CA2190739A1

CA2190739A1 - Detergent composition

Info

Publication number: CA2190739A1
Application number: CA002190739A
Authority: CA
Inventors: Margaret Jobling; Liang Sheng Tsaur; Shiji Shen
Original assignee: Individual
Current assignee: Unilever PLC
Priority date: 1994-07-19
Filing date: 1995-07-18
Publication date: 1996-02-01
Also published as: WO1996002224A1; AU2985695A; ZA955973B; KR970704418A; BR9508782A; JPH09512824A; EP0771186A1; GB9414575D0

Abstract

An aqueous liquid cleansing and moisturising composition comprising a surface active agent, a skin benefit agent having a weight average particle size in the range 50 to 500 microns and a structurant. The composition is substantially free of insoluble fatty acid soap and has a viscosity of at least 5000 Pas at a shear stress of 0.01 Pa at 25.degree.C.

Description

Wo 96l02224 PCT/GB95101687 ~ET~(-.~l`TT C~l`qPOST~ION
The present invention relates to detergent compositions suitable for the care and personal washing of the skin. In particular, it relates to compositions which are f~
to give mild cleansing and conditioning of the skin.
Compositions formulated to cleanse the skin are well known.
It is also known to formulate products which provide both a cleansing and a moisturising benefit.
For example WO 90/13283 discloses a composition comprising an acyl ester of an isethionic acid salt, a long chain fatty acid, a moisturiser component and, optionally, soap.5 One of the problems which may be encountered with such dual ~urpose compositions is that, whilst cleansing may be effective, there is an insufficient level of moisturising.
We have found a way of f~ tinsr such compositions such that they can deliver effective moisturising, conditioning or protection of the skin.
In WO 94/01085 and 94/01084 the advantage of depositing large particles of petrolatum from soap based compositions to moisturise the skin is recognised.
E~owever, according to Wo 94/03152, r~nrPrnP~l with shower gels comprising a non-soap detergent, qi ~ i cnnp oil added to 3 o condition the skin and cationic polymers, the maximum average droplet size of the q11 icr~nP oil that can be used is 2 microns, if product stabilicy is to be T--int~inPd We have now f ound that larger particles, by particle is meant a solid particle or licruid droplet, of benefit agenes such as

2 1 9073q Wo 96/02224 ~ i687 silicone oil can be incorporated in~o non-soap based compositions and stable composi~ions formed by the use of structurants .
Thus, i9rcor~li n~ to the invention there is provided an as[ueous liquid cleansing and moisturising composition comprising:--a3 a surface active agent selected rom anionic, nonionic, zwitterionic, and cationic surface active agents; and mixtures thereof;
b) a benefit agent having a weight average particle size in the range 50 to 500 microns; and c) at least one structur~nt;
wherein the composition is subst~nr;~lly free of ;nc~ hle fatty acid soap and has a viscosity of at least 5, 000 Pas at a shear stress of 0_ 01 Pa at 25C.0 The viscosity quoted is the minimum viscosity required to suspend benef it agent having a welght average particle size of 50 microns such that the composition has a separation rate at 25C o less than l~n per year.5 As the weight average particle size o the benefit agent increases much higher viscosities are re~uirsd to give a composition with the same stability, The comPositiOn is suitable for cleansing and ~moisturising", "conditioning" or "protection~ of the skin. The benefit agent is included in the composition to moisturise, condition W0 96/0222~ ,L. ~ 1687 and/or.protect the skin. sy ~benefit agent~' is meant a sUDstance that softens the skin (stratum corneum) and keeps it soft by retarding the decrea3e of its water content or protects the skin.
s Preferred benefit agents include a) silicone oils, gums and modifications thereof such as linear and cyclic polydimethyl si ln~rAn~q; amino, alkyl alkylaryl and aryl silicone oils:
b) fats and oils including natural fats and oils such as jojoba, soyabean, rice bran, avocado, almond, olive, sesame, persic, castor, coconut, mink oils;
cacao fat, beef tallow, lard; hardened oils obtained by hydrogenating the af.,L~ rinn~-l oils;
and synthetic mono, di and triglycerides such as myristic acid glyceride and 2-ethylhexanoic acid glyceride;
cl waxes such as ~-~rn~llhA, spermaceti, beeswax, lanolin and derivatives thereof;
d) hydrophobic plant extracts;
e) hydrocarbons such as liquid paraffins, petrolatum, microcrystalline wax, ceresin, squalene, squalane, and mineral oil;
f ~ higher fatty acids such as lauric, myristic, palmitic, stearic, behenic, oleic, linoleic linolenic, lanolic, isostearic and poly unsaturated fatty acids (PUFA) acids, g) higher alcohols such as lauryl, cetyl, steryl, oleyl, behenyl, cholesterol and 2-

