NZ269755A

NZ269755A - Pearlescent based concentrate comprising a pearlescent ester or acid, an alkylpolysaccharide and alkyl sulphates

Info

Publication number: NZ269755A
Application number: NZ269755A
Authority: NZ
Inventors: Katherine Margaret Wansborough; Anne Maree Lombard; Pamela Joyce Jones
Original assignee: Ici Australia Operations
Priority date: 1993-07-28
Filing date: 1994-07-26
Publication date: 1997-10-24
Also published as: WO1995003782A1; KR960703565A; CA2168346A1

Description

<div class="application article clearfix" id="description"> New Zealand Paient Spedficaiion for Paient Number £69755 New Zealand No. 269755 International No. PCT/AU94/00421 TO BE ENTERED AFTER ACCEPTANCE AND PUBLICATION Priority dates: 28.07.1993; Complete Specification Filed: 26.07.1994 Classification: (6) A61 K7/50.075; C11D17/00; C11D9/26.60 Publication date: 24 October 1997 Journal No.: 1421 Title of Invention: Pearlescent based concentrate for personal care products Name, address and nationality of applicant(s) as in international application form: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED, 1 Nicholson Street, Melbourne, Victoria 3000, Australia NO DRAM NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION New Zealand No. 269755 International No. PCT/AU94/00421 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of Invention: Pearlescent based concentrate for personal care products Name, address and nationality of applicant(s) as in international application form: ICI AUSTRALIA OPERATIONS PROPRIETARY LIMITED, of 1 Nicholson Street, Melbourne, Victoria 3000, Australia . Ar* . ^ I* IK WO 95/03782 PCT/AU94/00421 269755 PEARLESCENT BASED CONCENTRATE FOR PERSONAL CARE PRODUCTS The invention relates to pearlescent based concentrates comprising at least one alkylpolysaccharide, traditional pearlescent esters or acid and alkyl sulphates and to processes for the preparation thereof. Personal care products such as handsoaps, bubble baths, shampoos and hair conditioners often include in their composition agents which impart a pleasant, pearl-like glossy 10 appearance in order to enhance the appeal of such products to the consumer. The agents which impart this appearance are known as pearlescent based concentrates and generally comprise microscopic platelike crystals which remain dispersed in compositions to which they are added and reflect 15 light in such a manner as to impart a pearl-like appearance. Pearlescent based concentrates of the prior art have included finely divided natural substances or inorganic compounds such as mica, fish scale, bismuth oxychloride or the like. For example, Japanese patent application no. 20 90/134,825 (Priority Date; 24 May 1990) describes compositions for cosmetics having a pearly appearance, comprising glucose fatty acid esters and mica and/or mica Ti. In recent years, the use of a fatty acid glycolic ester in pearlescent concentrates has been particularly favoured. 25 In general such concentrates are produced by adding a fatty acid glycolic ester which is solid at room temperature to a composition such as shampoo or the like, followed by heating of the mixture to melt the fatty acid glycolic ester, and then by cooling to recrystallise it and thereby providing 30 small crystals which impart a pearl-like gloss to the composition. In an alternative method of production, a pearling agent dispersion (such as a fatty acid glycolic ester dispersion, which is dissolved and cooled to recrystallise in advance) is mixed with a shampoo or the like 35 at room temperature as described in Japanese Patent Application nos. 71021/81 and 216728/83. WO 95/03782 PCT/AU94/00421 » Other known pearlescent based concentrates have comprised microcrystalline polyvalent metal salts of higher fatty acids or fatty acid glycolic esters such as those described in United States 5 Patent 4,959/200 (Date of Patent; 25 September 1990). Other commonly used pearlescent based concentrates have been prepared using ethylene glycol monostearate, ethylene glycol di-stearate, glycerol monostearate, glycerol di-stearate or a cetyl stearly alcohol or the like in 10 conjunction with other similar esters. These pearlescent based concentrates of the prior art have also normally comprised ether