Title of Invention	METHOD OF PHOTO BLEACHING TEXTILES
Abstract	A method of photo-bleaching a textile comprising the steps of treating a textile with a photo-bleaching composition, the photo-bleaching composition comprising vitamin K3 together with at least 1 wt% an ingredient selected from the group consisting of: fabric conditioning agent; and, surfactant, in an aqueous wash medium followed by irradiating the treated textile.

Full Text

FORM - 2 THE PATENTS ACT, 1970 (39 of 1970) & The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10 and Rule 13) METHOD OF PHOTO BLEACHING TEXTILES HINDUSTAN LEVER LIMITED, a company incorporated under the Indian Companies Act, 1913 and having its registered office at Hindustan Lever House, 165/166, Backbay Reclamation, Mumbai - 400 020, Maharashtra, India GRANTED 16-3-2007 ORIGINAL 879/MUMNP/2005 The present invention relates to a photo-bleaching composition. The present invention also relates to a method of treating fabric using the photo-bleaching composition. Background of the Invention EP 0035470 discloses a textile treatment composition, which comprises a photo-bleaching component. The photo-bleach material has some effect against stains, but can also attack dye. EP 1196521 discloses a fabric care system comprising a radical photo-initiator selected from hydrogen abstraction photo-initiators, bond cleavage radical photo-initiators or mixtures thereof is used to treat fabric, for example as a stain removal system in the washing or rinsing of fabric in a laundry process. Summary of the Invention A method of photo-bleaching a textile comprising the steps of treating a textile with a photo-bleaching composition, the photo-bleaching composition comprising vitamin K3 together with at least 1 wt% an ingredient selected from the group consisting of: fabric conditioning agent; and, surfactant, in an aqueous wash medium followed by irradiating the treated textile. The present invention provides a bleaching composition, comprising an aromatic 1, 4 quinone together with at least 1 WO 2004/072217 PCT/EP2004/000960 10 15 wt% an ingredient selected from the group consisting of: fabric conditioning agent, and surfactant. The remaining bulk of the bleaching composition comprises carriers and adjunct ingredients to 100 wt/wt % of the total bleaching composition. This bulk, in part or whole, may be selected from solvents, conditioners, builders, other bleach components, softening agents and other components as described herein. It has also been found that the photo-bleach of the present invention has the advantage that they are stable in solution if kept in the dark. It is found that they do not degrade spontaneously on storage. The photo-bleach systems according to the present invention are found to be soluble or dispersible in other media than water and can be used on dry-clean only garments. 20 The present invention extends to a commercial package comprising the aromatic quinone (photobleach) of the present invention together with instructions for its use in the treatment of a textile. -25 - Detailed Description of the Invention The following are exemplified non-limiting structures of suitable aromatic quinones that may used in the present invention: WO 2004/072217 PCT/EP2004/000960 The aromatic quinone is part of a six membered conjugated ring. The aromatic quinone comprises two oxygen atoms that are 1,4 (e.g. as found in 1,4-naphthoquinone). In contrast to benzoquinone per se, it is preferred that the aromatic 10 quinone moiety is further part of an extended conjugated pi system, such as found in naphthoquinones, and anthraquinones etc. It is preferred that the aromatic quinone comprises the core structure of napthoquinone, this encompasses anthraguinone. WO 2004/072217 PCT/EP2004/000960 The extended conjugated pi system may contain one or more heteroatoms as illustrated below. O 5 The aromatic quinones may be optionally substituted provided that the substituent does not result in rapid intramolecular quenching of the excited state of the aromatic quinone. The rate of intramolecular quenching is dependent on two factors the type of substituent and the position of the substituent 10 with respect to the carbonyl groups of the quinone. With reference to the structures illustrated below, structure (a) is not suitable because of the propensity for intramolecular quenching; it is seen that the amine is three atoms remote from a carbonyl of the quinone. The quinone of structure 15 (b) is suitable for use with the present invention because the carbonyl is four atoms remote from a carbonyl of the quinone. 