3 o alcohol;
h) esters such as cetyl octanoate, myristyl lactate, cetyl lactate, isopropyl myristate, myristYl myristate, isopropyl palmitate, isopropyl adipate, butyl stearate, decyl oleate, cholesterol isostearate, glycerol monostearate, glycerol _ _ _ _ . . . . .

2l 90739

4 PCT/GB95/01687 istearate, glycerol tristearate, alkyl lactate for example lauryl lactate, alkyl citrate and alkyl tartrate;
i) essential oils such as ~ish oils, mentha, jasmine, camphor, white cedar, bitter orange peel, ryu, turpentine, r; nni , b~L~Iw~t, citrus unshiu, calamus, pine, lavender, bay, clove, hiba, eucalyptus, lemon, starflower, thYme, porpPrmint, rose, sage, menthol, cineole, eugenol, citral, citronelle, borneol, linalool, geraniol, evening primrose, camphor, thYmol~ q~irAntol~ pinene, 1 im~n~ne and ~erPenoid oils;
j ) lipids such as cholesterol, ceramides, sucrose esters and pseudo-cPrRmi ~9PC as described in European Patent Specification No. 556 957;
k) vitamins such as vitamin A and E, and vitamin alkyl esters, including those vitamin C alkyl esters;
1) sunscreens such as octyl methoxyl rinnA---tP (Parsol MCX) and butyl methoxy benzoylmP~hRn~ (Parsol 1789);
:n) Phosrhr~l i ri'lq; and n) mixtures of any of the ~oregoing componen~s.
The benefit agent may be incorporated in a carrier in the compositicns o~ the invention, particularly if it is likely to suffer detrimental interactionS with other c ^~tq of the composition. ~enefit agents for which such detrimental interactions may occur include lipids; alkyl lactates;
sunscreens; esters such as isopropyl palmitate and isopropyl myris~ate; and vitamins. The carrier can, for example, be a silicone or hydrocArbon oil which is not solubilised~
mi rPl l; qed by the surface active phase and in which the benef it agent is r~latively soluble .

2~ 90739 Wo 96/02224 PCr/GB95/01687 _ 5 _ Particularly preferred benefit agen~s include silicone oils, gums and modifica~ions thereof; esters such as isopropyl palmitate and myris~ate and alkyl lactates.
The benefit agent is preferably present in amount of from 0.1 to 15 wt%, most preferably from 0.2 to 10 wt96, more preferably from 0 . 5 to 7 wt9s An advantage of the composition according to the invention is that, during use, it deposits benefit agent onto the skin at a level which results in a perceivable benefit. Without being bound by theory, it is believed the benefit agent is dispersed into large pools during dilution of the composition in use and these pools deposit readily onto the skin.
In WO 94/01084 and WO 94/01085 compositions comprising large particles of petrolatum are structured by the presence of at least 5wt% insoluble fatty acid soaP. ~owever, it is believed such high levels of solid phase material may adversely affect the amount of benefit agent deposited onto the skin. Thus, in the present invention we require the composition to be subs~ntl ~1 ly free of insoluble fatty acid soap, by which is meant the level of insoluble fatty acid soap is below 1 wt& based on the composition.
Structurants are an essential feature of the present invention. Suitable structurants are those materials which when added to a composition, will increase the zero shear rate viscosity. They include swelling clays, for example laponite: fatty acid and derivatives thereof, in particular atty acid monoglyceride polyglycol ether: cross-linked polyacrylates such as Carbopol (TM) (polymers available from Goodrich): acrylates and copolymers thereof;

