Title of Invention

DISPERSE DYE MIXTURES

Abstract . A dye mixture comprising (A) at least one pyrroline type dye of the formula (I) wherein R1 is H, C1-20alkyl or C2-2oalkenyl; and D is aryl; and (B) at least one anthraquinone type dye of the formula (II) wherein RB is (CH2)nORB1; RB1 is C1-6alkyl or C1-6alkoxy-C1-6alkyl; n is 1-6; and ZB is 0 or NH
Full Text FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13] "DISPERSE DYE MIXTURES"
BASF AKTIENGESELLSCHAFT, a German company, of D-67056 Ludwigshafen, Germany,
The following specification particularly describes the invention and the manner in which it is to be performed:

This invention relates to mixtures of disperse dyes, compositions comprising dispersions of such mixtures and processes for the colouration of synthetic materials with such mixtures. More particularly, the invention relates to mixtures of the dyes of the so-called pyrroline type with those of the so-called anthraquinone type.
Dyes of the pyrroline type are disclosed, for example, in US-A-3013013, US-A-3013018, GB-A-2191498, EP-A-0327077, EP-A-0511625 and WO-A-94010248. .
In particular, WO-A-94010248 discloses dyes of the pyrroline type having the formula (1)

Formula (1)
wherein:
Formula (2)
D is a group of Formula (2):


or a group of Formula (3) :
Formula (3)
or a group of Formula (4) :


Formula 4
R1 is alkyl, cycloalkyl, aryl, alkenyl or. aralkyl each of which may be optionally substituted;
R2 is optionally substituted C7_20-alkyl; or R1 and R2 together with the nitrogen atom to which they are attached form a pyrrolidine or piperidino ring;
R3 is alkyl, alkenyl or aralkyl each of which may be optionally substituted, ,-S02alkyl, -S02aryl, or -COR in which R is -H or alkyl, phenyl, cycloalkyl or aralkyl each of which may be optionally substituted, or -H; and
R4 is an electron withdrawing group;
R6 is optionally substituted C1_16-alkyl; or R1 and Rs together with the nitrogen atom to which they

are attached form a pyrrolidino or piperidino
ring; R7, R8, R9 and R10 each independently is alkyl, cycloaklyl, aryl, alkenyl or aralkyl, each of which may be optionally substituted or -H; W is oxygen or sulphur; Z is a direct link or N-R11 in which R11 is -H or
optionally substituted alkyl or aryl; Ring A is unsubstituted apart from the -NR1R2 group
or is substituted by from 1 to 4 further
groups; and Ring B is unsubstituted or substituted by from 1 to
3 groups; except for 3-(4-(N,N~di-n-
octylamino)phenyl) -4-cyano-5-dicyano
methylidene-2-oxo-2,5-dihydropyrrole provided that:
(a) when D is a group of Formula (3), R1 and R6 are different and R1 is not -C2H5/ ~ C3H7 or -C4H9 when R6 is -C2H4phenyl, -C3Hsphenyl and ethyl substituted by -OH, -CN, -OCH3/ -OC2H4OC2H5, -NHCOCH3 -Ophenyl and -NHS02CH3;
(b) at least one of R1 and Rs is branched chain alkyl.
where RA is H (Kayalon Polyester Brilliant Blue F2B-S); or CH2CH=CH2 (Kayalon Polyester Blue-Green FG-S); and
Commercially available dyes of the pyrroline type are, for example, dyes of the formula:


dyes of the formula

where XA is C4H9 and YA is CH(CH3)CsH:11
Dyes of the anthraquinone type are also well -known. For example, dyes and mixtures_of dyes each within the formula given below are commercially available as C.I. Disperse Blue 60 type dyes:

where RB is (CH2)n -O-RB1, in which n is 1-6 and RB1 is straight or branched alkyl or alkoxy (and examples of RB are_C2H40CH3, C3Hs0CH3/ C3H6OC2Hs and C3H6OC2H4OCH3 ) and Za is 0 or NH.
However, if dyes of the pyrroline type alone (or mixtures of such pyrroline-type dyes) are dyed on polyester, build up to heavy depths of shade is difficult to achieve, light fastness is average at

best, the dyes tend to be rather sensitive to changes
in the pH of dyeing and undesirable redder shades are
sometimes seen.
If dyes of the anthraquinone type alone (or mixtures of such anthraquinone-type dyes) are dyed on polyester, they often exhibit very good light fastness, but with poor build up. Moreover, they are. tinctorially very weak and therefore expensive for colouring polyester. Moreover, high strength liquid or grain formulations cannot be achieved. In addition, although good build up can be achieved, the shade becomes duller as the dye builds up.
We have now found surprisingly that if certain dyes of the pyrroline type are .mixed with certain dyes, of the anthraquinone type, brighter shades are maintained as the dyes build up. Moreover, the dyeings have good light fastness. In particular, as compared with anthraquinone dyes alone, when using mixtures with pyrroline dyes, products of high colour strength can be readily formulated, with greater cost-effectiveness.
Thus the invention provides a dye mixture comprising
(A) at least one pyrroline type dye of the formula
(I);


