公开(公告)号：US5191008A

公开(公告)日：1993-03-02

申请号：US779666

申请日：1991-10-21

申请人： Howard H. Frost ,  Pamela S. Graham ,  Ronald D. Fiedler ,  Ramesh N. Gujarathi

发明人： Howard H. Frost ,  Pamela S. Graham ,  Ronald D. Fiedler ,  Ramesh N. Gujarathi

IPC分类号： C08F2/16 ,  C08F236/04

CPC分类号： C08F236/04

摘要： The present invention relates to a free radical emulsion polymerization process. The latex is prepared by polymerizing (a) at least one conjugated diene, (b) at least one non-carboxylic vinyl aromatic or aliphatic comonomer selected from the group consisting of styrene, .alpha.-methyl styrene, p-methyl styrene, vinyl toluene, acrylonitrile, methacrylonitrile, vinylidene chloride, ethyl acrylate, butyl acrylate, vinyl pyridine, methylmethacrylate, hexylacrylate, 2-ethyl hexyl acrylate or mixtures thereof, and (c) at least one ethylenically unsaturated carboxylic acid monomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, fumaric acid, .beta.-carboxyethyl acrylate, itaconic acid or mixtures thereof. The process of the present invention is characterized by (1) polymerizing a first portion of non-carboxylic comonomer in the absence of any conjugated diene to a conversion of 60 to 90 percent to form a partially polymerized latex; (2) introducing to the partially polymerized latex the total amount of conjugated diene to be polymerized; (3) copolymerizing the conjugated diene with the unreacted non-carboxylic comonomer in the partially polymerized latex to a conversion of 75 to 90 percent of unreacted conjugated diene and noncarboxylic comonomer; (4) introducing the remaining portion of non-carboxylic comonomer to be polymerized to the latex having a conversion of 75 to 90 percent; and (5) copolymerizing the remaining portion of non-carboxylic comonomer in the latex with the unreacted conjugated diene latex to form a latex having a conversion of from 90 to 100 percent.

摘要翻译： 本发明涉及一种自由基乳液聚合方法。 通过聚合（a）至少一种共轭二烯，（b）至少一种选自苯乙烯，α-甲基苯乙烯，对甲基苯乙烯，乙烯基甲苯等的非羧酸乙烯基芳族或脂族共聚单体来制备胶乳， 丙烯腈，甲基丙烯腈，偏二氯乙烯，丙烯酸乙酯，丙烯酸丁酯，乙烯基吡啶，甲基丙烯酸甲酯，丙烯酸己酯，丙烯酸2-乙基己酯或其混合物，和（c）至少一种选自丙烯酸， 甲基丙烯酸，马来酸，富马酸，丙烯酸β-羧乙酯，衣康酸或其混合物。 本发明的方法的特征在于：（1）在不存在任何共轭二烯的情况下将第一部分非羧酸共聚单体聚合至60至90％的转化率以形成部分聚合的胶乳; （2）向部分聚合的胶乳中引入待聚合的共轭二烯的总量; （3）将共轭二烯与未反应的非羧酸共聚单体在部分聚合的胶乳中共聚合，转化率为75-90％的未反应共轭二烯和非羧酸共聚单体; （4）将待聚合的剩余部分非羧酸共聚单体引入转化率为75-90％的胶乳中; 和（5）将胶乳中的剩余部分的非羧酸共聚单体与未反应的共轭二烯胶乳共聚以形成转化率为90-100％的胶乳。