydrocarbon resins which can be used have a hydroxyl group content, calculated as OH (molecular weight = 17), of 0.1 % to 10.0 % and preferably have a hydroxyl group content of 1.0 % to 6.0 %. Hydrocarbon resins with a hydroxyl group content of 1.5 % to 4.0 % and which are liquid at room temperature are particularly preferably used to prepare part A). 20- Polyisocyanates with reversibly blocked isocyanate groups which are suitable for use as part A) according to the invention are prepared by reacting organic polyiso- cyanates of the previously mentioned type at temperatures of 40°C to 150°C, preferably 50°C to 100°C with phenolic OH group-containing hydrocarbon resins as 25 characterised in more detail previously. The amount of phenolic OH group-con taining hydrocarbon resin used in the blocking reaction should correspond to at least 95 mol.% of the amount of NCO groups. Often, a small excess of blocking agent is expedient in order to ensure complete reaction of all the isocyanate groups. The excess is generally not more than 20 mol.%, preferably not more than 15 mol.% and 30 in particular not more than 10 mol.%, with respect to the isocyanate groups. 9 Le A 33 696-Foreign Countries 9 The blocking reaction is preferably performed with the additional use of catalysts known per se from polyurethane chemistry such as, for example, organometallic compounds such as tin(II) octoate, dibutyltin(II) diacetate, dibutyltin(II) dilaurate or +ertiary amines such as triethylamine or diazabicyclooctane. The blocking reaction 5 ;an optionally be performed in the presence of inert solvents or lacquer solvents such as, for example, ethyl acetate, butyl acetate, methoxypropyl acetate, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, aromatic or (cyclo) aliphatic hydrocarbon mixtures or any mixture of these types of solvents. These conversions are preferably performed in a solvent-free manner. 10 Part B) for preparing the urea group-containing amine hardener mixture according to the invention quite generally consists of polyamines which may optionally also contain secondary amine groups. 15 Polyamines which contain at least two primary amine groups per molecule are preferably used. Particularly preferably, polyamines which contain at least two primary amine groups per molecule and have a (mean) molecular weight of 60 to 500 are used. Suitable 20 compounds are, for example, ethylene diamine, 1,2- and 1,3-diaminopropane, 1,4- diaminobutane, 1,6-diaminohexane, 2,2,4- and/or 2,4,4-trimethylhexamethylene diamine, the isomeric xylylene diamines, 1,4-diaminocyclohexane, 4,4'-diamino-dicyclohexylmethane, 1,3-diaminocyclopentane, 4,4'-diaminodicyclo-hexyl-sulfone, 4,4'-diaminodicylohexylpropane-l ,3, 4,4'-diaminodicyclo-hexylpropane-2;2, 3,3'- 25 dimethyl-4,4'-diaminodicyclohexylmethane, 3-aminomethyl-3,3,5-trimethyl-cyco- hexylamine (isophorone diamine), 3(4)-aminomethyl-l-methylcyclohexylamine or technical grade bisaminomethyltricyclodecane, such as is sold under the name TCD-Diamin® by Hoechst AG or also those polyamines which contain secondary amine groups in addition to at least two primary amine groups such as for example 30 diethylene triamine or triethylene tetramine. 10 Le A 33 696-Foreign Countries Quite specifically preferred is the use of polyamines, in particular diamines with molecular weights in the range mentioned above, which contain one or more cyclo-aliphatic rings. These include, for example, 1,4-diaminooyclohexane, 4,4'-diamino-dicyclohexylmethane, 1,3-diaminocyclopentane, 4,4'-diamino-dicyclohexyl-sulfone, 5 4,4'-diaminodicyclohexylpropane-l,3, 4,4'-diaminodicyclo-hexylpropane-2,2, 3,3'- dimethyl-4,4'-diaminodicyclohexylmethane, 3-aminomethyl-3,3,5-trimethyl-cyclo-hexylamine (isophorone diamine), 3(4)-aminomethyl-l-methylcyclohexylamine or technical grade bisaminomethyltricyclodecane. 10 Adducts which are prepared by reacting an excess of the polyamines mentioned with epoxide resins of the type mentioned below can also be used as part B). Furthermore, polyethearamines which are prepared by reacting polyetherpolyols with ammonia and are sold, for example, by Huntsman under the tradename Jeffamin® can 15 also be used as part B). Furthermore, polyamide resins are also suitable as part B). These types of polyamide resins, which mclude polyaminoamides and polyaminoimidazolines, are sold, inter alia, by Henkel under the tradename "Versamid®". 20 Obviously, it is also possible to use mixtures of the polyamines mentioned as part B). The urea group-containing amine hardener mixtures according, to the invention are prepared by reacting component (A) with component (B) at temperatures up to 25 200°C, preferably at temperatures of 10°C to 200°C, in particular at temperatures of 40°C to 150°C and quite specifically at temperatures of 50°C to 100°C. The reaction may optionally be catalysed. Suitable catalysts are preferably com pounds which contain basic nitrogen atoms. Tertiary amines, Mannich bases and 30 amidines may be mentioned as suitable. 