wherein R1 is H, q1-12alkyl or C2_20alkenyl; and D is aryl; and
(B) at least one anthraquinone type dye of the formula (II)

wherein RB is (CE2)aOR^-;
Rg1 is a straight or branched chain C1-6 -galkyl or C1-6alkoxy-C1-6alkyl;
n is 1-6; and
ZB is 0 or NH.
Component (A) preferably comprises a dye of the formula (I) wherein D is a group of the formula (a)

wherein each of R2 and R3 independently is an alkyl, cycloalkyl, aryl, alkenyl or aralkyl group.
In the above formula (I), the alkyl group represented by any of R1 - R3 is preferably a C1-20alkyl, more preferably a C1-12-alkyl and especially a C1-8-alkyl group. The cycloalkyl group represented by

R2 or R3 is preferably a C1-9-cycloalkyl and more preferably a cyclohexyl group. The aryl group represented by R2 or R3 is preferably phenyl. The alkenyl group represented by any of R1 - R3 is preferably a C2_10-alkenyl, more preferably a C2-6-alkenyl and especially a C2-3-alkenyl group, such as allyl. The aralkyi group represented by any of R1 - R3 is preferably a phenyl-C1-6-alkyl, more preferably a phenyl-C1-3-alkyl, especially phenylethyl or 3-phenylpropyl.
The alkyl group represented by R3 is more preferably a C7_l5-alkyl, still more preferably a C7_12-alkyl and especially a C7_9-alkyl group.
The alkyl group represented by R1_ is more preferably a C1_6-alkyl and still more preferably C1_4-alkyl group.
R1 is especially preferably -H, C1-4-alkyl or C2_3alkenyl, more preferably -H or C1-4-alkyl and especially -H.
D is preferably a group of Formula (a) .
The alkyl groups represented by any of Rl - R3 may be straight or branched chain alkyl groups. R2 is preferably C1-12-alkyl more preferably C1-8-alkyl especially unsubstituted C1-6alky!. R3 may be C7_12-alkyl and preferably C7_3-alkyl, especially unsubstituted C7_9-alkyl or may be unsubstituted C1-6-alkyl. Where D is a group of Formula (a) it is preferred that one or both of R2 and R3 is branched, more preferably branched at an α- or β-, i.e. 1- or 2~, position. It is preferred that R2 and R3 are different. It is also preferred that ring A is unsubstituted anart from the

NR2R3 group.
A preferred sub-group of dyes of Formula (I) is that in which D is a group of Formula (a): R1 is alkyl or -H; R2 is alkyl; R3 is C7_20-alkyl; and Ring A is unsubstituted apart from the -NR2R3
group.
Another preferred sub-group of dyes of Formula (I) is that in which D is a group of the Formula (a);
R1 is -H or alkyl;
R2 is unsubstituted C1-8-alkyl;
R3 is unsubstituted C1-6-alkyl; and
Ring A is -unsubstituted apart from the -NR2R3
group; and
R2 and R3 are different or at least one of R2 and
R3 is a branched chain alkyl.
An especially preferred sub-group of dyes of Formula (I) is that in which D is a group of Formula
(a) :
R1 is -H;
R2 is unsubstituted C1-8 alkyl;
R3 is unsubstituted C7_9 alkyl; and
Ring A is unsubstituted apart from the -NR2R3
group.
A further especially preferred sub-group of dyes of Formula (I) is that in which D is a group of Formula
(a) ;
R1 is -H;
R2 is n-propyl or n-butyl;
R3 is 1-methylhexyl or 2-ethylhexyl; and

Ring A is unsubstituted apart from the -NR2R3 group.
Typical especially preferred components (A) in mixtures embodying the invention are:
(1) a pyrroline type dye of the formula (I), wherein R1 is H, R2 is C,H9 and R3 is 1-methyl-n-hexyl (A1) or a mixture thereof with up to 10% by weight of component (A), of a pyrroline type dye (A2) of the formula (I), wherein R1 is H and each of R2 and R3 is C4H9;
. (2) a pyrroline type dye of the formula (I), wherein R1 is H, R2 is ethyl and R3 is n-octyl (A3) or 2-ethyl-n-hexyl (A4) or a mixture of dyes (A3) and (A4) ; and
(3) a pyrroline type dye of the formula (I), wherein R2 is C4H9/ R3 is^-phenylpropyl and R1 is H (As) or allyl (As) or a mixture of dyes (A5) and {A6} .
When R1 is H, dyes of Formula (I) may exist in a tautomeric form represented by Formula (IA) :

Formula (IA)
wherein:
D is as hereinbefore defined.
The dyes of Formula (I) where D is a group of Formula (a) may be prepared by reaction of an aniline of Formula (III):


