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US 8,138,134 B2Granted
Quaternized cellulose ethers for personal care products
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsXiaodong Zhang, Russell L. Kreeger, Edward F. Diantonio, Wing K. Li, Tatiana Drovetskaya
Life of this patent
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Abstract
Quaternized cellulose ethers suitable for personal care products are described.
Claims9
A personal care composition, comprising:
- a combination of surfactants, comprising at least two of ammonium laureth sulfate, sodium laureth sulfate, and cocamidopropyl betaine;
- and
- at least one derivatized quaternized hydroxyethyl cellulose ether, selected such that the quaternized cellulose ether comprises fewer than 4000 anhydroglucose repeat units, an average substitution level of hydrophobic substituents, comprising an alkyl, alkylaryl or arylalkyl group having 8 to 30 carbon atoms, from about 0.005 to about 0.3 moles of substituent per mole of anhydroglucose unit, a nitrogen percentage from about 0.3 to about 3.0, provided that the average substitution level of hydrophobic substituents is less than the average substitution level of cationic substituents;
- and
- with the proviso that the personal care composition does not contain methyl glucose dioleate.
2 more elements
A method for increasing the viscosity of a personal care composition comprising at least two of ammonium laureth sulfate, sodium laureth sulfate, and cocamidopropyl betaine without concommitant increases in stringiness and reduced spreadability, comprising:
- selecting for addition to such personal care composition at least one derivatized quaternized hydroxyethyl cellulose ether, wherein the quaternized cellulose ether comprises fewer than 4000 anhydroglucose repeat units, an average substitution level of hydrophobic substituents, comprising an alkyl, alkylaryl or arylalkyl group having 8 to 30 carbon atoms, from about 0.005 to about 0.3 moles of substituent per mole of anhydroglucose unit, a nitrogen percentage from about 0.3 to about 3.0, provided that the average substitution level of hydrophobic substituents is less than the average substitution level of cationic substituents;
- and combining the derivatized quaternized hydroxyethyl cellulose ether with the personal care composition, provided that the personal care composition does not contain methyl glucose dioleate.
Dependencies are inferred from the claim text.