sulphates, betaines, ethanolamide, amine based surfactants and the like which can be used as emulsifiers. United States Patent 5,017,305 (Date of Patent; 15 21 May 1991) describes a typical pearlescent concentrate in the form of a free-flowing dispersion comprising pearlescing esters, ether carboxylic acids and one or more monoethanolamides of Cx2 to C22 fatty acids. One of the disadvantages of the pearlescent based 20 concentrates of the prior art is that they often comprise chemicals which are potential skin sensitisers. Japanese Patent Application no. 21678/83 for example, discloses a pearling agent containing a salt of alkyl sulphate or a salt of polyoxyalkylene alkyl sulphate, a fatty acid 25 dialkanolamide and water as solvents, and a fatty acid glycolic ester at a high concentration. Many factors influence the irritation effect of surfactants and the molecular structure of the surface active agent can be closely linked to its effect on adsorption, solubilization, 30 penetration, swelling, denaturation and general irritation on human skin. Generally, the order of increasing human skin irritation of anionic surfactants commonly used in personal care products is in the following order: 35 Ammonium Laureth Sulphate <Sodium Laureth Sulphate <Ammonium Lauryl Sulphate <Sodium Lauryl Sulphate. WO 95/03782 PCT/AU94/00421 3 Furthermore, some of the pearlescent based concentrates of the prior art have included surfactants which may contain toxic trace impurities which are suspected carcinogens including nitrosamine containing compounds such as 5 diethanolamides. European Patent no. 221465 (22 October 1992) for example, relates to a process for the production of pearlescent pigment comprising ethanolamide. In general, alkyl polyglucosides demonstrate very little tendency to scalp irritations. 10 It has now been found that low irritant pearlescent based concentrates containing biodegradable surfactants can be prepared using alkylpolysaccharides. Ultimate biodegradability was measured using OECD tests 301E and 301A,1981. Alkylpolysaccharides are particularly attractive 15 for use in personal care products because they contain no toxic trace impurities and because they are derived from renewable resources such as coconut oil and wheat starch. The current invention therefore provides a pearlescent based concentrate including: 20 between 5 and 40% by weight of the composition of alkylpolysaccharide of form-la H-Gx-0R1 where R1 is selected from the group comprising linear or branched C6 to C22 alkyl or alkenyl group 25 where G is selected from the group comprising a C5 or C6 saccharide and ^ is from 1 to 10; betwean 3 and 30% by weight of the composition of alkyl sulphate and/or alkyl ether sulphate; 30 and between 5 and 20% by weight of pearlescing esters of formula *2-(OCnH2n)x-OR3 where R is chosen from the group including C16 to C22 fatty acyl groups, 35 R3 is chosen from the group comprising H or R2, WO 95/03782 PCT/AU94/00421 n is 2 or 3 and x is from 1 to 120. 26 9 75 5 The current invention further provides a pearlescent based concentrate including: 5 H-Gx-0Rl where R1 is selected from the group comprising linear or branched Cfi to C22 alkyl or alkenyl group where G is selected from the group comprising a C5 or C{ saccharide and 10 x is from 1 to 10; between 3 and 30% by weight of the composition of alkyl sulphate and/or alkyl ether sulphate? and between 5 to 20% by weight of pearlescing acid of formula R COOH 15 where R is chosen from the group comprising C16 to C22 alkyl groups. In a preferred embodiment the pearlescing esters or acid of the current invention is chosen from ethylene glycol monostearate, ethylene glycol disterate, stearic acid and 20 mixtures thereof. In a preferred embodiment the pearlescent based concentrate of the current invention further includes secondary alkane sulphonates of the formula R4 - CH(CH3)S03M 25 where R4 is chosen from the group comprising C6 to C22 alkyl groups and M is chosen from the group comprising alkali metals 30 In a further preferred embodiment fatty alcohol ethoxylates which may be used in pearlescent based concentrate of the current invention are of the formula R (OC2H4)y OH where R5 is chosen from the group including C6 and C22 alkyl or alkenyl groups and y is from 1 to 120. ■ -^T OFFICE It 57? 