Formula (III)
in which Ring A is as hereinbefore defined, firstly with a compound of Formula R2X in which R2 is as hereinbefore defined and X is a halogen such as -C1, -Br or -I or other leaving group, such as a tosylate, mesylate or alkylsulphonate in the presence of a base such as an alkali metal carbonate or alkaline earth metal-carbonate such as K,C03 or CaC03 and secondly with a compound of formula, R3X in which R3 and X are as hereinbefore defined in the presence of a base as above to form an aromatic amine of Formula (IV);

Formula (IV)
Alternatively the aromatic amine of the Formula (IV) may be prepared by reductive alkylation of the aniline of Formula (III) with an appropriate ketone or aldehyde. The reductive alkylation may be performed in an inert liquid medium such as an alcohol or ester optionally in the presence of an acid such as an aliphatic carboxylic acid, for example, acetic and propionic acids and aromatic sulphonic acid e.g. 4-

toluenesulphonic acid using a metal or supported metal catalyst such as palladium or platinum, on carbon and hydrogen, optionally at elevated temperature and pressure. Alternatively, reducing agents such as sodium borohydride may be used. After the reductive alkylation a second alkyl group may be introduced as described above.
The aromatic amine of Formula (IV) is then reacted with a 3-halopyrrole of Formula (V):

Formula (V)
in which R1 is as hereinbefore defined and X is preferably a halogen such as -CI or -Br to. form a compound of Formula (I). The reaction may be performed in a liquid medium such as N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulphoxide, sulpholane, N-methylpyrrolidone, acetonitrile, toluene or tetrahydrofuran or any mixture thereof and at a temperature from -20°C to 50°C. The product may be isolated by any convenient means such as pouring the reaction mixture into a mixture of ice and water and recovering the precipitated product by filtration. The product may be purified by any convenient means such as trituration or recrystallisation from organic liquids particularly alkanols such as methanol, ethanol and esters such as ethylacetate or mixtures thereof.
The 3-halo-2-oxopyrrole of Formula (V) maybe

prepared by halogenation of a compound which may be represented by Formulae (VI), (VI1) and (VI2)

with a halogenatitig agent such as phosphorus oxychloride, phosphorus trichloride, phosphorus pentachloride, thionyl chloride or phosgene at a temperature of from ~20°C to 50°C in a liguid medium such as N,N-dimethylformamide, N,N-diethylacetamide, dimethylsulphoxide, suipholane, N-methylpyrrolidone, acetonitrile or tetrahydrofuran. The product may be used without isolation with improvement in yield in the preparation of compounds of Formula (1) described above or may be isolated by evaporating the liguid medium.
Alternatively a compound of Formula (IV) may be reacted directly with the compound represented by Formulae (VI), (VI1) or (VI2) in a liguid medium such as toluene in the presence of a halogenating agent such as phosphorus oxychloride.
The compounds represented by Formulae (VI) or (VI1) my be prepared by reaction of diethyloxalate with a compound for Formula (VII);


in the presence of a base such as an alkali metal alkoxide preferably a sodium or potassium C^-alkoxide and especially sodium or potassium methoxide, ethoxide, n- or iso-propoxide, n-, iso- or tertiary-butoxide in a liquid medium, preferably an alkanol such as methanol, ethanol, n- or iso-propanol or n-, iso- or tertiary-butanol, at a temperature of from 10°C to 60°C. The product may be isolated by cooling the reaction mixture
and collection by filtration.
The compound of Formula (VII) may be prepared by
reaction of malononitrile with a compound of Formula
(VIII) :
NCCHZCN
Formula (VIII)
in the presence of a base such as sodium methoxide in a liquid medium such as methanol at a temperature of from -20°C to 60°C. The product may be isolated by filtration.
A dye of Formula (I) in which R1 is other than -H may be prepared by reaction of the corresponding dye of Formula (I) in which R1 is -H in a liquid medium, preferably an amide such as dimethylformamide or an ether such as tetrahydrofuran or diethylether in the presence of a base, preferably an alkali metal carbonate such as potassium carbonate or an alkali metal hydride such as sodium -hydride at a-temperature of 0°C to 120°C with an appropriate alkylating agent. Where R1 is alkyl an appropriate alkylating agent is an alkyl halide, preferably an alkyl iodide, bromide or chloride. Where R1 is alkenyl an appropriate alkylating agent is an alkenyl halide, preferably an alkenyl bromide. These dyes may be isolated by

