Latex adhesives having a Tg of -60 to 0°C characterized by superior rheological properties, are prepared without the use of additional thickeners from a colloid stabilized latex comprising: 65-90% by weight of the latex polymer solids of an acrylate or methacrylate ester monomer polymerized in 10-35% by weight of the latex solids of a polymeric colloid, the polymeric colloid having a Tg of -40 to 0°C, a number average molecular weight of 2,000 to 10,000 and comprising
a) 50 to 85% by weight of a monomer of the formula:
where R' is hydrogen or methyl and R" is a C1-C12 straight or branched chain alkyl group;
b) 10 to 50% by weight of an ethylenically unsaturated mono-or dicarboxylic acid;
c) 5 to 30% by weight of an acrylic or methacrylic ester of a polyalkylene oxide, and
d) 0 to 30% by weight of another ethylenically unsaturated copolymerizable monomer.
胶乳粘合剂的 Tg 值为 -60 至 0°C,具有优异的流变性能,无需使用额外的
增稠剂,由胶体稳定胶乳制备而成:按重量计,65-90%的胶乳聚合物固体是
丙烯酸酯或
甲基丙烯酸酯单体与按重量计,10-35%的胶乳固体是聚合物胶体聚合而成,聚合物胶体的 Tg 为 -40 至 0°C,平均分子量为 2,000 至 10,000,并包括
a) 50-85%(重量)的式中单体:
其中 R' 为氢或甲基,R" 为 C1-C12 直链或支链烷基;
b) 10-50%(重量百分比)
乙烯基不饱和单
羧酸或二
羧酸;
c) 5%至 30%(按重量计)的聚环氧烷的
丙烯酸酯或
甲基丙烯酸酯,以及
d) 0-30% (重量百分比)的另一种
乙烯基不饱和可共聚单体。