1997 WO 95/03782 PCT/AU94/00421 5 The pearlescent based concentrate of the current invention may further include between 0 and 30% by weight of the composition of one or more optional additives chosen from the group including: 5 alkylsulphosuccinate or polyoxyalkylenealkylsulphosuccinate of the formula RS-0- [ CH ( R7) CH20 ] n- [ COCH (S03M) CHjCOOM1 ] where R6 is chosen from the group including C8 to C20 linear or branched alkyl groups, 10 R7 is H or CH3, M1 and M are independently chosen from the group comprising alkali metals, alkaline earth metals, NH4+, Cx to C3 alkyl groups, substituted ammonia and hydroxy substituted C2 or C3 alkyl substituted ammonia and 15 n is from 0 to 8; sorbitan fatty acid esters of formula, CH2- (CHOH) 3-CH0CH20R8 where R8 is chosen from the group including C12 to C18; secondary alkane sulphonates; fatty alcohol alkoxylates; 20 fatty acid alkoxylates; fatty alcohols; alkanoyl N-methylglucamides; ether carboxylic acids; ethoxylated sorbitan fatty acid esters; and alpha-olefin sulphonates. In a preferred embodiment the optional additives of the pearlescent concentrate of the current invention includes 25 fatty alcohols of the formula R90H where R9 is chosen from the group comprising C6 to C22 alkyl groups In a further preferred embodiment the optional additives 30 of the pearlescent concentrate of the current invention includes alkanoyl N-methylglucamides of the formula COR10 CH3-N-CH2 (CHOH) 4CH2OH where R10 is chosen from the group comprising C6 and C22 alkyl 35 groups. wo 95/03782 fct/au94/00421 6 In another preferred embodiment the option^. Clddti^e^o^the pearlescent concentrate of the current invention includes ether carboxylic acids of the formula RnC (0) 0 (C jH40 ) mH 5 where R11 is chosen from the group includes C6 to C22 alkyl groups and m is from 1 to 120. In a further preferred embodiment the optional additives of the pearlescent concentrate of the current invention 10 comprise ethoxylated sorbitan fatty acid esters of the formula (OCH2CH2)wOH (OCH2CH2) yOH CH2 (0CH2CH2) uOH 15 CH2 (OCHjCH) tQC (0) R12 where R12 is chosen from the group comprising C6 to C22 alkyl groups and w, v, u, t are from 4 to 20. In a further preferred embodiment the optional additives 20 of the pearlescent concentrate of the current invention comprise alpha-olefin sulphonates of formula R13CH = CHCHjSOJM2 where R13 is chosen from the group comprising C6 to C22 alkyl groups 25 and M2 is chosen from the group comprising Na & K. Another optional additive to the pearlescent based concentrates of the current invention is between 0 and 2% of at least one inorganic salt including alkali metal halide salt such as NaCl, KC1, Kl and the like. The pearlescent based concentrates of the current invention may also be diluted with between 10 and 90% of the eight of the composition of water or other suitable solvent. WO 95/03782 PCT/AU94/00421 The pearlescent based concentrates of the current invention may also have added optional agents including perfumes, pigments, UV absorbers and antioxidants. There is further provided a method of preparation of the 5 pearlescent based concentrates of the current invention comprising the steps of; (a) heating the components to a temperature above the highest melting point of the components but less than the boiling point of any solvents present and stirring 10 to form a homogeneous solution, and (b) cooling the stirring solution to a temperature of between 35°C and 45°C at a maximum cooling rate of 15°C/hour. The pearlescent based concentrates of the current 15 invention may also be prepared by a method comprising the following steps; (a) heating the components to a temperature above the highest melting point of the components but less than the boiling point of any solvents present while stirring 20 vigorously to form a homogeneous solution, (b) rapidly cooling the stirring solution to between 60°C and 70°C, and (c) cooling the stirring solution to a temperature of between 35°C and 45°C at a maximum cooling rate of 25 15°C/hour. The current invention will now be described with reference to the following non-limiting examples; WO 95/03782 PCT/AU94/00421 8 EXAMPLE 1 A pearlescent based concentrate of the following composition was