evaporating the liquid medium or by filtration from the reaction mixture.
As previously mentioned, component (A) may be a mixture of two or more dyes of Formula (I) wherein R1 to R3 inclusive, D and Ring A are as hereinbefore defined.
Reference is now made to component (B), which preferably comprises at least one anthraquinone type dye of the formula (II), wherein ZB is O or NH, more preferably 0, n is 1, 2 or 3, more preferably 2 or 3 and Ra1 is methyl, ethyl or methoxyethyl. Thus, it is especially preferred that component (B) is an anthraquinone dye of the formula (II) wherein ZB is 0 and RB is C2H4OCH3, C3HsOCH3, C3H60C2H5 or C3H6OC2H4OCH3 or a mixture of any two or more such anthraquinone type dyes, especially a mixture of any two, or- all three, of the dyes (B1), (B2) and B3), each of the Formula (II) in which ZB is 0,
which dye . (B1) is a dye wherein RB is C3HsOCH3.
which dye (B2) is a dye wherein RB is C3H6OC2H4OCH3; and
which dye (B3) is a dye wherein R5 is C3H4OC2H5.
When component (B) is a mixture of dyes (B1) and (Bz), the ratio by weight of dye (B1) : dye (B2) is preferably from 30:70 to 60:90 inclusive, more preferably from 45:55 to 48:52.
The dyes of the formula (II) wherein RB is hydrogen may be prepared, for example, by reaction of 2,3-dicyano-l,4-diamino~anthraquinone with sulphuric acid. This dye may then be reacted with a primary amine RBXNH2 to obtain a dye of the formula (II) wherein RBX is any of the groups of RB other than hydrogen. Alternatively, certain of such dyes of the formula (II) may be prepared from the 2,3-dicyano-l,4-

diaminoanthraquinone by reaction with each of sulphuric acid and a secondary alcohol to provide a dye wherein RBX is secondary alkyl. Another method of preparing dyes of the formula (II) where RB is a group as previously defined other than hydrogen is by reaction of the corresponding 1,4-diaminoanthraquinone carboxylic anhydride with a primary amine RBXNH2 where RBX is as defined above. Such reactions are disclosed in Ventkataraman, The Chemistry of Synthetic Dyes, Academic Press, New York and London, 1970, Vol- III,
pages 413-415.
In general, in. a preferred mixture of components (A) and (B), the ratio by weight, of component (A) : component (B) is from 3:97 to 60:40 inclusive, more preferably from 8:92 to 40 : 60 inclusive, especially
from 10:90 to 30:70 inclusive.-
In especially preferred mixtures of components (A)
and (B), component (A) is
(1) a pyrroline type dye of the formula (I), wherein R1 is H, R2 is C4H9 and R3 is 1-methyl-n-hexyl (A1) or a mixture thereof with up to 10% by weight of component (A), of a pyrroline type dye (A2) of the formula (I), wherein R1 is H and each of R2 and R3 is
C4H9; or
(2) a pyrroline type dye of the formula (I),
wherein R1 is H, R2 is ethyl and R3 is n-octyl (A3) or
2-ethyl-n-hexyl (A4) or a mixture of dyes (A3) and (A4);
or
(3) a .pyrroline type dye of the formula. (I),
wherein R2 is C4H9, R3 is 3-phenylpropyl and R1 is H (A5)
or allyl (As) or a mixture of dyes (A5) and (A6); and
component (B) is a mixture of anthraquinone-type dyes (B1) and (B2), each of the formula (II), which dye (B1) is a dye wherein ZB is O and.RB is C3H6OCH3 and which dye (B2) is a dye wherein Z is O and RB is

C3HsOCH2CH2OCH3, wherein the ratio, by weight, of the dye (B1) : dye (Bz) is preferably from 45 : 55 to 48 : 52.
At least for a mixture of component A(l), with component (B), the ratio, by weight, of component A(l) : component (B) is preferably from 5 : 90 to 30 : 70 inclusive.
A mixture embodying the invention of at least one dye of formula (I) (component A) and at least one dye of the formula (II) (component B) may additionally comprise at least one other dye (component C), especially a yellow, orange, red or brown dye capable of producing a navy or black shade.
Mixtures embodying the invention can be prepared by a number of methods including
(1) Co-crvstallisation
Typically, the dyes are dissolved in a hot solvent, for example, by placing the dyes in a suitable solvent and heating up to the reflux temperature of the solvent until the dyes are dissolved, thereafter filtering to provide a solution, and then allowing the solution to cool and crystals to form. The resultant mixture may then undergo further processing, such as milling and spray drying. Examples of suitable solvents for this process are organic solvents.such as aromatic hydrocarbons, chlorinated hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, alcohols, amides, sulphoxides, esters, ketones and ethers. Specific examples of organic solvents are toluene, ethyl cellosolve, acetone, chlorobenzene, pyridine, dimethyl formamide, diemthylsulphoxide, ethyl acetate, benzene, tetrahydrofuran and cyclohexane.