20 As one skilled in the art will appreciate not only an amine substituent would serve to quench the excited state of the WO 2004/072217 PCT/EP2004/000960 quinone; examples of other such substituents to be avoided which are three atoms remote from a carbonyl of the quinone are: -OH, NR2, -NHR, wherein R is alkyl or aromatic. With regard to this intermolecular quenching, it is most 5 preferred that the aromatic quinone used in the present invention has a half-life (t1/2) of greater than 100 ns in oxygen free benzene after irradiation. The half-life(t1/2) is the intrinsic quality of the aromatic quinone per se. Reference to half-life (t1/2) as described herein is as 10 described above unless explicitly defined otherwise. The following are suitable aromatic quinones that may used in the present invention: 1,4-naphthoquinone, 9,10-anthraquinone , 2-methyl-l,4-napthoquinone (vitamin K3) which 15 is widely used in chicken feed [the holistic approach to chicken nutrition and stain removal]. The preferred aromatic quinones are those based upon vitamin K3 or metabolites thereof. Vitamin K3 is particularly preferred because we have surprisingly found that vitamin X3 is 20 classified as not photo-toxic according to the protocol as found in Annex II "B.41. Photo-toxicity-In Vitro 3T3 NRU Photo-toxicity Test" of the Commission Directive 2000/33/EC of 25 April 2000 as published in Official Journal of the European Communities EN. L 136/98 8.6.2000. 25 The photo-bleach suitably undergoes one of the reactions set out above when excited by radiation falling generally in the range 290-800 nm. For example, natural sunlight, which comprises light in this region, will be suitable for causing 30 the photo-bleach to undergo one of the reactions described above. Preferably, the photo-bleach has a maximum WO 2004/072217 PCT/EP2004/000960 extinction-coefficient in the ultraviolet range (290-400 nm) which is greater than 100 mol-1 1cm-1 Suitably, the photo-bleach is a solid or a liquid at room temperature. 5 Preferably, the photo-bleach is substantially colourless and gives non-coloured photoproducts upon irradiation. The present inventors have found that photo-bleaches having a specified hydrophobicity, measured by their log P value, 10 have a particularly preferred effect. All materials for the removal of stains also have a tendency to attack dye. The preferred photo-bleach systems have a particularly beneficial balance of stain removal versus dye attack tendency. 15 20 Preferably, the photo-bleach has a high log P value, where log P is the octanol-water partition coefficient. It is preferred that the photo-bleach has a log P measured at 25°C in excess of 2.5 and more preferably in excess of 4.0. The Log P value may be changed by varying pendant groups of the aromatic quinone. Fabric Care/Fabric Wash Bleaching Compositions 25. The present invention is suitable for use in industrial or domestic fabric wash compositions, fabric conditioning compositions and compositions for both washing and conditioning fabrics (so-called through the wash conditioner 3 0 compositions). The present invention can also be applied to WO 2004/072217 PCT/EP2004/000960 industrial or domestic non-detergent based fabric care compositions, for example spray-on compositions. Fabric wash compositions according to the present invention 5 may be in any suitable form, for example powdered, tableted powders, liquid or solid detergent bars. Fabric wash compositions according to the present invention comprise a fabric wash detergent material selected from non-10 soap anionic surfactant, nonionic surfactants, soap, amphoteric surfactants, zwitterionic surfactants and mixtures thereof. Suitable anionic surfactants are well known to the person 15 skilled in the art and include alkyl benzene sulphonate, primary and secondary alkyl sulphates, particularly C8-C15 primary alkyl sulphates; alkyl ether sulphates; olefin sulphonates; alkyl xylene sulphonates, dialkyl sulphosuccinates; ether carboxylates; isethionates; 20 sarcosinates; fatty acid ester sulphonates and mixtures thereof. The sodium salts are generally preferred. Nonionic surfactants are also well known