C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/305
C08F 220/04 (2006.01) C08F 222/02 (2006.01)
Patent
CA 1243446
Abstract of the Disclosure: In a process for the prepara- tion of copolymers which contain monoethylenically unsatu- rated monocarboxylic acids and dicarboxylic acids as co- polymerized monomer units, by copolymerizing the monocar- boxylic acids with the dicarboxylic acids or, where appropriate, their inner anhydrides, in an aqueous medium in the presence of a water-soluble initiator, the improve- ment that a) from 10 to 60% by weight, based on the sum of the mono- mers, of a monoethylenically unsaturated dicarboxylic acid of 4 to 6 carbon atoms, its alkali metal salt or, where appropriate, its anhydride, b) from 90 to 40% by weight of a monoethylenically unsatu- rated monocarboxylic acid of 3 to 10 carbon atoms or its alkali metal salt and c) from 0 to 20% by weight of another monoethylenically unsaturated monomer, which is free from carboxyl groups and is copolymerizable with a) and b) are copolymerized in an aqueous medium in the presence of from 0.5 to 5% by weight, based on monomers, of the water- soluble initiator by introducing the dicarboxylic acid, its salt or its anhydride into the aqueous medium, adding the monocarboxylic acid together with the initiator over from 3 to 10 hours, completing the reaction at 60 - 150°C and, where appropriate, hydrolyzing the anhydride groups.
412285
Denzinger Walter
Hartmann Heinrich
Hettche Albert
Raubenheimer Hans-Juergen
Schneider Rolf
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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