Wo96/02~24 2 1 90739 ~ C~ 7 polyvinylpyrrolidone and copolymers thereof; polyethylene imines; salts such as sodium chloride and ammonium sulphate:
sucrose esters; gellants; and mixtures thereof.
Of the clays particularly preferred are synthe~ic hectorite ( laponite) clay used in conjunction with an electrolyte salt capable of causing the clay ~o thicken so as to suspend the benefit agent. Suitable electrolytes include alkali and AlkAl;n~ earth salts such as halides, ammonium salts and sulphates.
Particularly preferred structurants include fatty acids and derivatives thereof and cross-linked polyacrylates.
1~7hilst some materials can function as both a benefit agent and structurant it will be a~preciated that the benefit and s~ructuring function cannot be provided by the same ~nt, }Iowever, it will be understood that where the composition comprises two or more benefit agents one of said benefit aqents may also unction as a structurant.
The compositions according to the invention may also comprise a thickening agent,~ i.e. a material which ~--int~;nq the viscosity of the composition as the shear rate thereof is increased during use. Suitable materials include cross-linked polyacryla~es such as Carbopol (TM) ~polymers available from Goodrich); fatty acid and derivatives thereof, in particular, fatty acid monoglyceride polyglycol ether;
natural gums including alginates, guar, xanthan and polysaccharide derivatives including car~oxy methyl ~ se and hydroxypropyl guar; propylene glycols and propylene glycol oleates; salts such as sodium chloride and ammonium sulpha~e; glycerol tallowates; and mixtures thereof.

Wo 96/02224 r~ ., 1687 Further examples of s~ruc~uran~s and thickeners are given in the International Cosmetic Ingredient Dictionary, Fifth Edition, 1993, pllhli ~h~rl by CTFA (The Cosmetic, Toiletry &
Fragrance Association~, incorporated herein by reference.

The surface active agent can be selected from any known surfactant suitable for topical application to the human body. Mild surfactanes, i . e . surfactants which do not damage the stratum corneum, the outer layer of the skin, are particularly preferred.
One preferred anionic detergent is fatty acyl icethi~n~te of formula:
RCO.CH.CH2503M
where R is an alkyl or alkenyl group of 7 to 21 carbon atoms and M is a solubilising cation such as sodium, potassium, ammonium or substituted ammonium. Preferably at least three quarters of the RCO groups have 12 to 18 carbon atomS and may be derived from coconut, palm or coconut~palm blends.
Anoeher preferred anionic detergent is alkyl ether sulphate of formula:
RO (Cl~3CH20) nSO,M
where R is an alkyl group of 8 to 22 carbon atoms, n ranges from 0 . 5 to 10, especially from 1. 5 to 8, and M is a solubilising cation as defined above.
Other possible anionic detergents include alkyl glyceryl ether sulphate, sulphosuccinates, taurates, sarcosinates, s~lrhr~AC~otates, alkyl phosphate, alkyl phosphate esters and acyl lacta~es, alkyl glutama~es and mixtures thereof.

W0 96/02224 1 ~ ,., 5 1687

5~ hnc~ ci n~t-~q may be monoalkyl sulphosuccinates having the f ormula: RsOaCCH2C~I ( S03M ) CO~M; and amido-MEA s- 1 ~hn5~ ~ r~ i n :~ tes of the formula: R;ceN~rT7-rFT~ (so3M)co~M; wherein Rs ranges-from C8-C20 alkyl, preferably Cl2-CI5 alkyl, and M is a sol--h; 1; qi "S cation.
Sarcnc;nAtPc are senerally i3}dicated by the fo_mula:
R5CON(C}I3~C~I2CO2M, wherein R5 ranges from C8-C20 alkyl, preferably C,2-CI5 alkyl and M is a sol~hi 1 i 5; n~ cation.
Taurates are generally identified by the formula:
R5CoNR6C}}2CH,so,M, wherein Rs ranges from C8-C20 alkyl, preferably Cl2-C,s alkyl, R6 ranges from C -C~ alkyl, and M is a solubilising cation.