to the person skilled in the art and include primary and secondary alcohol ethoxylates, especially C8-C20 aliphatic alcohol ethoxylated 25 with an average of from 1 to 20 moles_ of e_thylene oxide per mole of alcohol, and more especially the C10-C15 primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol. Non-ethoxylated nonionic surfactants include alkyl 3 0 polyglycosides, glycerol monoethers and polyhydroxy amides (glucamide). Mixtures of nonionic surfactant may be used. WO 2004/072217 PCT/EP2004/000960 Detergent compositions suitable for use in domestic or industrial automatic fabric washing machines generally contain anionic non-soap surfactant or nonionic surfactant, or combinations of the two in suitable ratio, as will be 5 known to the person skilled in the art, optionally together with soap. Many suitable detergent-active compounds are available and fully described in the literature, for example in "Surface-10 Active Agents and Detergents", Volumes I and II, by Schwartz, Perry & Berch. Anionic surfactant is suitably present at a level of from 5 wt% to 50 wt%, preferably 10 wt%-40 wt% based on the fabric 15 treatment composition. Nonionic surfactant is suitably. present at a level of 1 to 2 0 wt%, preferably 5 to 15 wt%. The total amount of surfactant present in the bleaching composition will depend upon the intended end use and may be 20 as high as 60 wt% for example in a composition for washing fabrics by hand. In this regard it is preferred that the bleaching composition comprises between 2 to 60 is wt% of a surfactant, preferably 5 to 40 wt%. The surfactant has an HLB (hydrophilic/lipophilic balance) greater that 10, more 25 preferably greater than 15,... For a discussion of HLB the reader is directed to and article by Griffin, W. C. in J. Soc. Cosmetic Chemists Vol. 1 page 311, 1945 and Davies, J. T. and Rideal, E. K. in Interfacial Phenomena, Acad. Press, NY, 1961, pages 371 to 382. The HLB value requirement 3 0 reflects the importance of the rate of solubility and dispersibility of the surfactant present from the bleaching WO 2004/072217 PCT/EP2004/000960 composition to the aqueous wash medium inconjunction with surface activity towards the substrate being washed. Detergency Builder 5 The detergent compositions of the invention will generally also contain one or more detergency builders as described in EP 1196521. Sodium carbonate is preferred as a builder. The total amount of detergency builder in the compositions will 10 be suitably in the range from 5 to 80 wt%, preferably from 10 to 60 wt%. Other Bleach Components 15 Detergent compositions according to the invention may also suitably contain a peroxy bleach system for example, inorganic persalts or organic peroxyacids, capable of yielding hydrogen peroxide in aqueous solution. 20 Suitable peroxy bleach compounds include organic peroxides such as urea peroxide, and inorganic persalts such as the alkali metal perborates, percarbonates, perphosphates, persilicates and persulphates. Preferred inorganic persalts are sodium perborate monohydrate and tetrahydrate, and 25 sodium percarbonate. Preferred is sodium percarbonate having a protective coating against destabilisation by moisture. Most preferred is sodium percarbonate having a protective coating, for example 30 comprising sodium metaborate and sodium silicate is disclosed in GB 2 123 044B (Kao). WO 2004/072217 PCT/EP2004/000960 Fabric Softening Composition The fabric treatment composition of the present invention may be a fabric conditioning composition or it may comprise 5 fabric conditioner. The fabric softening compound is preferably a cationic nonionic or anionic fabric softening compound. It is preferred that the bleaching composition of the present 10 invention when used as a fabric conditioning/softening bleaching composition comprises at least 5 % of fabric softening compound(s). The fabric softening compoud may be a quaternary ammonium 15 material comprising a polar head group and one or two alkyl or alkenyl chains. The fabric softening compound may also be a nonionic fabric softening compound such as a fabric softening oil, a fabric softening silicone composition or a fabric softening ester composition such 20 as sugar esters. Particularly preferably, the fabric softening compound has two long chain alkyl or alkenyl chains with an average chain length greater than C14, more