Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-04-16
2001-11-27
Jones, Dameron L. (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000, C424S070900, C424S070210, C424S070190, C424S070220
Reexamination Certificate
active
06322799
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to personal wash cleanser compositions comprising an &agr;-hydroxy benefit agent which in turn comprises mixtures of both short chain (C
1
-C
12
) and long chain (C
14
-C
24
) &agr;-hydroxy acid esters. More specifically, by combining the longer term moisturizing effect of short chain esters, (note, short chain esters such as ethyl (S)-, butyl (S)- or octyl (S)-lactate often have initial drying effect) with the shorter term moisturizing/masking benefit of long chain esters (e.g., octadecyl (S)-lactate), applicants have obtained superior compositions. Mixing both short and long term moisturizing effects allows compositions to be prepared which have long term beneficial effects while providing short term visual tactile effects of soft, smooth skin. More specifically, applicants have been able to mix short chain esters (normally drying) with long chain esters and significantly reduce the drying effect of the short chain esters while providing longer term moisturizing effects associated with the shorter chain esters.
The use of short chain &agr;-ahydroxy acid esters (e.g., C
1
to C
4
alkyl lactates to treat acne) or long chain &agr;-hydroxy acid esters (e.g., long chain lactate ester emollient) is broadly taught in the art. No art, however, teaches a specific combination of long and short chain esters of &agr;-hydroxy acid (e.g., lactic acid) or that, in combination, the long and short chain esters could provide multiple benefit.
Typical of this art is U.S. Pat. No. 4,540,567 to Oneto et al. (assigned to Lever Brothers), which teaches compositions comprising short chain C
1
-C
4
lactate (primarily for treatment of acne) or mixtures which are dissolved in a mixture of water and water-miscible C
2
-C
4
alkylene glycol or a polymer thereof. Alkylene glycol is said to act as a vehicle to help limit dehydration of skin and improve sensory feel of product. There is no teaching or suggestion of combining with long chain &agr;-hydroxy acid esters or that by doing so dehydration effect can be ameliorated.
It is thus one object of the invention to provide a unique composition which provides the long term moisturizing benefits provided by short chain length &agr;-hydroxy acids while at the same time masking the short term dryness often caused by the short chain esters by using long chain esters of &agr;-hydroxy acids to provide short term moisturizing benefits.
BRIEF SUMMARY OF THE INVENTION
Suddenly and unexpectedly, applicants have found that specific mixtures of short chain and long chain &agr;-hydroxy acid esters provide dual benefit (short and long term moisturizing benefit) previously difficult or impossible to obtain.
More specifically, the invention relates to personal wash compositions comprising:
(a) 0% to 90% by wt. composition of a surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic surfactants and mixtures thereof; and
(b) 1% to 25% by wt. composition, preferably 1% to 15% by wt. of a benefit agent composition comprising:
(i) 0.01% to 10% branched or unbranched, saturated or unsaturated, straight or cyclic C
1
to C
12
&agr;-hydroxy acid esters; and
(ii) 0.01% to 10% branched or unbranched, saturated or unsaturated, straight or cyclic C
13
to C
24
, preferably C
14
to C
22
&agr;-hydroxy acid esters; and
(iii) balance water
wherein said benefit agent composition (b) comprises at least 0.5% combined elements (i) and (ii).
In one embodiment, the composition is a liquid personal wash composition comprising:
(a) 5 to 60%, preferably 10 to 40% by wt. surfactant;
(b) 1 to 25%, preferably 1 to 15% by wt. &agr;-hydroxy mixture benefit agent composition;
(c) 0 to 25%, preferably 1 to 15% by wt. structurant;
(d) 0 to 15% by wt. thickening or thinning agent;
(e) 1 to 20% by wt. additional emollient; and
(f) balance water.
In a second embodiment of the invention, the composition is a cosmetic composition comprising:
(a) 0 to 30% by wt., preferably 1 to 15% surfactant;
(b) 1 to 25% &agr;-hydroxy acid mixture benefit agent composition; and
(c) 0.01 to 90% by wt. of a cosmetic composition comprising:
(i) optional actives (e.g., sunscreens, tanning aids);
(ii) optional essential fatty acids;
(iii) 0.5 to 50% by wt. total composition emollient;
(iv) 0 to 20% by wt. total composition thickener.
REFERENCES:
patent: 4224339 (1980-09-01), Van Scott et al.
patent: 4234599 (1980-11-01), Van Scott et al.
patent: 4529605 (1985-07-01), Lynch et al.
patent: 4540567 (1985-09-01), Oneto et al.
patent: 5002680 (1991-03-01), Schmidt et al.
patent: 5180579 (1993-01-01), Birtwistle et al.
patent: 5961992 (1999-10-01), Ilardi et al.
patent: 5989533 (1999-11-01), Deegan et al.
patent: 95/05160 (1995-02-01), None
A Study to Assess the Moisturizing Keratolytic, Antiacne and Antiageing Effect of Alpha-Alpha-Hydroxy Acid Esters by L. Celleno et al., pp. 277-308.
Chemical Pharmacy Bulletin 38(1990) pp. 2877-2879—Enhancing Effects of Myristyl Lactate and Lauryl Lactate on Percutaneous Absorption of Indomethacin in Rats by Dohl et al. (Chemical Abstract vol. 114, 1991).
British Journal of Dermatology(1784) 110, pp. 475-485—The Mode of Action of Ethyl Lactate as a Treatment for Acne by Prottey et al.
Aronson Michael Paul
Ilardi Leonora
Weinkauf Ronni Lynn
Jones Dameron L.
Koatz Ronald A.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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