Copolymer acting as thickening agent for aqueous preparations having a pH above 5.5, a method for its preparation and its use as a thickening agent
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United States of America Patent
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Feb 4, 1992
Issued Date -
N/A
app pub date -
Jan 31, 1991
filing date -
Jul 29, 1989
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Abstract
A copolymer is disclosed which acts as a thickening agent for aqueous preparations having a pH of more than 5.5. The copolymer is obtainable by emulsion polymerization in an aqueous medium, at a pH of 2.5 to 5, in the presence of an initiator forming free radicals, at a temperature of 60.degree. to 95.degree. C. of 10 to 50% by weight of acrylic or methacrylic acid, 25 to 75% by weight of a nonionic vinyl monomer and 2 to 50% by weight of a macromonomer of the formula CH.sub.2 .dbd.CR--CH.sub.2 --O--(C.sub.n H.sub.2n O).sub.a (C.sub.m H.sub.2m O).sub.b (C.sub.p H.sub.2p O).sub.c H wherein R is H or CH.sub.3 n, p are the same or different and in each case are 2 or 3, with the proviso that n and p have a value of not more than 2.3 in the average molecule, m=a whole number from 12 to 18 a=10 to 100, b=2 to 10, c=0 to 10 and wherein the sum of the monomers amounts to 100% by weight.
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