Polyesters based on hydroxy fatty acids and lower hydroxy alkyl acids and uses thereof
AssigneeEthox Chemicals, LLC
InventorsPaul David Weipert, Bharat B. Desai
Life of this patent
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Abstract
The present invention provides biodegradable polyesters based on lower hydroxy acids and hydroxy fatty acids. The resulting polyesters are useful as cosmetic vehicles for sunscreens, skin lotions and by themselves are also useful as milder skin exfoliants.
Claims13
A biodegradable polyester of the formula:
- 16
- wherein R1 is selected from the group consisting of hydrogen and C1-5 alkyl;
- m and n are independently integers from 1 to 100;
- m+n is an integer from 2 to 100 and wherein the ratio of m:n is from about 80:20 to about 20:80.
A biodegradable polyester of the formula:
- 17
- wherein R1 is selected from the group consisting of hydrogen and C1-5 alkyl;
- R2 is selected from the group consisting of hydrogen and hydroxy;
- and R3 is selected from the group consisting of hydrogen and C1-5 alkyl;
- m and n are independently integers from 1 to 100;
- m+n is an integer from 2 to 100 and wherein the ratio of m:n is from about 80:20 to about 20:80.
A biodegradable polyester of the formula:
- 18
- wherein R1 and R2 are selected from the group consisting of hydrogen and C1-5 alkyl;
- m and n are independently integers from 1 to 100, m+n is an integer from 2 to 100 and wherein the ratio of m:n is from about 80:20 to about 20:80.
A polyester of the formula
- 19
- wherein R1 is selected from the group consisting of amino, carboxyl and hydrogen;
- m+n is an integer from 2 to 100 and wherein the ratio of m:n is from about 80:20 to about 20:80.
A delivery vehicle for applying cosmetic or functional active ingredients to human skin, said delivery vehicle comprising 50 to 99.5 weight percent a polyester according to claim 1 and 0.5 to 50 weight percent of a cosmetic or functional active material selected from the group consisting of emollients, sunscreens, vitamins, humectants, botanicals, insect repellents, skin protectants, antiperspirants, bactericides, antiseptics, moisturizers, antioxidants, buffers, pigments, colorants, dyes, fragrances, titanium dioxide, talc, and combinations thereof.
A method for treating skin wrinkles and aging of the skin which method comprises topically applying to said skin an effective amount of an alpha or beta hydroxy acid polyester selected from the group consisting of poly[(lactic acid)-co-(ricinoleic acid)], poly[(glycolic acid)-co-ricinoleic acid)], poly[(salicylic acid)-co-(ricinoleic acid)] and their hydrogenated derivatives in a cosmetically acceptable carrier.
Dependencies are inferred from the claim text.