11 Le A 33 696-Foreign Countries Urea group-containing amine hardener mixtures according to the invention are prepared by adding part A) and part B) in amounts such that the ratio by equivalents of amine groups to blocked isocyanate groups is 2:1 to 50:1, preferably 3.5:1 to 25:1, in particular 5:1 to 15:1. 5 Urea group-containing amine hardener mixtures according to the invention may be prepared, if required, in conventional lacquer solvents of the type mentioned above. Preparation is preferably performed, however, in a solvent-free manner. 10 Urea group-containing amine hardener mixtures according to the invention may be prepared in a separate reactor from that used for the synthesis of A), but are preferably prepared immediately following the synthesis of A), in the same reactor. Hardener mixtures according to the invention are liquid compounds with a H 15 equivalent of 20 to 10,000, preferably 40 to 3,000 and in particular 50 to 500. They are preferably suitable as a hardener in combination with the epoxide resins conventionally used in plastics and coating technology, optionally in combination with the catalysts, auxiliary substances and additives conventionally used in plastics and coating technology, to produce coatings, adhesives, sealants, embedding 20 compounds or moulded parts. Epoxide resins conventionally used in plastics and coating technology are oxirane group-containing compounds which contain on average more than one epoxide group per molecule. Examples of suitable epoxide resins are glycidyl ethers of polyhydric 25 alcohols, such as e.g. butanediol, hexanediol, glycerol, TMP, hydrogenated diphenylolpropane or polyhydric phenols such as e.g. resorcinol, diphenylolpropane-2,2 (bisphenol A), diphenylolmethane (bisphenol F) or phenol/aldehyde condensates. Glycidyl esters of polybasic carboxylic acids, such as hexahydrophthalic acid or dimerised fatty acids may also be used. 30 12 Le A 33 696-Foreign Countries -^ The use of liquid epoxide resins based on epichlorhydrin and diphenylolpropane-2,2 (bisphenol A) or diphenylolmethane (bisphenol F) or their mixtures is particularly preferred. If desired, the viscosity of the mixtures may be reduced with mono-functional epoxide compounds, which means that processing is improved. Examples 5 of these are aliphatic and aromatic glycidyl ethers such as butyl glycidyl ether, phenyl glycidyl ether or glycidyl esters such as glycidyl versatate or epoxides such as styrene oxide or 1,2-epoxydodecahe. In the urea group-containing amine hardener mixtures according to the invention, the 10 H equivalent of the hardener and the oxirane group equivalent of the epoxide resin are preferably present in a ratio of 0.8:1 to 1.4:1, in particular in a ratio of 0.9:1 to 1.2:1 and quite specifically in aratio of 0.95:1 to 1.1:1. To prepare coatings, adhesives, sealants, embedding compounds or moulded items, 15 auxiliary agents and additives conventionally used in plastics and coating technology such as, for example,. fillers, solvents, flow control agents, pigments, reaction accelerators or viscosity regulators may optionally be incorporated into the mixture of urea group-containing amine hardener mixture and epoxide resin. Reaction accelerators such as salicylic acid, bis-(dimethylaminomethyl)-phenol or tris-(dimethyl 20 amino-methyl)-phenol, fillers such as sands, crushed rocks, silicas, asbestos dust, kaolin, talcum, metal powders, tar, tar pitch, asphalt, scrap cork, polyamides, plasticisers such as for example phthalates or other viscosity regulators such as for example benzyl alcohol may be mentioned by way of example. 25 Cured plastics based on the urea group-containing amine hardener mixtures according to the invention and epoxide resins are characterised, in contrast to the prior art, by long-term elastification with a surprisingly favourable ratio between plasticity on the one hand and elasticity on the other hand. 30 The coatings, adhesives, sealants, embedding compounds or moulded articles based on the urea group-containing amine hardener mixtures according to the invention and 13 Le A 33 696-Foreign Countries -^ epoxide resins are particularly highly suitable for all applications where good adhesion, resistance to chemicals, and high impact strength and impact resistance, associated with good flexibility and elasticity, are required over the long term. 5 Systems according to the invention are particularly highly suitable as corrosion prevention coatings. In particular when subjected to aggressive media, such as for example in. the case of ballast tanks, the systems are characterised by good wet adhesion and good adhesion under cathode protection conditions. 10 Depending on the range of requirements, the properties of the urea group-containing amine hardener mixtures can be adjusted. If particularly flexible and elastic materials are required, the urea group-containing amine hardener mixture according to the invention is prepared from a large amount of part A) and a small amount of part B). If highly cross-linked, materials which are resistant to chemicals are required, the 15 urea group-containing amine hardener mixture according to the invention is made up from a small proportion of part A) and a large proportion of part B). 