prepared by the method described below. Component Composition (% w/w) 5 Decylpolysaccharide (50% a.i.) 36.00 Sodium lauryl sulphate (30% a.i.) 10.00 Ethylene Glycol mono-stearate 16.25 Sodium chloride 1.00 Water 36.75 10 Method Ethylene glycol monostearate, decylpolysaccharide, alkyl sulphate, water and sodium chloride were heated to 80°C with vigorous stirring. The solution was maintained at 80°C with stirring for further 30 minutes before being rapidly 15 cooled to 65°C. Once the solution temperature reached 65°C the stirring rate was slowed and the solution cooled at a controlled rate of 10°C per hour until the temperature reached 40°C. The stirrer was then stopped and the pearlescent blend allowed to cool to room temperature. 20 EXAMPLE 2 A pearlescent based concentrate of the following composition was prepared by the method described below. Component Composition (% w/w) Dodecylpolysaccharide (50% a.i.) 25 Sodium lauryl sulphate (30% a.i.) TERIC 12A23 Ethylene glycol mono-stearate Sodium chloride Water 25.00 31.00 3.00 12.50 1.00 27.50 30 Method Ethylene glycol mono-stearate, dodecylpolysaccharide, sodium lauryl sulphate, TERIC 12A23 water and sodium chloride were heated to 80°C with vigorous stirring. Once the solution had reached 80°C, the stirring rate was slowed and the 35 solution cooled at a controlled rate of 10°C per hour until the solution temperature had dropped to 4 0°C. When the solution temperature had reached 40°C the stirrer was* stopped WO 95/03782 PCT/AU94/00421 9 and the pearlescent based composition was allowed to cool to room temperature. (TERIC is a registered trade mark of ICI Australia Operations Proprietary Limited). EXAMPLE 3 5 Component Composition (%w/w) Decylpolysaccharide (50% a.i.) 37.00 Sodium lauryl sulphate 10.00 Cetyl Stearyl alcohol 5.00 Ethylene glycol monostearate 16.25 10 Water 32.75 Method Ethylene glycol monostearate, decylpolysaccharide, sodium lauryl sulphate, cetyl-stearyl alcohol and water were heated to 75°C with vigorous stirring. The solution was 15 cooled until the temperature reached 70°C at which point the rate of cooling was controlled at 15°C/hour and the stirring rate reduced. When temperature reached 40°C, stirring was stopped and the pearlescent based composition allowed to cool to room temperature. 20 EXAMPLE 4 Component Composition (%w/w) Dodecylpolysaccharide (50% a.i.) 36.00 Ammonium lauryl sulphate (25% a.i.) 10.00 Disodium alkyl ethoxy sulphosuccinate 25 (30% a.i.) 13.3 Sodium chloride 1.0 Ethylene glycol distearate 16.25 Water 23.45 Method 30 Dodecylpolysaccharide, ammonium lauryl sulphate, disodium alkylethoxy sulphosuccinate and ethylene glycoldistearate were blended together to form a homogeneous mixture. Sodium chloride was then dissolved in the water and added to the mixture which was heated to 7 0cC with vigorous 35 stirring. When the solution temperature reached 70°C the stirring rate was reduced and the solution cooled at a rate of 8°C/hr. When the solution temperature reached 40°C the WO 95/03782 PCT / AU94/00421 10 stirring was stopped and the resultant pearlescent based concentrate left to cool to room temperature. EXAMPLE 5 Component Composition (.w/w) 5 Decyl Polysaccharide 25.00 Sodium lauryl sulphate 20.00 Ethylene glycol monostearate 7.50 Sodium Chloride 1.00 Water 46.5 10 Method The sodium chloride was dissolved in a portion of the water. The remaining components were blended together and the salt solution mixed in. The resultant mixture was heated to 70°C with rapid stirring then the stirring rate was 15 reduced and the mixture cooled at a rate of 8°C per hour. When the mixture reached 40°C all stirring was ceased. EXAMPLE 6 Component Composition (%w/w) Decyl Polysaccharide 25.00 20 Sodium lauryl sulphate 20.00 Sorbitan monolaurate 5.00 Ethylene glycol monostearate 15.00 Sodium Chloride 1.00 Water 34.00 25 Method The above components were combined according to the method of Example 5 to form a pearlescent based concentrate. EXAMPLE 7 Component Composition (%w/w) 30 C8-10 Polysaccharide 5.00 Decyl Polysaccharide 25.00 Sodium lauryl sulphate 20.00 Ethylene glycol monostearate 15.00 Sodium Chloride 1.00 35 Water 34.00 WO 95/03782 PCT/AU94/00421 11 Method The above components were combined according to the method of Example 5 to form a pearlescent based concentrate. EXAMPLE 8 5 Component Composition (%w/w) Decyl Polysaccharide 30.00 Ammonium lauryl sulphate 20.00 Ethoxylated sorbitan monooleate 2.50 Sodium Chloride 1.00 10 Ethylene glycol monostearate 15.00 Water 31.50 Method The above components were combined according to the method of Example 5 to form a pearlescent based concentrate. 