~Iarsh surfactants such as primary alkane sulphonate or alkyl benzene sulphonate will generally be avoided.
Suitable nonionic surface active agents include alkyl polysaccharides, lactobinnAl33~ q, ethyleneglycol esters, glycerol monoethers, polyhydroxyamides (glucamide~, primary and seconda3-y alcohol ethoxylates, especially the C8-20 aliphatic A1Cn~hnlq ethoxylated with an average of from 1 to 20 moles of ethylene oxide per mole of alcohol.
The surface active agent is preferably present at a level o~
from 1 to 35 wt%, preferably 3 to 30 wt%.
It is also preferable that the composition includes from 0.5 to 15 wt% of a cosurfactant with skin-mildness benefits.
Suitable materials are zwitterionic detergents which have an alkyl or alkenyl group of 7 to 18 carbon atoms and comply with an overall structural formula 21 9~739 Wo 96/02224 r~ 7 _ g _ O R;

R; - 1 -C -NH ( CH~ N' - X-Y
R~
where Rl i9 alkyl or alkenyl of 7 to 18 carbon atoms ~
R' and R3 are each independently alkyl, hydroxyalkyl or carboxyalkyl of 1 to 3 carbon atoms;
m is 2 to 4 ~
n is 0 or l;
X is alkylene of 1 to 3 carbon atoms optionally substituted with hydroxyl; and Y is -CO2- or -SO,~
Zwitterionic deter~ents withirl the above general formula include si.-nple bGtAin~oc of formula:-Rl R' r~--CH2C02 and amido betaines of ~ormula:-- CONH(CH2~ CH2CO, R~
~ 3 5 ~here m is 2 or 3 .
In both formulae R', R2 and R~ are as defined previously.
R' maY, in particular, ~e a mixture of C~2 and C" alkyl grou~s derived from coconut so that at least half, pre~erably at _ _ _ _ _ , ... . _ . _ . _ . . .

2l 90739 Wo 96/02Z24 PCr/GB95101687 leas~ three quarters, of the group R1 has l0 to 14 carbon a~oms. R2 and R' are pre~erably methyl.
A further possibility is a sulphobetaine of formula:-Rl-li'- ( CH2 ) ,S,03 0 r~3 or R2 R1-CONH ~CH2) m ~~ (CH3~ ,SO, lS R' where m is 2 or 3, or variants of these in which -(C~2~3SO, is replaced by OH
-f'T~2~ Q, R;, Rl and R' in these formulae are as defined previously.

