Aqueous latex compositions for use as contact adhesives comprising a mixture of an amorphous copolymer A and an amorphous copolymer B and preferably a tackifying resin where A comprises units of vinylidene chloride, an internally plasticising comonomer like 2-ethylhexyl acrylate or n-butyl acrylate, and optionally a copolymerisable acid, and has Tg in the range -50 to <0°C, and B comprises units of vinylidene chloride, an alkyl acrylate and/or methacrylate or certain other comonomers, and optionally a copolymerisable acid, and has a Tg in the range 0 to 80°C, and wherein copolymer A has a modal molecular weight Mp within the range 100,000 to 700,000.
用作接触胶粘剂的
水性胶乳组合物,包括无定形共聚物 A 和无定形共聚物 B 的混合物,最好还包括增粘
树脂,其中 A 由偏二
氯乙烯、内部增塑共聚单体(如
丙烯酸 2-乙基己酯或
丙烯酸正丁酯)和可选择的可共聚的酸组成,Tg 在 -50 至 <0°C 之间,B 由偏二氯乙烯、丙烯酸烷基酯和/或
甲基丙烯酸酯或某些其他共聚单体和可选择的可共聚的酸组成,Tg 在 0 至 80°C 之间,共聚物 A 的模态分子量 Mp 在 100,000 至 700,000 之间。