(2) Co-milling
(a) The dyes are mixed and then milled together . to give an intimate blend which is then spray dried to give a solid mixture; or
(b) each dye is milled separately and then mixed in the required ratio before spray drying.
(3) Dry Blending
Each dye is spray dried separately, and then mixed in the required ratio by a dry blending process.
The mixtures give especially bright shades which are maintained as the dyes build up. Dyeings with the mixtures have good light fastness. The mixtures have high colour strength and can be readily and cost-effectively formulated.
Mixtures embodying the invention provide especially useful disperse dyes valuable for colouring synthetic textile materials and fiber blends thereof by exhaust dyeing, padding or printing, and may be formed into dispersions for this purpose. They may also be used in, for example, ink jet printing of textiles and non-textiles, dye diffusion, thermal transfer printing and in the colouration of plastics.
According to other aspects, the invention provides a composition comprising at least the dye mixture and a dispersing agent, surfactant or wetting agent, suitable for providing such a dispersion and-also a process for colouring a synthetic textile material or fibre blend thereof which comprises applying to the synthetic textile material or fibre blend a mixture comprising at least one dye of the formula (I) and at least one dye of the formula (II).

The synthetic textile material may be selected from aromatic polyester, especially polyethylene terephthalate, polyamide, especially polyhexamethylene adipamide, secondary cellulose acetate, cellulose triacetate, and natural textile materials, especially cellulosic materials and wool. An especially preferred textile material is an aromatic polyester or fibre blend thereof with fibres of any of the above mentioned textile materials. Especially preferred fibre blends include those of polyester-cellulose, such as polyester-cotton, and polyester-wool. The textile materials or blends thereof may be in the form of filaments, loose fibres, yarn or woven or knitted fabrics.
The mixtures of dyes of formulae "[I] and [II] optionally in conjunction with other disperse dyes may be applied to the synthetic textile materials or fibre blends by processes which are conventionally employed in applying disperse dyes to such materials and fibre blends.
Suitable process conditions may be selected from the following
(i) exhaust dyeing at a pH of from 4 to 6.5, at a temperature of froml25°C to 140°C. for from 10 to 120 minutes and under a pressure of from 1 to 2 bar, a sequestrant optionally being added;
(ii) continuous dyeing at a pH of from 4 to 6.5, at a temperature of from 190°C to 225°C for from 15 seconds to 5 minutes, a migration inhibitor optionally being.added;
;iii) direct printing at a pH of from 4 to 6.5, at

a temperature of from 160°C to 185°C for from 4 to 15 minutes for high temperature steaming, or at a temperature of from 190°C to 225°C for from 15 seconds to 5 minutes for bake fixation with dry heat or at a temperature of from 120°C to 140°C and 1 to 2 bar for from 10 to 45 minutes for pressure steaming, wetting agents and thickeners (such as alginates) of from 5 to 100% by weight of the dye optionally being added; (iv) discharge printing (by padding the dye on to the textile material, drying and overprinting) at a pH of from 4 to 6.5, migration inhibitors and thickeners optionally being added; (v) carrier dyeing at-a PH of from 4 to 6.5, at a temperature of from 95°C to 100°C using a carrier such as methylnaphthalene, - . diphenylamine or 2-phenylphenol, sequestrants optionally being added; and (vi) atmospheric dyeing of acetate, triacetate and nylon at a pH of from 4 to 6.5, at a temperature of 85°C for acetate or at a temperature of 90°C for triacetate and nylon-for from 15 to 90 minutes, sequestrants optionally being added.
In all the above processes, the dye mixture may be applied as a dispersion comprising from 0.001% to 6, preferably from 0.005 to 4%, of the dye mixture m an
aqueous medium.
A particular aspect of the invention provides a composition comprising a mixture of dyes (I) and (II), optionally at least one other disperse dye and, additionally, optionally at least one further

ingredient conventionally used in colouring applications such as a dispersing agent, surfactant or wetting agent. The composition typically comprises from 1% to 65%, preferably 10 to 60%, more preferably 2-0 to 55%, of the total dye mixture in a liquid, preferably an aqueous, or solid medium. Liquid compositions are preferably adjusted to pH 2 to 7, more preferably pH 4 to 6.
Typical examples of dispersing agent are lignosulphonates, naphthalene sulphonic acid/formaldehyde condensates and phenol/cresol/sulphanilic acid/formaldehyde condensates, typical examples of wetting agent are alkyl aryl ethoxylates which may be sulphonated or phosphated and typical examples of other ingredients which may be present are_inorganic salts, de-foamers such as mineral oil or nonanol, organic liquids and buffers. Dispersing agents may be present at from 10% to 200% on the weight of the dye mixtures. Wetting agents may be used at from 0% to 20% on the weight of the dye mixtures.
The compositions may be prepared by bead milling the dye mixture with glass beads or sand in an aqueous medium. The compositions may have further additions of dispersing agents, fillers and other surfacants and may be dried, by a technique such as spray drying, to give a solid composition comprising from 5% to 65% of
dyestuff.
In addition to the above-mentioned application processes, the dye mixtures may be applied to synthetic textile materials and fibre blends by ink-jet printing, the substrates optionally having been pre-treated to aid printing. For ink-jet applications, the application medium may comprise water and a water-soluble organic solvent, preferably in a weight ratio

