Patent ID: 9310678
Filing Date: 2016-04-12
CPC Classification: C08F,G03F

Claim Text:
1. The process for preparing a vinyl ether group-containing copolymer wherein the copolymer is composed of the structural units represented by the following general formulae I, II and III, wherein R R n is a positive integer of 1-4, the molar numbers of the structural units represented by the general formulae I, II and III are x, y and z, respectively, and x:y:z=3-8:1-4:1-5, and the weight average molecular weight of the copolymer is 5000-20000, the process comprises the steps of: (1) copolymerizing methacrylic acid, a methacrylate represented by the following general formula VI and methacryloyl chloride to obtain a copolymer 1; (2) adding a vinyl ether represented by the following general formula V into the copolymer 1 to obtain the vinyl ether group-containing copolymer, wherein R R n is a positive integer of 1-4, wherein the step (1) is performed by reacting methacrylic acid, the methacrylate represented by the general formula VI and methacryloyl chloride, in the presence of an initiator, at 50-90° C. for 8-20 hours to obtain the copolymer 1; and the step (2) is performed by adding dropwise the vinyl ether represented by the general formula V into the copolymer 1 at 35-50° C. over 1-3 hours and then reacting for 5-20 hours to obtain the vinyl ether group-containing copolymer.