Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2002-05-14
2002-12-17
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C060S400000, C060S401000, C060S039440, C060S039440
Reexamination Certificate
active
06495123
ABSTRACT:
BACKGROUND TO THE INVENTION
1. Field of the Invention
The invention concerns cosmetic compositions of improved aesthetic properties having low pH and containing organic sunscreen agents.
2. The Related Art
Sunscreen agents are commonly used in compositions intended for cosmetic application to the face and other exposed skin areas. These preparations are formulated as creams, lotions or oils containing as the agent an organic ultraviolet radiation absorbing chemical compound. The agent blocks passage of erythematogenic radiation thereby preventing its penetration into the skin.
High quality skinfeel properties are not always easy to achieve where the compositions contain sunscreen agents. The challenge is especially magnified with low pH systems. Organic sunscreens often have a sticky or tacky feel. These attributes must be counteracted when formulated into an aqueous emulsion composition. Formulating an aesthetically pleasant system incorporating these actives remains a challenge to chemists.
Sunscreen compositions have been well documented in the patent literature. For instance, U.S. Pat. No. 5,505,935 (Guerrero et at.) discloses sunscreen compositions wherein ethylene/vinyl acetate copolymer and poly(methyl methacrylate) particles were found useful as boosters for the sun protection factor (SPF).
Accordingly, it is an advantage of the present invention to provide an organic sunscreen agent formulated cosmetic composition with improved skinfeet, especially one with low tackiness.
Another advantage of the present invention is to provide a sunscreen agent formulated cosmetic composition that is an aqueous emulsion of low pH having good skinfeel properties.
These and other advantages of the present invention will become more apparent from consideration of the summary and detailed discussion which follows.
SUMMARY OF THE INVENTION
A cosmetic composition is provided which includes:
(i) from about 0.1 to about 15% by weight of an organic sunscreen agent having a chromophoric group active within the ultraviolet radiation range from 290 to 400 nm;
(ii) from about 0.01 to about 10% by weight of a water-insoluble powdered polymer formed as porous particles having an Oil Absorbance (castor oil) value ranging from about 90 to about 500 ml/100 gm; and
(iii) from about 1 to about 99% of water, the composition having a pH of less than 7.
DETAILED DESCRIPTION OF THE INVENTION
Now it has been found that water-insoluble polymeric powders in porous particle form can modify the tacky skinfeel normally associated with organic sunscreen agents. Excellent skinfeel without any perceptible tackiness is achieved, even in systems having extremely low pH.
A first element of compositions according to the present invention is that of a water-insoluble material in the form of polymeric porous spherical particles. By the term “porous” is meant an open or closed cell structure. Preferably the particles are not hollow beads. Average particle size may range from about 0.1 to about 100, preferably from about 1 to about 50, more preferably greater than 5 and especially from 5 to about 15, optimally from about 6 to about 10 micron. Organic polymers or copolymers are the preferred materials and can be formed from monomers including the acid, salt or ester forms of acrylic acid, methacrylic acid, methylacrylate, ethylacrylate, ethylene, propylene, vinylidene chloride, acrylonitrile, maleic acid, vinyl pyrrolidone, styrene, butadiene and mixtures thereof. The polymers are especially useful in cross-linked form. Cells of the porous articles may be filled by a gas which can be air, nitrogen or a hydrocarbon. Oil Absorbance (castor oil) is a measure of porosity and may range from about 90 to about 500, preferably from about 100 to about 200, optimally from about 120 to about 180 ml/100 grams. Density of the particles may range from about 0.08 to 0.55, preferably from about 0.15 to 0.48 g/cm
3
.
Illustrative porous polymers include polymethylmethacrylate and cross-linked polystyrene. Most preferred is polymethyl methacrylate available as Ganzpearl® 820 available from Presperse, Inc., Piscataway, N.J., known also by its INCI name of Methyl Methacrylate Crosspolymer.
Amounts of the water-insoluble polymeric porous particles may range from about 0.01 to about 10%, preferably from about 0.1 to about 5%, optimally from about 0.3 to about 2% by weight of the composition.