Furthermore, the benefit agent may also function as a carrier to deliver efficacy agents to skin treated with the compositions of the invention. ~his route is particularly useful for delivering efficacy agents which are difficult to deposit onto the skin or those which suffer detrimental interactions with other components in the composition. In such cases the carrier is a of ten a silicone or hydrocarbon oil which is not sol1~hil j Sed/micellised by the surface active phase and in which the efficacy agent is relatively soluble.
Examples o~ such efficacy agents include anti-viral agents;
hydroxycaprylic acias; pyrrolidone; carboxylic acids;
2,4,4~-trichloro-2'-hydroxydiphenyl ether (Irgasan DP300~;
3, 4, 4 ~ -trichlorocarbanilide; salicylic acid; benzoyl WO 96/02224 P~l,~.. ,,c,~ 7 peroxide; perfumes; essential oils; germicides and insect repellants such as N,N-dimethyl m-toluamide (DEET~; and mixtures thereof.
. .
Compositions of the inventlon may be formulated as products for washing the skin, for example bath or shower gels, hand washing compositions, facial,washing liquids; pre-and post-shaving products; rinse-of f, wipe-of f and leave-on skin care products .
The compositions of the invention will generally be pourable liouids or semi-liguids for example pastes and will preferably have a viscosity in the range 1000 to 100, 000 mPas measured at a shear rate of lOs~l at 25C in a E~aake Rotoviscometer RV20.
The compositions will exhibit a Newtonian viscosity at a shear stress of 0.01 Pa at 25C of at least 5,000 Pas preferably greater than 10, 000 Pas.
The abovo rionP~ characteristic viscosity mea~uL~ ~s may be determined exactly (as in the case of the non-zero shear viscosites) usin~, for example, a Carrimed CSL 100 low stress rheometer, or o~t~inpd from an extrapolation according to the Cross Model (see J of the Chemical Fn~inPPr, 1993, paper entitled "Rheology for the Chemical Engineer~' by H Barnes ) as in the case o~ the ero shear rate.
Other typical no"lrnnpnt~ of the compositions include opaci-- 30 fiers, preferably 0.2 to 2.0 wt%; preservatives, preferably 0 . 2 to 2 . 0 wt% and perfumes, pre~erably 0 . 5 to 2 . 0 wt~ .
According to a further aspect Df the invention there is provided a process for prepariny compositions according to the invention comprising:-WO 96/02224 ~ 1, ~., 168 a) struceuring the base ~ormulation comprising at least one surface active agent selected ~rom anionic, nonionic, zwitterionic, and cationic sur~ace active agents, and mixtures thereo~ with a structurant; and b) mixing the structured base ~r~r~ ti r~n with the benefit a6e~t .
The invention-will be ~urther illustrated by reference to the ~ollowing non-limiting examples.
Ex~mnlGe In the examples:-Alkylpolyglucoside was Plantaren 2000 ex Xenkel Coco amidopropyl betaine was Amonyl BA 380 ex Seppic.
Cross-linked polyacrylate was r~rhopol ETD 2020 ex Goodrich.
Fatty acid monoglyceride polyglycol ether was Rewoderm Ll580 ex Rewo.
Guar hydroxypropyl trimonium chloride was Jaguar C-13-S ex Meyhall.
Silicone oil emulsion was BC 92/057 ex R~qi l~lnn, ci 1 i C~nr~ oil was Dr200, a polydimethylsiloxane ex Dow Corninq with a viscosity of 60000 mPas.
Sodium lauryl ether sulphate was Genapol ZRO ex EIoechst Thickener was Antil 141 (a propylene glycol and propylene glycol oleate) ex Goldschmidt Fxr~lr,lr~q I-II
The following method was used to determine the amount of benef it agent deposlted onto ~ull thickness porcine skin ( 5 x 15 cm) treated with compositions according to the invention.

Wo 96/02224 ~ ,B _ 01687 The skin was prehydraced and then 0 . 5 ml of the product applied to it. The product was lathered for lO seconds and then rinsed for lO seconds under running water.
Thereafter the skin was wiped once with a paper towel to remove excess water.
2 minutes after drying a strip of adhesive tape was pressed onto the skin for 30 seconds by applying a constant load of lOOg.cm~2. The adhesive tape employed was J-Lar Superclear (T~) tape having a width of 2 . 5cm. In total ten strips of tape were applied to adjacent sites on the skin.
In this test procedure silicone which has deposited on the skin will 5 lhses~ nt ly be transferred to the tape along with some of the outer layer of the skin.
The amounts of silicon and skin ~dhering to the tape are determined by means of X-ray ~luorescence spectroscopy. The tape strips are placed in an X-ray fluorescence spectrometer with the adhesive side facing the beam of this machine. A
mask is applied over the tape to define a standardised area in the middle of the tape which is exposed to the X-ray beam.
The sample chamber of the machine is placed under vacuum before making measurements and the spectrometer is then used to measure the quantities of silicon and sulphur. The sulphur is representative of the amount of skin which has transferred to the tape.
The amounts of silicon and sulphur observed with a clean piece of adhesive tape are subtracted from the experimental measurements. The experimental mea~ , ~ s for the average levels of sulphur and silicon are expressed as a ratio of silicon to sulphur. From this ratio it is possible to determine silicone oil deposition per unit area of skin.