15 EXAMPLE 9 Component Composition (%w/w) Decyl Polysaccharide 30.00 Sodium lauryl sulphate 15.00 Stearic acid 15.00 20 Sodium Chloride 1.00 Water 39.00 Method The above components were combined according to the method of Example 5 to form a pearlescent based concentrate. 25 EXAMPLE 10 Component Composition (%w/w) C16-18 Polysaccharide 10.00 Decyl Polysaccharide 15.00 Sodium lauryl sulphate 15.00 30 Ethylene glycol monostearate 15.00 Sodium Chloride 1.00 Water 44.00 Method The above components were combined according to the 35 method of Example 5 to form a pearlescent based concentrate </div>

Claims

<div class="application article clearfix printTableText" id="claims"> WO 95/03782 PCT/AU94/00421 12 The pearlescent based concentrates of each example exhibited small crystals of relatively uniform size which give a lustrous appearance to the concentrate and good reflectance. 5 While the invention had been explained in relation to its preferred embodiments it is to be understood that various modifications thereof will become apparent to those skilled in the art upon reading the specification. Therefore, it is to be understood that the invention disclosed herein is 10 intended to cover such modifications as fall within the scope of the appended claims. WO 95/03782 PCT/AU94/00421 269755 The claims defining the inventions are as follows: 1. A pearlescent based concentrate comprising: between 5 and 40% by weight of the composition of alkylpolysaccharide of formula 5 H-G^'-OR1' where R1 is selected from the group comprising linear or . branched Cs to C22 alkyl or alkenyl group where G is selected from the group comprising a C5 or C6 saccharide and 10 x is from 1 to 10; between 3 and 30% by weight of the composition of alkyl sulphate and/or alkyl ether sulphate; and between 5 and 20% by weight of pearlescing compound of formula/ 15 R2-(OC„HJ„)„-OR3 where R2 is chosen from the group including C16 to C22 fatty acyl groups, R3 is chosen from the group comprising H or R2, n is 2 or 3 and 20 x is from 0 to 120.
2. A pearlescent based concentrate according to claim 1 comprising: between 5 and 40% by weight of the composition of alkylpolysaccharide of formula 25 H-Gx-0Rl where R1 is selected from the group comprising linear or branched C6 to C22 alkyl or alkenyl group where G is selected from the group comprising a C5 or C6 saccharide and 30 x is from 1 to 10; between 3 and 30% by weight of the composition of alkyl sulphate and/or alkyl ether sulphate; wo 95/03782 jpct/au94/00421 14 pct/au94/00421 269 75 5 and between 5 and 20% by weight of pearlescing acid of formula R COOH where R is chosen from the group including C16 to C22 alkyl 5 groups.
3. A pearlescent based concentrate comprising: between 5 and 40% by weight of the composition of alkylpolysaccharide of formula H-Gjj-OR1 10 where R1 is selected from the group comprising linear or branched C6 to C22 alkyl or alkenyl group where G is selected from the group comprising a C5 or C6 saccharide and x is from 1 to 10; 15 between 3 and 30% by weight of the composition of alkyl sulphate and/or alkyl ether sulphate; and between 5 and 20% by weight of pearlescing esters of formula R2-(°CnH2n)x-OR3 20 where R2 is chosen from the group including C16 to C22 fatty acyl groups, R3 is chosen from the group comprising H or r2, n is 2 or 3 and x is from 1 to 120. 25
4. A pearlescent based concentrate according to claim 3 which further includes secondary alkane sulphonates of the formula R4-CH(CH3)S03M where R4 is chosen from the group comprising 30 C6 to C22 alkyl groups and M is chosen from the group comprising alkali salts.
5. A pearlescent based concentrate according to claim 3 which further includes at least one fatty alcohol ethoxylate of formula R5 (OC2H4) y OH 35 where R5 is chosen from the group including C6 and C22 alkyl or alkenyl groups WO 95/03782 PCT/AU94/00421 15 and y is from 1 to 120.
