Preparation of copolymers which form clear aqueous solutions

Details Preparation of copolymers which form clear aqueous solutions Preparation of copolymers which form clear aqueous solutions

C - Chemistry, Metallurgy

08

F

402/480

C08F 2/06 (2006.01) C08F 6/00 (2006.01) C08F 218/04 (2006.01) C08F 226/10 (2006.01)

Patent

CA 2025043

O.Z. 0050/41114 Abstract of the Disclosure: The preparation of copolymers which form clear aqueous solutions from A) 45 to 90 % by weight N-vinylpyrrolidone, B) 10 to 55 % by weight of a vinyl ester and C) 0 to 10 % by weight of other copolymerizable mono- mers by radical polymerization in an organic solvent in the presence of a radical initiator, and removal of the organic solvent and other volatiles by distillation, entails allowing the polymerization to proceed until the N-vinylpyrrolidone content in the reaction mixture is from 5 to 1 % by weight of the N-vinylpyrrolidone amount employed, substantially removing the organic solvent and other volatile by distillation, adding water to the mixture, again adding a radical initiator and leaving the aqueous solution at from 50 to 100°C for from 1 to 10 hours, and then removing volatile organic constituents virtually completely by a steam distillation.

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