WO 96102224 PrL-r/GB95101687 7~ mn i e In this example deposition of silicon ~rom a composition comprising a sili cnn~ oil with a weight average size o~ 80 microns was ~7lotorminec7 and compared with that from a similar composition (composition A~ com7~7rising a sil; cnne oil emulsion having a weight average size of O . 5 micron.
A base shower-gel ~ormulation Elaving the following composition was prepared.
% 70v ~eir77~t Sodium lauryl ether sulphate 13 . O
Coco amidopropyl betaine 2 . O
Sorbic acid O . 37 Sodium citrate dihydrate O . 49 Fatty acid monoglyceride 7,aolyglycol ether 3 . 00 Citric acid -O . 01' Water + minors _ to 1000 ~ This level ca~ be varied to obtain a p.; for the composition of 5.~. ~
The v;scosity of the composition was 5500 mPas at 10s~l and 25C. ~
The base f orrn~ t i nn was prepared by mixing sodium lauryl ether sulphate and betaine. Thereafter the l tnin~J
r~n~70nonts were added with mixing.0 Two .;arvard 44 syringe pumps were used to infuse the base fnn-n-7i.o~tlnn and the benefit agent, silicone oil. silicone oil was present at a level of 5 wt% based on the total com7,70sit;on. One syringe was ~illed wi~h the base formu-3 5 lation and the other with silicone oil . The syringes were WO 96/02224 ~ .~. ''01687 then inserted into the syringe pum.p and the infusion rate set at 5:95 oil:bage. The oil and base were forced through a static in-line mixer and a composition with oil particles of the required size obtained. The size of the particles can be controlled by the ~;i t~r of the static mixer, the flow rate and length of the mixer ~ube. The size of the particles can be deteri~ined using a ~alver~ Mastersizer.
Comn~rative Comrosition (C~mnosition A) 1 0 %wt Sodium lauryl ether sulphate 13 . 00 Coco amidopropyl betaine (CAP~) 2 . 00 Silicone oil emulsion 5 . oo Guar hydroxypropyl trimonium 0.10 15 chloride Sorbic acid o . 37 SodiLm citrate dihydrate 0 . 49 Sodium chloride- 2 Citric acid- 0 . 01 20 Water + minors to 100 # level can be varied ln order eo give the required visco5ity of 5000 mPas at lOs~l and 25C.
level can be varied in order to give the rec~uired 25 pH.
Silicone deposition of these compositions were measured by the test procedure described above and the following results obtained .
si:s Example I 25 . 6 Comparison (A) 2 . 2 The results demonstrate the improved deposition achieved when the composition comprises large particle size silicone oil.

W096/02224 r~ll~,~.s!Q1697 FxA~ e TI
A base shower gel formulation having the fQllowing composition was prepared.
%wt Sodium lauryl ether sulphate 4. 00 Sodium coco amido propyl betaine 1. 00 10 Alkyl~olyglucoside 5 . 00 Sorbic acid 0 . 37 Trisodium citrate dihydrate 0 . 49 Cross-linked polyacrylate 0. 9 Thickener~
15 5N NaOH- -1 Water + minors to 100 ^ ^ Thickener was added to ~;ive the re~Iuired viscosity (-5000 mPas at 105-l and 25C)0 ~ 5N NaOH was added to adjust the pH of the composition to pH 5.3.
The bene~it agent used was si~ na oil with a viscosity of 25 60000 mPas.
The composition was prepared by dispersing the polyacrylate in excess water. Thereafter sorbic acid and trisodium citrate dihydrate were added to the resultin~ polymer dispersion. The three sur~ace active agents were mixed and the resulting mix added to the polymer dispersion.
Thereafter minors were added. The viscosity of the resulting composition was measured a~ a shear rate of 10s~l at 25C and thickener ~dded until the re~uired viscosi~y obtained.