6. A pearlescent based concentrate according to claim 3 ft which further includes between 0 and 30% by weight of the \j composition of one or more optional additives chosen from the 5 group including: alkylsulphosuccinate or polyoxyalkylenealkylsulphosuccinate of the formula R6-0- [ CH (R7) CHjO ] n- [ COCH (S03M) CHjCOOM1 ] where R6 is chosen from the group including C8 to C20 linear or 10 branched alkyl groups, R7 is H or CHj, M and M1 are independently chosen from the group comprising alkali metals, alkaline earth metals, NH4+, Cl to C3 alkyl groups, substituted ammonia and hydroxy substituted C2 or C3 15 alkyl substituted ammonia and n is from 0 to 8; sorbitan fatty acid esters of formula, CH2- (CHOH) 3-CHOCH2OR8 where R8 is chosen from the group including C12 to C18 alkyl 20 group; secondary alkane sulphonates; fatty alcohol alkoxylates; fatty acid alkoxylates; fatty alcohols; alkanoyl N-methylglueamides; ether carboxylic acids; ethoxylated sorbitan fatty acid esters; and alpha-olefin sulphonates. 25
7. A pearlescent based concentrate according to claim 3 which further inclines fatty alcohols of the formula R9OH where R9 is chosen from the group comprising y C6 to C22 alkyl groups. 30
8. A pearlescent based concentrate according to claim 3 which further includes alkanoyl N-methylglucamides of the formula ,t COR10 I I 35 CH3-N-CH2(CHOH)4CH2OH where R10 is chosen from the group consisting C6 and C22 alkyl groups. wo 95/03782 pct/au94/00421 I 16 6 9 7 5 £
9. A pearlescent based concentrate according to claim 3 which further includes ether carboxylic acids of the formula RllC(0)0(C2H40)BH where Ru is chosen from the group including C6 to C22 alkyl 5 groups and m is from 1 to 120.
10. A pearlescent based concentrate according to claim 3 which further includes ethoxylated sorbitan fatty acid esters of the formula ^ .(OCH2CH2)wOH 10 J ^(OCH2CH2)vOH CH2(OCH2CH2)uOH CH2 (0CH2CH) t0C (0) R12 where R12 is chosen from the group comprising C6 to C22 alkyl groups 15 and w, v, u, t are from 4 to 20.
11. A pearlescent based concentrate according to claim 3 which further includes alpha-olefin sulphonates of formula R13CH = CHCHJSOJM2 where R13 is chosen from the group comprising 20 Cs to C22 alkyl groups and M2 is chosen from the group comprising Na & K.
12. A pearlescent based concentrate according to claim 3 comprising between 0 and 2% of the weight of the composition of inorganic salt. 25
13. A pearlescent based concentrate according to claim 12 wherein said inorganic salt is an alkali metal halide salt.
14. A pearlescent based concentrate according to claim 3 comprising between 10 and 90% of the weight of the composition of solvent. WO 55/03782 PCT/AU94/00421 I 17 26 9 7 5 5
15. A pearlescent composition comprising a pearlescent basedr concentrate according to any of the previous claims and at least one solvent in the ratio of between 10:90 and 90:10 weight %. 5
16. A pearlescent based concentrate according to claim 1 or 2 which further includes secondary alkane sulphonates of the formula R4-CH(CH3)S03M where R4 is chosen from the group comprising 10 Cs to C22 alkyl groups and M is chosen from the group comprising alkali salts.
17. A pearlescent based concentrate according to claim 1 or 2 which further includes at least one fatty alcohol ethoxylate of formula RS(OC2H4)y OH 15 where R5 is chosen from the group including C6 and C22 alkyl or alkenyl groups and y is from 1 to 120.