A second element of compositions according to the present invention is that of an organic sunscreen agent having at least one chromophoric group absorbing within the ultraviolet ranging from 290 to 400 nm. Chromophoric organic sunscreen agents may be divided into the following categories (with specific examples) including: p-Aminobenzoic acid, its salts and its derivatives (ethyl, isobutyl, glyceryl esters; p-dimethylaminobenzoic acid); Anthranilates (o-aminobenzoates; methyl, menthyl, phenyl, benzyl, phenylethyl, linalyt, terpinyl, and cyclohexenyl esters); Salicylates (octyl, amyl, phenyl, benzyl, menthyl, glyceryl, and dipropyleneglycol esters);
Cinnamic acid derivatives (menthyl and benzyl esters, alpha-phenyl cinnamonitrile; butyl cinnamoyl pyruvate); Dihydroxycinnamic acid derivatives (umbelliferone, methylumbelliferone, methylaceto-umbelliferone); Trihydroxycinnamic acid derivatives (esculetin, methylesculetin, daphnetin, and the glucosides, esculin and daphnin); Hydrocarbons (diphenylbutadiene, stilbene); Dibenzalacetone and benzalacetophenone; Naphtholsulfonates (sodium salts of 2-naphthol-3,6-disulfonic and of 2-naphthol-6,8-disulfonic acids); Dihydroxy-naphthoic acid and its salts; o- and p-Hydroxybiphenyldisulfonates; Coumarin derivatives (7-hydroxy, 7-methyl, 3-phenyl); Diazoles (2-acetyl-3-bromoindazole, phenyl benzoxazole, methyl naphthoxazole, various aryl benzothiazoles); Quinine salts (bisulfate, sulfate, chloride, oleate, and tannate); Quinoline derivatives (8-hydroxyquinoline salts, 2-phenylquinoline); Hydroxy- or methoxy-substituted benzophenones; Uric and vilouric acids; Tannic acid and its derivatives (e.g., hexaethylether); (Butyl carbityl) (6-propyl piperonyl) ether; Hydroquinone; Benzophenones (Oxybenzone, Sulisobenzone, Dioxybenzone, Benzoresorcinol, 2,2′, 4,4′-Tetrahydroxybenzophenone, 2,2′-Dihydroxy-4,4′-dimethoxybenzophenone, Octabenzone; 4-lsopropyldibenzoylmethane; Butylmethoxydibenzoylmethane; Etocrylene; and 4-isopropyl-dibenzoylmethane).
Particularly useful are: 2-ethylhexyl p-methoxycinnamate, 4,4′-t-butyl methoxydibenzoylmethane, 2-hydroxy-4-methoxybenzophenone, octyidimethyl p-aminobenzoic acid, digalloyLtrioleate, 2,2-dihydroxy-4-methoxybenzophenone, ethyl 4-[bis(hydroxypropyt)]aminobenzoate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, 2-ethythexylsalicytate, glyceryl p-aminobenzoate, 3,3,5-trimethytcyclohexylsaticylate, methylanthranitate, p-dimethylaminobenzoic acid or aminobenzoate, 2-ethylhexyl p-dimethylaminobenzoic, 2-phenytbenzimidazole-5-sulfonic acid, 2-(p-dimethylaminophenyl)-5-sulfoniobenzoxazoic acid and mixtures thereof.
Suitable commercially available organic sunscreen agents are those identified under the following table.
TABLE I
CTFA NAME
TRADE NAME
SUPPLIER
Benzophenone-3
UVINUL M-40
BASF Chemical Co.
Benzophenone-4
UVINUL MS-40
BASF Chemical Co.
Benzophenone-8
SPECTRA-SORB UV-24
American Cyanamid
DEA-Methoxycinnamate
BERNEL HYDRO
Bernel Chemical
Ethyl
AMERSCREEN P
Amerchol Corp.
dihydroxypropyl-PABA
Glyceryl PABA
NIPA G.M.P.A.
Nipa Labs.
Homosatate
KEMESTER HMS
Humko Chemical
Menthyl anthranilate
SUNAROME UVA
Fetton Worldwide
Octocrylene
UVINUL N-539
BASF Chemical Co.
Octyl dimethyl PABA
AMERSCOL
Amerchol Corp.
Octyl methoxycinnamate
PARSOL MCX
Bernel Chemical
Octyl salicylate
SUNAROME WMO
Fetton Worldwide
PABA
PABA
National Starch
2-Phenylbenzimidazole-
EUSOLEX 232
EM Industries
5-sulphonic acid
TEA salicylate
SUNAROME W
Fetton Worldwide
2-(4-Methylbenzylidene)-
EUSOLEX 6300
EM Industries
camphor
Benzophenone-1
UVINUL 400
BASF Chemical Co.
Benzophenone-2
UVINUL D-50
BASF Chemical Co.
Benzophenone-6
UVINUL D-49
BASF Chemical Co.
Benzophenone-12
UVINUL 408
BASF Che
Cheney Michael Charles
Faryniarz Joseph Raymond
Suares Alan Joseph
Zhang Joanna Hong
Dodson Shelley A.
Honig Milton L.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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