(Meth)acrylic polymers, method for making same and use thereof as pigment dispersant
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United States of America Patent
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Mar 21, 2000
Grant Date -
N/A
app pub date -
Sep 18, 1998
filing date -
Aug 24, 1995
priority date (Note) -
Expired
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Abstract
(Meth)acrylic copolymers of general formula ##STR1## in which: the M.sup.+ are monovalent cations arising from the neutralization of the --COOH groups, it being possible, however, for this neutralization to have been only partial; R.sub.1 and R.sub.2 are chosen from: hydrogen, long-chain linear or branched cycloalkyl or alkyl radicals and aryl radicals having from 8 to approximately 22 carbon atoms, with the condition that at least one of R.sub.1 and R.sub.2 is not hydrogen; R.sub.3 and R.sub.4 are independently chosen from: the hydrogen atom, short-chain cycloalkyl or alkyl radicals having from 1 to 7 carbon atoms and aryl radicals having from 6 to 7 carbon atoms; R.sub.5, R.sub.6, and R.sub.7 are each, independently of one another, chosen from the hydrogen atom and the methyl radical; .tau..sub.1 is the molar level of long-chain amide units in the copolymer; and .tau..sub.2 is the molar level of short-chain amide units optionally present in the copolymer. Their weight-average molar mass does not exceed 30,000 and .tau..sub.1 is between 0.01 and 0.30.
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