18. A pearlescent based concentrate according to claim 1 or 2 which further includes between 0 and 30% by weight of the 20 composition of one or more optional additives chosen from the group including: alkylsulphosuccinate or polyoxyalkylenealkylsulphosuccinate of the formula R6-0- [ CH (R7) CH20] n- [ COCH (S03M) CHjCOOM1 ] 25 where R6 is chosen from the group including C8 to C20 linear or branched alkyl groups, R7 is H or CH3, M and M1 are independently chosen from the group comprising alkali metals, alkaline earth metals, NH4+, Cx to C3 alkyl 30 groups, substituted ammonia and hydroxy substituted C2 or C3 alkyl substituted ammonia and n is from 0 to 8; sorbitan fatty acid esters of formula, CH2-(CHOH) 3-CHOCH2OR8 35 where R8 is chosen fromv the group including Cl2 to Cia alkyl group; j r •••• -i WO 55/03782 1 g PCT/AU94/00421 ^6975 secondary alkane sulphonates; fatty alcohol alkoxylates; fatty acid alkoxylates; fatty alcohols; alkanoyl N-methylglucamides; ether carboxylic acids; ethoxylated sorbitan fatty acid esters; and alpha-olefin sulphonates. 5
19. A pearlescent based concentrate according to claim 1 or 2 which further includes fatty alcohols of the formula r'oh where R9 is chosen from the group comprising Cs to C2J alkyl groups. 10
20. A pearlescent based concentrate according to claim 1 or 2 which further includes alkanoyl N-methylglucamides of the formula cor10 I 15 CH3-N-CH2(CHOH)4CH2OH where R is chosen from the group consisting C6 and C22 alkyl groups.
21. A pearlescent based concentrate according to claim 1 or 2 which further includes ether carboxylic acids of the 20 formula RuC(0)0(C2H40)aH where R11 is chosen from the group including C6 to C22 alkyl groups and m is from 1 to 120.
22. A pearlescent based concentrate according to claim 1 or 25 2 which further includes ethoxylated sorbitan fatty acid esters of the formula OCH2CH2)wOH OCH2CH2)vOH CH2(OCH2CH2)uOH 30 CH2 (OCH2CH) tOC (0) R12 where R12 is chosen from the group comprising C6 to C22 alkyl groups and w, v, u, t are from 4 to 20. ! 11 r? 1S97 WO 95/03782 PCT/AU94/00421 269 75 5
23. A pearlescent based concentrate according to claim 1 or which further includes alpha-olefin sulphonates of formula R13CH - CHCHjSOJM2 where R13 is chosen from the group comprising 5 C6 to C22 alkyl groups and M is chosen from the group comprising Na & K.
24. A method of preparing a pearlescent based concentrate of any of claims 3 to 15 comprising the steps of; (a) heating the components to a temperature above the 10 highest melting point of the components but less than the boiling point of any solvents present and stirring to form a homogeneous solution, and (b) cooling the stirring solution to a temperature of between 35°C and 45°C at a maximum cooling rate of 15 15°C/hour.
25. A method of preparing a pearlescent based concentrate of any of claims 3 to 15 comprising the steps of; (a) heating the components to a temperature above tht-highest melting point of the components but less than 20 the boiling point of any solvents present while stirring vigorously to form a homogeneous solution, (b) rapidly cooling the stirring solution to between 6 0°C and 70°C, and (c) cooling the stirring solution to a temperature of 25 between 35°C and 45°C at a maximum cooling rate of 15°C/hour.
26. A method of preparing a pearlescent based concentrate of any of claims 1, 2 or 16 to 23 comprising the steps of; (a) heating the components to a temperature above the 30 highest melting point of the components but less than the boiling point of any solvents present and stirring to form a homogeneous solution, and (b) cooling the stirring solution to a temperature of between 35°C and 45°C at a maximum cooling rate of 35 15°C/hour. ■'0 -11 1937 WO 95/03782 PCT7AU94/00421 20 26 9 7 5 5
27. A method o£ preparing a pearlescent based concentrate o£ any of claims 1, 2 or 16 to 23 comprising the steps of; (a) heating the components to a temperature above the highest melting point of the components but less than 5 the boiling point of any solvents present while stirring vigorously to form a homogeneous solution, (b) rapidly cooling the stirring solution to between 60°C and 70°C, and (c) cooling the stirring solution to a temperature of 10 between 35°C and 45°C at a maximum cooling rate of 15°C/hour.
28. A pearlescent based concentrate substantially as herein described with reference to Examples 1-10.
29. A method of preparing a pearlescent based concentrate as 15 herein described with reference to Examples 1 - 10. (oax^a.Qi^2<^& By the authorised agents HCp^OU END OF CLAIMS M.Z. PA ^n-OFRCEl </div>