Wo 96/02224 PCT/GB95/01687 The base formulation and silicone oil were infused using two Harvard 44 syringe pumps as described above. me viscosity of the final product was 5500 mPas.
Compositions comprising a number of different sized oil particles were prepared. Silicone deposition from these compositions was measured by the test ~rocedure described above and _ ~d with that ~rom composition ~A).
The following results were obtained:-Particle ~ize of Si: S ratio silicone oil 0.5 0.8 24 1.4 52 3.7 88 8.3 130 16. 8 138 18 . 1 The results demonstrate the bene~it of using large particle size bene~it agent.
The products were stored in a sealed glass vessel at 37C.
After 6 weeks they were still stable, i.e. there was no visible separation.
F~c~mnle III
~ 30 In this examPle the stability o~ a composition acoording to the invention structured with a cross-linked polyacrylate was compared with an identical composition ~rom which ehe structurant was absent.

WO 96/02224 1 9 0 7 9 PCrlGB95101687 The composition comprised wt Sodium lauryl ether sulphate 4. 00 Sodium coco amido propyl betaine 1. 00 Alkylpolyglucoside 5 . 00 Sorbic aci~i 0 . 37 Trisodium citrate dihydrate 0 . 49 Cross-linked polyacrylate 0.9#
Thickener ~ 97 10 Water + minors to 100 5N NaOH was added to adjust the pH of the composition to pH 5.3.
# absent from the comparative frrm ll ~t j on.
The benefit agent used was silicone oil present in an amount of 5wt%.
The viscosity of the product ~crrr~l; nrJ to the invention and o~ the comparison were, respectively, 4628 and 5500 mPas at 105-l and 25C and 22783 and 12.16 mPas at 0.01 Pa and 25C.
Both compositions were stored in sealed glass vessels and placed in a oven at 37C.
Whereas the comparative composition separated after three days the composition according to the invention was still stable after 4 weeks.

Claims

1. An aqueous liquid cleansing and moisturising composition comprising: -a) a surface active agent selected from anionic, nonionic, zwitterionic, and cationic surface active agents, and mixtures thereof;
b) a benefit agent having a weight average particle size in the range 50 to 500 microns; and c) at least one structurant;
wherein the composition is substantially free of insoluble fatty acid soap and has a viscosity of at least 5,000 Pas at a shear stress of 0.01 Pa at 25°C.

2. A composition according to claim 1 wherein the structurant is selected from swelling clays; fatty acid and derivatives thereof; cross-linked polyacrylates; acrylates and copolymers thereof; polyvinylpyrrolidone and copolymers thereof; polyethylene imines; salts; sucrose esters; gellants; and mixtures thereof.

3. A composition according to claim 1 wherein the benefit agent is selected from silicone oils; gums; fats; oils;
waxes: hydrophobic plant extracts; hydrocarbons; higher fatty acids: higher fatty alcohols; esters; essential oils; lipids;
phospholipids; vitamins; sunscreens; and mixtures thereof.

4. A composition according to any one of the preceding claims comprising 0.1 to 15 wt% of the benefit agent.

5. A composition according to any one of the preceding claims wherein the benefit agent functions as a carrier to deliver efficacy agents to skin treated with the composition.

6. A composition according to any one of the preceding claims comprising 1 to 35 wt% of the surface active agent.

7. A process for preparing a composition according to claim 1 comprises:-a) structuring the base formulation comprising at least one surface active agent selected from anionic, nonionic, zwitterionic and cationic surface active agents and mixtures thereof; and b) mixing the structured base formulation with the benefit agent.

8. A method of depositing a benefit agent from an aqueous liquid cleansing and moisturising composition, the method comprising providing the benefit agent in a composition comprising a) a surface active agent selected from anionic, nonionic, zwitterionic, and cationic surface active agents, and mixtures thereof;
b) the benefit agent having a weight average particle size in the range 50 to 500 microns; and c) at least one structurant;
the composition being substantially free of insoluble fatty acid soap and having a viscosity of at least 5,000 Pas at a shear stress of 0.01 Pa at 25°C.