preferably each chain 25 has an average chain length greater than C14, more preferably at least 50% of each long chain alkyl or alkenyl group has a chain length of C18. It is preferred if the long chain alkyl or alkenyl groups 3 0 of the fabric softening compound are predominantly linear. WO 2004/072217 PCT/EP2004/000960 10 It is. highly preferred if the fabric softening compounds are substantially water-insoluble. Substantially insoluble fabric softening compounds in the context of this invention are defined as fabric softening compounds having a solubility less than 1 x 10-3 wt% in demineralised water at 20°C, preferably the fabric softening compounds have a solubility less than 1 x 10-4, most preferably the fabric softening compounds have a solubility at 20°C in _ demineralised water from 1 x 10-3 to 1 x 10-6 Well known species of substantially water-insoluble quaternary ammonium compounds having the formula: 15 N X' 20 wherein R'" and R^ represent hydrocarbyl groups having from 12 to 24 carbon atoms; R'^ and R* represent hydrocarbyl groups containing 1 to 4 carbon atoms; and X is an anion, preferably selected from halide, methyl sulphate and ethyl sulphate groups are preferred. 25 30 Representative examples of these quaternary softeners include di(tallow alkyl) dimethyl ammonium methyl sulphate; dihexadecyl dimethyl ammonium chloride; di (hydrogenated tallow alkyl) dimethyl ammonium chloride; dioctadecyl dimethyl ammonium chloride; di (hydrogenated tallow alkyl) dimethyl ammonium methyl sulphate; WO 2004/072217 PCT/EP2004/000960 dihexadecyl diethyl ammonium chloride; di(coconut alkyl) dimethyl ammonium chloride, ditallow alkyl dimethyl ammonium chloride and di(hydrogenated tallow alkyl) dimethyl ammonium chloride (Arquad 2HT Trade Mark). 5 Other preferred softeners contain esters or amide links, for example those available under the trade names Accosoft 580, Varisoft 222, and Stepantex. 10 Particularly preferred fabric softening compounds are water-insoluble quaternary ammonium materials which comprise a compound having two C12-18 alkyl or alkenyl groups connected to the molecule via at least one ester link. It is more preferred if the quaternary ammonium. 15 material has two ester links present. The preferred ester-linked quaternary ammonium material for use in the invention can be represented by the formula: 20 R^ N"" (CH2)n-T-R^ X" -.25 (CH2)a.-T-R^ wherein each R-"" group is independently selected from Ci_4 alkyl, hydroxyalkyl or C2-4 alkenyl groups; and wherein each R^ group is independently selected from C8-28 alkyl or 30 alkenyl groups; wo 2004/072217 PCT/EP2004/000960 13 O O II II T is -C-0- or -0-C-; X is any suitable anion and n is an integer from 0-5. Particularly preferred is di(ethyl 5 ester) dimethyl ammonium chloride (DEEDMAC). A second preferred type of quaternary ammonium material can be represented by the formula: 10 OOCR2 15 wherein R1, n, X- and R2 are as defined above. It is advantageous for environmental reasons if the quaternary ammonium material is biologically degradable. 20 Preferred materials of this class such as 1,2 bis[hardened tallowoyloxy]-3-trimethylammonium propane chloride and their methods of preparation are, for example, described in US 4 137 180 (Lever Brothers). Preferably these materials 25 comprise small amounts of the corresponding monoester as described in US 4 137 180 for example 1-hardened tallowoyloxy-2-hydroxy trimethylammonium propane chloride. The fabric softening agent may also be a polyol ester quat 30 (PEQ) as described in EP 0 638 639 (Akzo). WO 2004/072217 PCT/EP2004/000960 Other Ingredients The compositions of the invention can also contain one or more optional ingredients, selected from pH buffering 5 agents, perfume carriers, fluorescers, colorants, hydrotropes, antifoaming agents, antiredeposition agents, enzymes, optical brightening agents, opacifiers, anti-shrinking agents, anti-wrinkle agents, anti-spotting agents, germicides, fungicides, anti-corrosion agents, drape 10 imparting agents, antistatic agents and ironing aids. The present invention may be in the form of a dilute or concentrated aqueous solution or suspension, for example as described in WO 97/15651, WO 95/27769. Alternatively, the 15 composition may be in the form of a powder for use in the rinse cycle of an automatic washing machine. Alternatively, the composition may be in the form of a