of 1:99 to 99:1, more preferably 1:95 to 50:50 and especially in the range 10:90 to 40:60. The water-soluble organic solvent preferably comprises a C1-C4-alkanol, especially methanol or ethanol, a ketone, especially acetone or methyl ethyl ketone, 2-pyrrolidone or N-methylpyrrolidone, a glycol, especially ethylene glycol, propylene glycol, trimethylene glycol, butane-2,3-diol, thiodiglycol or diethylene glycol, a glycol ether, especially ethylene glycol monomethyl ether, propylene glycol monomethyl ether or diethylene glycol monomethyl ether, urea, a sulphone, especially bis-(2-hydroxyethyl) sulphone or mixtures thereof.
The dye mixtures may also be applied to textile materials using supercritical carbon dioxide, in which
case the dye—formulating agents may optionally be
omitted.
Embodiments of the present invention will now be described in more detail with reference to the following Examples, in which parts are by weight unless otherwise stated.
Examples 1-2 Preparation for Individual Dyes
Example 1 - Pvrroline-tvpe Dye (1)
Preparation of 3-(4-(N-butyl-N-(1-methylhexvl)amino)phenyl )-
4-cyano-5-dicyanomethvlidene-2'-oxo-2.5-dihydropvrrole
i) A mixture of aniline. (100 parts), 2-heptanone (220 parts), 4-toluene sulphonic acid (6 parts) and 3% palladium on carbon (5 parts) in a 1 litre autoclave was charged with hydrogen to a pressure of 80 atmospheres and heated at 150°C for 40 hours. The cooled reaction mixture was diluted with ethyl acetate, filtered, washed with lN-hydrochloric acid (6 x 200

parts) and water (2x200 parts), the ethyl acetate was separated and dried (MgS04) before evaporating to leave N-(1-methylhexyl)aniline (76 parts,37%). ia) In an alternative procedure, N-(l-
me thy lhexyl) aniline was prepared as follows: To an ice cooled, stirred mixture of aniline (28 parts), heptan-2-one (69 parts) and propionic acid (9 parts) was added sodium borohydride (9.8 parts) portionwise at such a rate as to keep the temperature less than 5°C. The reaction mixture was allowed to warm up to room temperature and stirred overnight. The reaction mixture was then poured into an ice water mixture, and extracted with ethyl acetate. The organic phase was washed with water, 2% hydrochloric acid and water. The dried organic phase was evaporated to leave N-(l-
me±hylhexyl)aniline (53.5 parts, 93%).
ii) A mixture of N-(l-methylhexyl) aniline (76 parts), 1-bromobutane (66 parts), anhydrous potassium carbonate (65 parts) and DMF (150 parts) was stirred while heating under reflux for 41 hours. An additional quantity of 1-bromo butane (44 parts) was added and the mixture stirred while heating under reflux for a further 19 hours. The cooled mixture was poured into water (400 parts) and the organic phase separated. The aqueous phase was extracted with toluene, the organic phases and toluene extract were combined and washed with water (2 x 100 parts) before evaporating to leave N-butyl-N-(l-methylhexyl)aniline (72.8 parts, 44%) which was purified by vacuum distillation to. give N-butyl-N-(l-methylhexyl) aniline b.pt 73-80°C, 2.6 mm Hg. [Dye (1)].
iia) In an alternative procedure, N-butyl-N- (1-methylhexyl)aniline was prepared as follows:
A mixture of N-butylaniline (7.45 parts) anhydrous potassium carbonate (7.5 parts), 2-bromoheptane (13.5

parts) and DMF (25 parts) was stirred at 130°C for 8 6 hours. The reaction mixture was poured into water, saturated with salt and extracted with ethyl acetate. The organic phase was washed with water, dried (MgS04) and evaporated to leave N-butyl~N- (1-methylhexyl)aniline (11.8 parts, approximately 60% strength) . This material had acetic anhydride (10 parts) added to it prior to further use. iii) A stirred mixture of the disodium salt of 4-cyano-5~dicyanomethylidene-3-hydroxy-2-oxo-2,5-dihydropyrrole (23 parts) and dry N,N-dimethylformamide (180 parts) was cooled to -5°C to -10°C and N-n-butyl-N- (1-methylhexyl)aniline containing acetic anhydride (27%, 37 parts) was added followed by the dropwise addition of phosphorous oxychloride (26 parts) whilst maintaining the temperature at less than -5°C. The mixture was allowed to warm to room temperature and stirred for 20 hours. The reaction mixture was poured into a stirred mixture of ice and water (400 parts) and acetone (400 parts) was added before filtering off a solid. The solid was washed repeatedly with warm water (40°C) and then dried at 50°C to yield 3-(4- (N-butyl-N-(1-methy Ihexyl) amino)phenyl) -4-cyano-5-dicyanomethylidene-2-oxo-2,5-dihydropyrrole (26.8 parts, 65%). A small sample of this material was slurried in boiling methanol, collected by filtration, washed with methanol and dried at 50°C to give 3-(4-(N-n-butyl-N- (1-me thy Ihexyl) amino) phenyl) -4-cyano-5-dicyanomethylidene-2-oxo-2, 5-dihydropyrrole m.p. 180°C; λmax (CH2C12) 662nm (e max 60231); M/Z (EI) 415 . (M+, 20%), 400 (15), 372 (12), 344 (100), 288 (33) and 272 (25).
Example 2 - Anthraquinone-tvoe Dve (2)

