申请人:Takashima Kiyokuni
公开号:US20060194912A1
公开(公告)日:2006-08-31
A process for producing an emulsion pressure-sensitive adhesive comprises (co)polymerizing a main monomer in the presence of a protective colloid, the protective colloid being an acrylic copolymer comprising (A-1) at least one hydrophilic monomer selected from the group consisting of acrylamide, methacrylamide, hydroxyethyl acrylate and hydroxyethyl methacrylate and (B-1) an alkyl (meth)acrylate that is copolymerizable with the hydrophilic monomer (A-1) and whose alkyl group has 4 to 18 carbon atoms, or (A-2) a hydrophilic monomer being acrylic acid and/or methacrylic acid and (B-2) an alkyl (meth)acrylate that is copolymerizable with the hydrophilic monomer (A-2) and whose alkyl group has 4 to 9 carbon atoms; the hydrophilic monomer and the alkyl (meth)acrylate being copolymerized in a weight ratio in the range of 40-70:60-30; the acrylic copolymer having a weight-average molecular weight in the range of 500 to 50000. The acrylic copolymer for forming the protective colloid may be copolymerized with a third monomer (C) being acrylonitrile and/or styrene according to need. An emulsion pressure-sensitive adhesive obtained as above exhibits particularly high adhesive property to wetting surfaces.
生产乳液压敏胶粘剂的工艺包括在保护胶体的存在下共聚合主要单体,所述保护胶体是丙烯酸共聚物,包括(A-1)至少一种亲水单体,所述亲水单体选自丙烯酰胺、甲基丙烯酰胺、羟乙基丙烯酸酯和羟乙基甲基丙烯酸酯,以及(B-1)一种与亲水单体(A-1)共聚合且其烷基含有4至18个碳原子的烷基(甲基)丙烯酸酯,或(A-2)一种亲水单体为丙烯酸和/或甲基丙烯酸,以及(B-2)一种与亲水单体(A-2)共聚合且其烷基含有4至9个碳原子的烷基(甲基)丙烯酸酯;亲水单体和烷基(甲基)丙烯酸酯的重量比在40-70:60-30的范围内共聚合;丙烯酸共聚物的重均分子量在500至50000的范围内。用于形成保护胶体的丙烯酸共聚物可以根据需要与丙烯腈和/或苯乙烯等第三单体(C)共聚合。上述方法获得的乳液压敏胶粘剂对潮湿表面具有特别高的粘附性能。