sheet comprising fabric conditioning compositions for use in a tumble dryer, for example as disclosed in WO 95/27777. Alternatively, the 20 composition may be in the form of a substantially non¬aqueous concentrate as described in international patent application no. PCT/EP99/00497. The composition may also comprise a transition metal 25 . catalyst or precursor thereof, for example as described in PCT/GB99/02876 and PCT/EPO1/13314. The compositions according to the present invention may further include through the wash softening material, such as 3 0 cationic fabric softener. WO 2004/072217 PCT/EP2004/000960 Non-Detergent-Based Fabric Care Products The present invention can also be used in non-detergent-based fabric care products. For example, the product may 5 comprise the stain removal system as the principal ingredient. For example, non-detergent based compositions may comprise solutions of the stain removal system of the present invention in a suitable solvent, such as isopropanol, alcohol etc. The compositions may comprise 10 aerosol or spray-on compositions. They may be in the form of sticks, bars, dab-on compositions, for example absorbed into sponges for application to the surface etc. Hair and Skin Bleaching 15 A bleaching composition comprising vitamin K3 is suitable for bleaching hair and skin and in this regard the present invention extents to such. The hair/skin bleaching composition comprises suitable adjutants and carriers as 20 found in respective chapters of Harry's Cosmeticology, 8th edition, Edited by Dr Martin Rieger; ISBN: 0-82060372-4. The present invention extends to a method of treating hair and skin respectively with a vitamin K3 containing composition. 25 other. Applications There is consumer concern with regard to chemical contact between consumer and the majority of chemical compounds. Irrespective of whether the concern is judged to be 30 warranted or not, the perception by the consumer is of paramount concern to producers of products. It would be WO 2004/072217 PCT/EP2004/000960 desirable to be able to-allay consumer concern by providing products having more "consumer friendly" acceptable photo-initiators. In,this regard, vitamin K3 may be used also as a photo-initiator for polymerisation of monomers for the 5 production articles, in particular food packaging. The photo-polymerisation may be carried out with a chain carrier, for example an amine synergist, to improve the polymerisation process. Particularly preferred are acrylated 10 amine oligomers as they will be polymerised into the polymer matrix and hence cannot escape. The present invention will be further described by way of example only with reference to the following examples. 15 Example 1 The following three photo-bleaches were selected for comparison 2 , 4, 6-trimethyl benzophenone, Esacure KIP-150, and 2-ethyl-anthraguinone. Esacure KIP-150 is alpha-hydroxy- 2 0 ketone based bond cleavage initiator and is available from Lamberti Spa (Via Marsala, 38 21013 Gallarate VA Italy). The benzophenone is an example of a non-catalytic hydrogen abstractor photo-bleach in contrast to the aromatic quinones of the present invention. 25 Palm oil stained cloths (Brazilian) were prepared as follows. Palm oil 0.06g was added deposited onto individual woven white cotton cloth samples weighing 1.2g each. The cloth samples were allowed to age for 1 hour before being 3 0 washed. Each wash consisted of four stained cloths, 200ml of 40 °C water and 1g of Persil Colour washing powder (purchased WO 2004/072217 PCT/EP2004/0009f)0 10 in UK, zeolite based). The wash liquor was agitated for 20 minutes then the clothes rinsed in cold water, wrung and irradiated in a weatherometer for 18 minutes. The weatherometer is designed to simulate outside line drying and was set to give 42 W/m2 in the UVA&B. The washes were duplicated but with the addition of 9 ppm of the photo-bleach to the wash solution, corresponding to 0.18% by weight on the powder formulation. After the wash/irradiation procedure the staining of the clothes relative to clean white cloth was measured on a reflectometer and expressed as the deltaE value. 15 Esacure KIP150 = oligo[2-hydroxy-2-methyl-l-[4-(1-methylvinyl)phenyl]propanone. The results are presented in Table 1. 