A dye (2) obtained commercially as C.I. Disperse Blue 60, is a mixture of 13.5 parts by weight Palanil Blue BG-ME and 25 parts by weight Palanil Blue BG-M, which mixture is made up to 100 parts by weight with dispersing agents. The dyes have the following respective structures.


;N-(CH2)3OCH3
0 NH,

Palanil Brilliant Blue BG-M

Palanil Brilliant Blue BG-ME

Examples 3-4 -Preparation of Mixtures
Example 3
A dye (1), synthesized as described in Example 1, contained less than 10% by weight of the corresponding N,N-dibutyl compound as impurity. A press paste of this dye is bead milled as a 40% aqueous slurry with 20 parts of a high temperature stable dispersing agent until the dye particle size (mean diameter) is in the range of 0.1 - 5 microns.
A dye (2), as described in Example 2, is made up into a press paste, which is also bead milled in the same manner as a dye (1).
Each of the milled pastes of dyes (1) and (2) are combined with one another and the dispersion was standardized to a liquid brand containing 20.5% of the mixture, by the addition of 6.5 parts of a humectant and water (to 100 parts). This is especially suitable for use in the direct printing and continuous dyeing of polyester and polyester/cellulose blends and can also be used for exhaust dyeing.
The same dispersion is standardised to a solid brand, containing 12 parts of dye (I), 29 parts of dye (2) and 59 parts of dispersing agent, by the addition of 39 parts of a temperature stable dispersing agent and drying to either a grain or powder form in a spray dryer. The product is especially suitable for the exhaust dyeing of polyester, polyester/cellulose and polyester/wool blends and can also be used for continuous dyeing and direct printing.

Example 4
Example 3 is repeated except that 100 parts of the spray dried grains contain 6 parts of dye(l) and 33 parts of dye (2) .
Examples 5-6
A dyebath for the exhaust dyeing of polyester in piece form is prepared by adding 3mls of an aqueous dispersion of the solid composition of Examples 3 and 4 respectively (lg dye in 100 ml water at 40-50°C) to 55.8ml of de-ionised water and 1.2ml of buffer —solution. To this dyebath is"added a 5g piece of polyester and the whole is held for 45 minutes at 130°C in a Werner Mathis Labomat high temperature dyeing machine. After rinsing with water and a reduction clearing treatment, the material is dyed a bright greenish-blue shade with excellent build up and light fastness.

WE CLAIM:-
1. A dye mixture comprising
(A) at least one pyrroline type dye of the formula (I)

wherein R1 is H, C1-20alkyl or C2-2oalkenyl; and D is aryl; and
(B) at least one anthraquinone type dye of the formula (II)

wherein RB is (CH2)nORB1;
RB1 is C1-6alkyl or C1-6alkoxy-C1-6alkyl; n is 1-6; and ZB is 0 or NH
2. A dye mixture as claimed in claim 1, wherein, in a dye of the formula (I) of the mixture, D is a group of the formula (a)


wherein each of R2 and R3 independently is an alkyl, cycloalkyl, aryl, alkenyl or aralkyl group.
3. A dye mixture as claimed in claim 2, wherein D is a group of the formula (a), R2 is as defined in claim 2 and R3 is C7-2oalkyl.
4. A dye mixture as claimed in claim 3, wherein R2 is C4H9 and R3 is 1 -methyl-n-hexyl.
5. A dye mixture as claimed in claim 4, wherein component (A) is a pyrroline type dye (A1) of the formula (I) wherein R1 is H, R2 is C4H9 and R3 is 1-methyl-n-hexyl or is a mixture of the pyrroline-type dye (A1) with a pyrroline-type dye (A2) of the formula (I) wherein R1 is H and each of R2 and R3 is C4H9, which pyrroline-type dye mixture contains up to 10%, by weight of the total weight of the pyrroline-type dye mixture, of the dye (A2).
6. A dye mixture as claimed in claim 3, wherein component (A) is a pyrroline-type dye (A3) or (A4), each of the formula (I), or is a mixture of the dyes (A3) and (A4),
which dye (A3) is a dye wherein R1 is H, R2 is ethyl and R3 is n-octyl and
which dye (A4) is a dye wherein R1 is H, R2 is ethyl and R3 is 2-ethyl-n-hexyl.
7. A dye mixture as claimed in claim 2, wherein D is a group of the
formula (a), R2 is as defined in claim 2 and R3 is C1-6alkyl.

