Cosmetic compositions containing biodegradable cellulose ester microparticles
AssigneeEastman Chemical Company
InventorsHassan Alomgir Ali, Chloe Beaume, Brajesh Jha, Matt Stephens, Jung Hyun Park, Leslie Taylor Baker, Sharmistha Mazumder, Robert David Pace, Kenny Randolph Parker
Life of this patent
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Abstract
Cosmetic compositions comprising biodegradable microparticles formed from biodegradable mixed cellulose esters are provided. More particularly, cosmetic compositions are provided that contain environmentally friendly cellulose-based microparticles, which can be used in a wide array of cosmetic and personal care applications, and provide enhanced cosmetic attributes.
Claims30
A cosmetic composition comprising biodegradable microparticles, wherein the biodegradable microparticles comprise a mixed cellulose ester,
- wherein the biodegradable microparticles exhibit at least 50 percent biodegradability at 60 days according to at least one of the OECD 301B, OECD 301C, or OECD 301F test methods,
- wherein the mixed cellulose ester comprises—
- (a) an average degree of substitution for acetyl substituents (“DSAc”) in the range of 0.1 to 2.3,
- (b) an average degree of substitution for propionyl substituents (“DSPr”) or an average degree of substitution for butyryl substituents (“DSBu”) in the range of 0.1 to 0.5, and
- (c) an average degree of substitution for hydroxyl substituents (“DSOH”) in the range of 0.6 to 2.8.
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A cosmetic composition comprising 0.5 to 15 weight percent of biodegradable microparticles, wherein the biodegradable microparticles comprise a mixed cellulose ester,
- wherein the biodegradable microparticles exhibit at least 50 percent biodegradability at 60 days according to at least one of the OECD 301B, OECD 301C, or OECD 301F test methods,
- wherein the biodegradable microparticles have an average BET surface area in the range of 0.1 to 15 m2/g,
- wherein the mixed cellulose ester comprises—
- (a) an average degree of substitution for acetyl substituents (“DSAc”) in the range of 1.5 to 2.3,
- (b) an average degree of substitution for butyryl substituents (“DSBu”) in the range of 0.1 to 0.3, and
- (c) an average degree of substitution for hydroxyl substituents (“DSOH”) in the range of 0.7 to 1.1.
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A process for forming a cosmetic composition, the process comprising:
- (a) providing a plurality of biodegradable microparticles comprising a mixed cellulose ester, wherein the biodegradable microparticles exhibit at least 50 percent biodegradability at 60 days according to at least one of the OECD 301B, OECD 301C, or OECD 301F test methods, wherein the mixed cellulose ester comprises—
- (i) an average degree of substitution for acetyl substituents (“DSAc”) in the range of 1.5 to 2.3,
- (ii) an average degree of substitution for propionyl substituents (“DSPr”) or an average degree of substitution for butyryl substituents (“DSBu”) in the range of 0.1 to 0.3, and
- (iii) an average degree of substitution for hydroxyl substituents (“DSOH”) in the range of 0.7 to 1.1;
- and
- (b) combining the biodegradable microparticles with one or more cosmetic additives to thereby form a pre-cosmetic mixture;
- and
- (c) forming the cosmetic composition from the pre-cosmetic mixture,
- wherein the cosmetic composition comprises at least 2 weight percent of the biodegradable microparticles.
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Dependencies are inferred from the claim text.