20 Average deltaE Control 24.9 2,4,6-trimethylbenzophenone 16.2 Esacure KIP150 16.7 2-ethylanthraquinone 2.5 Table 1 In the absence of photo-bleach a strong coloured stain is observed on the cloth, as indicated by the high deltaE value. The three photo-bleach result in bleaching of the stain and reduce the deltaE value. The results show that 2- WO 2004/072217 PCT/EP2004/000960 10 ethylanthraquinone provides a greater bleaching effect over the other photo-bleaches. It is evident from the results that the stain is essentially removed in the experiment where 2-ethylanthraquinone is employed as a photo-bleach. Example 2 The following three photo-bleaches were selected for comparison Esacure KIP-150, Camphoroquinone (non-aromatic quinone), and 2-methyl-1,4-napthoquinone. The same procedure as found Example 1 was used and the results presented in Table 2. Average deltaE Control 24.5 Esacure KIP150 15.3 Camphoroquinone 23.5 2-methyl-l,4-napthoquinone 2.9 15 Table 2 The aromatic quinone provides greater photo-bleaching than the other photo bleaches. 20 Example 3 A 1.5 g sample of PEG-methacrylate was poured into a glass tube and sealed. A similar sample was prepared but with the addition of 0.15% of vitamin K3. The samples were place outside on a sunny morning in February 2 0 03 facing the sun 25 at an angle of 10 degrees to the earth in Port Sunlight, Wirral, UK. After 3 0 minutes the sample containing vitamin WO 2004/072217 PCT/EP2004/0009r,0 K3 had polymerised, as evidenced by the formation of a thick polymer film. A control mixture without vitamin K3 did not form a thick polymer film. 5 Photo-Toxicity Test Photo-bleaches were tested for photo-toxicity using the Photo-toxicity-In Vitro 3T3 NRU Photo-toxicity Test" of the Commission Directive 2000/33/EC of 25 April 2000 as 10 published in Official Journal of the European Communities EN. L 136/98 8.6.2000. A positive result in the in vitro 3T3 NRU photo-toxicity test (PIF > 5 or MPE > 0,1) indicates that the test 15 substance has photo-toxic potential. A negative result from the in vitro 3T3 NRU photo-toxicity test (PIF The photo-bleaches and the results are listed in Table 3 below, PIF values are quoted to 2 significant figures. WO 2004/072237 PCT/EP20 Table 3 5 The photo-toxicity experiments were repeated twice more for vitamin K3. PIF values of 1.9 and 1.6 were obtained confirming vitamin K3 as non-photo-toxic. WO 2004/072217 PCT/EP2004/000960 CLAIMS: 1. A bleaching composition, comprising an aromatic 1,4 quinone together with at least 1 wt% an ingredient 5 selected from the group consisting of: fabric conditioning agent, and surfactant. 2. A bleaching composition according to claim 1, wherein the quinone comprises the core structure of 10 napthoquinone. 3. A bleaching composition according to claim 1, wherein the aromatic quinone is selected from the group consisting of: napthoquinones and anthraquinone. 15 A bleaching composition according to claim 1, wherein the aromatic quinone is a vitamin K3. A bleaching composition according to any preceding claim, wherein the bleaching composition comprises between 2 to 60 is wt% of a surfactant. A bleaching composition according to any one of claims 1 to 5, being a fabric conditioner composition, wherein the composition comprises at least 5 % of a fabric conditioner. A bleaching composition according to claim 5 or 6, comprising a builder material. WE CLAIM 1. A method of photo-bleaching a textile comprising the steps of treating a textile with a photo-bleaching composition, the photo-bleaching composition comprising vitamin K3 together with at least 1 wt% an ingredient selected from the group consisting of: fabric conditioning agent; and, surfactant, in an aqueous wash medium followed by irradiating the treated textile. 2. A method of photo-bleaching a textile according to claim 1, wherein the photo-bleaching composition comprises between 2 to 60 wt% of a surfactant. 3. A method of photo-bleaching a textile according to claim 1 or claim 2, wherein the photo-bleaching composition comprises at least 5 wt% of a fabric conditioner. 4. A method of photo-bleaching a textile according to any preceding claim, wherein the photo-bleaching composition comprises a builder material. 5. A method of photo-bleaching according to claim 4, wherein the photo-bleaching composition comprises at least 2% sodium carbonate. Dated this 10th day of August 2005. Abhishek Sen Of S. MAJUMDAR & CO. (Applicant's Agent)

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