14 Le A 33 696-Foreign Countries Examples All percentage data, unless stated otherwise, refers to weight. Long-term stress was simulated by 18 h annealing at 100°C. 5 Viscosity measurements were performed with a cone and plate viscometer, model SM/KP/LC, from PHYSICA. I Preparing part A according to the invention Example 1 381.3 g of a polyetherpolyol with a functionality of 2.6 and an OH value of 43, prepared by simultaneous ethoxylation and propoxylation (EO/PO ratio = 2:8) of a 15 2:1 mixture of propylene glycol and glycerol, and 845.6 g of a polyetherdiol with an OH value of 29, prepared by propoxylation of propylene glycol followed by ethoxylation (EP/PO ratio = 2:8), are prepolymerised, after adding 0.07 g of 2-chloropropionic acid, with 126.8 g of 2,4-diisocyanatotoluene at 60-65°C until the theoretical NCO content of 2.3 % is achieved. 20 Then 645.9 g of a commercially available hydrocarbon resin with an OH content of 1.8 % (Necires EPX L2, commercial product from Nevcin Polymers B.V., Uithoom, Holland) are added, the reaction is catalysed with 0.4 g of tin(II) octoate and the mixture is stirred at 70 - 80°C until the NCO content is less than 0.2 %. 25 Blocked NCO content: 1.5 % Viscosity (23°C): 24400 mPas 15 Le A 33 696-Foreign Countries Example 2 425.0 g of a polyesterdiol with an OH value of 66, prepared by esterification of hexanediol-1,6 and neopentyl glycol in the molar ratio of 1:1 with adipic acid, 500.0 5 g of a polyetherdiol with an OH value of 56, prepared by mixed propoxylation and ethoxylation of propylene glycol (PO/EO ratio = 50:50), and 4.5 g of trimethylol-propane are prepolymerised, after the addition of 0.06 g of 2-chloropropionic acid, with 174.0 g of 2,4-diisocyanatotoluene at 60 - 65°C until the theoretical NCO content of 3.4 % is achieved. 10 15, Then 741.2 g of a commercially available HC resin with an OH content of 1.9 % (Novares LA 300, commercial product of VFT AG, Duisburg) are added, the reaction is catalysed with 0.37 g of tin(II) octoate and the mixture is stirred at 70 - 80°C until the NCO content is less than 0.2 %. Blocked NCO content: 1.8 % Viscosity (23°C): 119000 rnPas II Preparation of urea group-containing amine hardener mixture according 20^ to the invention Example 3 169.4 g of the blocked polyisocyanate from example 1 and 130.6 g of isophorone 25 diamine are stirred for 4 h at 80°C. Viscosity (23°C): 1650 mPas. 16 Le A 33 696-Foreign Countries Example 4 183.0 g of the blocked polyisocyanate from example 1 and 117.0 g of a commercially available polyamine-adduct hardener based on isophorone diamine/ epoxide resin 5 with an amine value of 6.5 eq./kg (hardener HY 847 , commercial product from Ciba Specialty Chemicals) are stirred for 4 h at 80°C. Viscosity (23 °C): 12700 mPas 10 Example 5 15 161.2 g of the blocked polyisocyanate from example 1 and 138.8 g of a commercially available polyaminoamide hardener with an H-active equivalent weight of about 95 (Euredur® 250, commercial product from Ciba Specialty Chemicals) are stirred for 4 h at 80°C. 20 Viscosity (23°C): 9800 mPas Example 6 168.8 g of the blocked polyisocyanate from example 2 and 131.2 g of isophorone diamine are stirred for 4 h at 80°C. Viscosity (23°C): 3310 mPas 25 17 Le A 33 696-Foreign Countries Example 7 181.0 g of the blocked polyisocyanate from example 2 and 119.0 g of a commercially available polyarriine-adduct hardener based on isophorone diamine/epoxide resin 5 with an amine value of 6.5 eq./kg (hardener HY®, commercial product from Ciba Specialty Chemicals) are stirred for 4 h at 80°C. Viscosity (23°C): 21400 mPas 10 Example 8 160.6 g of the blocked polyisocyanate from example 2 and 139.4 g of a commercially available polyaminoamide hardener with an H-active equivalent weight of about 95 (Euredur® 250, commercial product from Ciba Specialty Chemicals) are stirred for 4 15 h at 80°C. Viscosity (23°C): 17300 mPas Example 9 20 190.6 g of a polyetherpolyol with a functionality of 2.6 and an OH value of 43, prepared by simultaneous ethoxylation and propoxylation (EO/PO ratio = 2:8) of a 2:1 mixture of propylene glycol and glycerol, and 422.8 g of a polyetherdiol with an OH value of 29, prepared by propoxylation of propylene glycol followed by 25 ethoxylation (EO/PO ratio = 2:8), are prepolymerised, after adding 0.03 g of 2-chloropropionic acid, with 63.4 g of 2,4-diisocyanatotoluene at 60 - 65°C until the theoretical NCO content of 2.3 % is achieved. Then 322.9 g of a commercially available hydrocarbon resin with an OH content of 30 1.8 % (Necires® EPX L2, commercial product from Nevcin Polymers B.V., 18- Le A 33 696-Foreign Countries 18 Uithoorn, Holland) are added, the reaction is catalysed with 0.2 g of tin(II) octoate and the mixture is stirred at 70 - 80°C until the NCO content is less than 0.2 %. Then 770.6 g of isophorone diamine are added and the mixture is stirred for 4 h at 5 80°C. Viscosity (23°C): 1520 mPas III Application examples 10 Use of urea group-containing amine hardener mixtures in combination with an epoxide resin conventionally used in plastics and coatings technology 15 20/ Example 10 35.4 g of the adduct from example 3 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 25 minutes. Initial viscosity (23°C): 13,200 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm 25 Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 7.5 mm 19 Le A 33 696-Foreign Countries *4$- Example 11 33.0 g of the adduct from example 4 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The 5 mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 25 minutes. 