Preparation of terpolymers

Details Preparation of terpolymers Preparation of terpolymers

C - Chemistry, Metallurgy

08

F

402/410

C08F 220/56 (2006.01) C08F 6/00 (2006.01) C08F 220/54 (2006.01)

Patent

CA 1326935

ABSTRACT A process is disclosed for the preparation of a terpolymer of from 46 to 56% by weight of N-tert-butylacrylamide, from 37 to 45% by weight of ethyl acrylate and from 6 to 9% by weight of acrylic acid, the percentages being based on the weight of the monomers, wherein a suspension polymerization is carried out in which a) the monomers are introduced individually or as a mixture, with stirring, into water which contains from 0.05 to 1.5% by weight of a protective colloid and from 0.1 to 1.0% by weight of a regulator, the percentages being based on the total weight of the monomers, so that a 25-50% strength by weight mixture is formed, b) the resulting, stirred mixture is heated to 60-80°C and stirred at this temperature for from 15 minutes to 1 hour until a homogeneous emulsion has formed, c) from 0.1 to 1.0% by weight of initiator, based on the total weight of the monomers, is then metered in in the course of from 1 to 9 hours in such a way that a polymerization temperature of from 70 to 100°C is maintained, and d) after the subsequent complete polymerization, the resulting terpolymer having a molecular weight of from 20,000 to 80,000 is filtered off, washed with water and dried.

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