Crosslinked polyacrylic acids having low solvent residue, a process for the preparation thereof and the use thereof as thickening agents
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United States of America Patent
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Aug 30, 1994
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N/A
app pub date -
Aug 25, 1993
filing date -
Aug 25, 1993
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Expired
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Abstract
A crosslinked acrylic acid polymer or crosslinked acrylic acid copolymer consisting of at least 80% of acrylic acid and containing less than 5 ppm of methylene chloride obtained by a process comprising the radicalic polymerization of monomers in a solvent mixture consisting of a mixture of methylene chloride and a carboxylic ester having formula R--COO--R.sub.1 wherein R is hydrogen, methyl or ethyl group, R.sub.1 is C.sub.1 -C.sub.3 alkyl group, wherein said solvent mixture consists of 60-75% v/v of methylene chloride and 40-25% v/v of carboxylic ester, or, alternatively, dimethyl or diethylcarbonate is used instead of the carboxylic ester, together with a cross-linking agent, in an amount from 0.3 and 4% w/w, calculated on the monomer, and an appropriate free radical initiator as catalyst at a temperature ranging from 35.degree. C. and reflux temperature. The polymers and copolymers are useful as thickening agents for cosmetic and pharmaceutical formulations.
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