10 Initial viscosity (23°C): 14,300 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520):' > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 9.0 mm 15 20 Example 12 37.2 g of the adduct from example 5 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 30 minutes. Initial viscosity (23°C): 9,700mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm 25 Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): > 9.0 mm 20 Le A 33 696-Foreign Countries 2j>^ Example 13 35.5 g of the adduct from example 6 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The 5 mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 15 minutes. 10 Initial viscosity (23°C): 27,400 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 7.5 mm 15 20 25 Example 14 33.2 g of the adduct from example 7 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 20 minutes. Initial viscosity (23°C): 19,800 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): > 8.5 mm 21 Le A 33 696-Foreign Countries Example 15 37.4 g of the adduct from example 8 are. intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The 5 mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 35 minutes. 10 Initial viscosity (23°C): 13,400 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): > 9.0 mm 15. 20 Example 16 35.4 g of the adduct from example 9 are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 25 minutes. Initial viscosity (23°C): 13,000 mPa.s ' Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm 25 Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 7.5 mm 22 Le A 33 696-Foreign Countries IV Examples not in accordance with the invention, as a comparison Example 17 5 946.6 g of a polyetherpolyol with a functionality of 2.6 and an OH value of 43, prepared by simultaneous ethoxylation and propoxylation (EO/PO ratio = 2:8) of a 2:1 mixture of propylene glycol and glycerol, are prepolymerised, after the addition of 0.04 g of 2-chloropropionic acid, with 125.9 g of 2,4-diisocyanatotoluene for 5 hours at 80° until the theoretical NCO content of 2.8 % is achieved. 10 15 20 Then 177.3 g of a technical grade nonylphenol isomer mixture is added. After catalysis with 0.14 g of tin(II) octoate, stirring is continued for 10 hours at 60°C until the NCO content is less than 0.2 %. Blocked NCO content: 2.45 % Viscosity (23 °C): 106000 mPa.s 214.8 g of the blocked polyisocyanate and 85.2 g of isophorone diamine are stirred for 4 h at 80°C. Viscosity (23°C): 87000 mPa.s 27!9 g of the adduct are intimately mixed with 30.0 g of a standard epoxide resin (Epikote® 828 from Shell, epoxide equivalent weight 190). The mixture is applied to 25 a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 15 minutes. Initial viscosity (23°C): 50,600 mPa.s 30 Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 5.5 mm 23 Le A 33 696-Foreign Countries 23- Example 18 28.8 g of the epoxide group-containing resin Rutapox VE 3318 and 15.6 g of the 5 amine group-containing hardener Riitadur® H 550 (both products of Bakelite AG) are intimately mixed with 12.0 g of the hydrocarbon resin Novares® LA 700 with a hydroxyl group content of 2.25 % (commercial product from VFT AG, Duisburg). The mixture is applied to a metal sheet in a 0.1 mm thick layer. Curing takes place at room temperature. The processing time (initial viscosity is doubled) is 15 minutes. 10 Initial viscosity (23°C): 769 mPa.s Erichsen indentation after storage for 14 days at RT (DIN ISO 1520): > 9.0 mm Erichsen indentation after annealing for 18 h at 100°C (DIN ISO 1520): 3.0 mm 24 We claim: 1. A process for preparing urea group-containing amine hardener mixtures by reacting (A) a polyisocyanate componet, consisting of at least one organic poly-isocyanate, in which at least 95 mol.% of the NCO groups are reversibly blocked by reaction with at least one phenolic group-containing hydrocarbon resin with a concentration of hydroxyl groups, calculated as OH, molecular weight = 17, of 0.1% to 10.0% with (B) at least one organic polyamine in a ratio by equivalents of amine groups to blocked NCO groups of 2:1 to 50:1 at temperatures up to 200°C. 2. A process for preparing urea group-containing amine hardener mixtures as claimed in claim 1, wherein the reaction is performed to temperatures of 50 to 100°C. Dated this the 23rd day of January, 200 (RAN.JNA MEHTA-DUTT) Of Remfry & Sagar Attorney for the Applicants 25