8. A dye mixture as claimed in claim 7, wherein R1 is H or allyl, R2 is 3-phenyl-n-propyl and R3 is C4H9.
9. A dye mixture as claimed in any preceding claim, wherein component (B) is at least one of the anthraquinone type dyes (B1), (B2) and (B3), each of the formula (II) wherein ZB is O and n is 2 or 3,
in which dye (B1), RB1 is methyl
in which dye (B2), RB1 is methoxyethyl; and
in which dye (B3), RB1 is ethyl.
10. A dye mixture as claimed in claim 9, which is a mixture of each of the dyes (B1), (B2) and (B3).
11. A dye mixture as claimed in claim 9, wherein component (B) is a mixture of the anthraquinone-type dyes (B1) and (B2).
12. A dye mixture as claimed in claim 11, wherein the ratio by weight of dye (B1) : dye (B2) is from 30:70 to 60:40 inclusive.
13. A dye mixture as claimed in claim 12, wherein the said ratio of dye (B1) : (B2) is from 45:55 to 48:52.
14. A dye mixture as claimed in any preceding claim, wherein the ratio by weight of component (A) : component (B) is from 3:97 to 60:40 inclusive.
15. A dye mixture as claimed in claim 14; wherein the said ratio of component (A) : component (B) is from 8:92 to 35:65 inclusive.
16. A dye mixture as claimed in claim 2, wherein component (A) is a pyrroline-rype dye of the formula (I), wherein R1 is H, R2 is C4H9 and R3 is 1-methyl-n-hexyl or a mixture thereof with up to 10% by weight of a pyrroline-type dye of the formula (I) wherein R1 is H and each of R2 and R3 is C4H9, and

component (B) is a mixture of anthraquinone-type dyes (B1) and (B2), given and defined in claim 9.
17. A dye mixture as claimed in claim 16, wherein the ratio of component (A) : component (B) is from 10:90 to 30:70.
18. A dye mixture as claimed in claim 17, wherein the said ratio is 6:33.
19. A dye mixture as claimed in any one of claims 16 to 18, wherein the ratio, by weight, of dye (B1) : (B2) is from 45:55 to 48:52.
Dated this 12th day of March, 2001.
(RITUSHKA NEGI)
OF REMFRY & SAGAR
ATTORNEY FOR THE APPLICANTS

Documents:

in-pct-2001-00273-mum-cancelled pages(11-05-2005).pdf

in-pct-2001-00273-mum-claims(granted)-(11-05-2005).doc

in-pct-2001-00273-mum-claims(granted)-(11-05-2005).pdf

in-pct-2001-00273-mum-correspondence(07-09-2005).pdf

in-pct-2001-00273-mum-correspondence(ipo)-(06-05-2005).pdf

in-pct-2001-00273-mum-form 1(12-03-2001).pdf

in-pct-2001-00273-mum-form 19(26-03-2004).pdf

in-pct-2001-00273-mum-form 1a(25-04-2005).pdf

in-pct-2001-00273-mum-form 2(granted)-(11-05-2005).doc

in-pct-2001-00273-mum-form 2(granted)-(11-05-2005).pdf

in-pct-2001-00273-mum-form 3(25-04-2005).pdf

in-pct-2001-00273-mum-form 6(14-09-2005).pdf

in-pct-2001-00273-mum-form-pct-ipea-409(12-05-2004).pdf

in-pct-2001-00273-mum-form-pct-isa-210(12-05-2004).pdf

in-pct-2001-00273-mum-petition under rule 137(25-04-2005).pdf

in-pct-2001-00273-mum-power of authority(14-03-2001).pdf

in-pct-2001-00273-mum-power of authority(23-08-2005).pdf

in-pct-2001-00273-mum-power of authority(25-04-2005).pdf


Patent Number 207757
Indian Patent Application Number IN/PCT/2001/00273/MUM
PG Journal Number 32/2007
Publication Date 10-Aug-2007
Grant Date 22-Jun-2007
Date of Filing 12-Mar-2001
Name of Patentee BASF AKTIENGESELLSCHAFT
Applicant Address D-67056 LUDWIGSHAFEN, GERMANY.
Inventors:
# Inventor's Name Inventor's Address
1 ALAN LEAVER 12 EGERTON ROAD, ECCLES, MANCHESTER M30 9LR, UNITED KINGDOM
2 DAVID BRIERLEY 3 TURFLAND AVENUE, ROYTON, OLDHAM OL2 6EL, UNITED KINGDOM
3 JAMES FRANKLIN BULLOCK STRAHLENBERGER STRASSE 50, D-69198 SCHRIESHEIM, GERMANY
PCT International Classification Number C09B 67/22
PCT International Application Number PCT/GB99/03300
PCT International Filing date 1999-10-06
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 9822336.5 1998-10-13 U.K.