Documents:

in-pct-2002-00085-mum-abstract(complete)-(23-1-2002).pdf

in-pct-2002-00085-mum-cancelled pages(13-7-2005).pdf

in-pct-2002-00085-mum-claims(complete)-(23-1-2002).pdf

in-pct-2002-00085-mum-claims(granted)-(22-2-2008).pdf

in-pct-2002-00085-mum-claims.doc

in-pct-2002-00085-mum-claims.pdf

in-pct-2002-00085-mum-correspondence(7-8-2007).pdf

in-pct-2002-00085-mum-correspondence(ipo)-(15-4-2008).pdf

in-pct-2002-00085-mum-correspondence-others.pdf

in-pct-2002-00085-mum-correspondence-received-ver-13072005.pdf

in-pct-2002-00085-mum-correspondence-received-ver-14062004.pdf

in-pct-2002-00085-mum-correspondence-received-ver-22022002.pdf

in-pct-2002-00085-mum-correspondence-received-ver-23012002.pdf

in-pct-2002-00085-mum-description (complete).pdf

in-pct-2002-00085-mum-description(complete)-(23-1-2002).pdf

in-pct-2002-00085-mum-description(granted)-(22-2-2008).pdf

in-pct-2002-00085-mum-form 1(13-7-2005).pdf

in-pct-2002-00085-mum-form 1(7-8-2007).pdf

in-pct-2002-00085-mum-form 13(7-8-2007).pdf

in-pct-2002-00085-mum-form 2(granted)-(22-2-2008).pdf

in-pct-2002-00085-mum-form 2(title page)-(granted)-(22-2-2008).pdf

in-pct-2002-00085-mum-form 3(13-7-2005).pdf

in-pct-2002-00085-mum-form 3(23-1-2002).pdf

in-pct-2002-00085-mum-form-1.pdf

in-pct-2002-00085-mum-form-19.pdf

in-pct-2002-00085-mum-form-2.doc

in-pct-2002-00085-mum-form-2.pdf

in-pct-2002-00085-mum-form-26.pdf

in-pct-2002-00085-mum-form-3.pdf

in-pct-2002-00085-mum-form-5.pdf

in-pct-2002-00085-mum-form-pct-ib-304.pdf

in-pct-2002-00085-mum-form-pct-ipea-409.pdf

in-pct-2002-00085-mum-general power of authority(23-1-2002).pdf

in-pct-2002-00085-mum-petition under rule 137(13-7-2005).pdf

in-pct-2002-00085-mum-power of authority(13-7-2005).pdf

in-pct-2002-00085-mum-specification(amended)-(13-7-2005).pdf