Aqueous emulsion-type pressure sensitive adhesives
    1.
    发明授权
    Aqueous emulsion-type pressure sensitive adhesives 失效
    水乳液型压敏粘合剂

    公开(公告)号:US4939190A

    公开(公告)日:1990-07-03

    申请号:US197963

    申请日:1988-05-24

    IPC分类号: C08F285/00

    摘要: An aqueous emulsion-type pressure sensitive adhesive characterized in that the aqueous emulsion is prepared by(i) a first step of emulsion polymerizing an ethylenically unsaturated monomer composed essentially of at least one type of styrene, alpha-methylstyrene, acrylonitrile, methyl methacrylate and vinyltoluene in the presence of an emulsion composed of at least one tackifier resin selected from a rosin ester, a petroleum resin and a terpene resin to form an aqueous emulsion containing particles of a two-layered structure having a core layer of the tackifier resin and a layer of a polymer (polymer A.sub.1) derived from the ethylenically unsaturated monomer, and(ii) a second step of using the aqueous emulsion containing the particles of the two-layered structure as a seed and emulsion polymerizing an ethylenically unsaturated monomer composed essentially of at least one alkyl (meth)acrylate (an alkyl group has 4 or more carbon atoms) to form an aqueous emulsion containing particles of a multilayered structure having also a layer of a polymer (polymer A.sub.2) derived from the ethylenically unsaturated monomer.

    摘要翻译: 一种水性乳液型压敏粘合剂,其特征在于所述水性乳液通过以下步骤制备:(i)第一步骤,使基本上由至少一种苯乙烯,α-甲基苯乙烯,丙烯腈,甲基丙烯酸甲酯和乙烯基甲苯组成的烯属不饱和单体乳液聚合 在由至少一种选自松香酯,石油树脂和萜烯树脂的增粘剂树脂组成的乳液的存在下,形成含有具有增粘树脂核心层的二层结构颗粒的水性乳液和层 的衍生自烯键式不饱和单体的聚合物(聚合物A1),和(ii)使用含有两层结构的颗粒的水性乳液作为种子的第二步骤,并将基本上至少组成的烯属不饱和单体进行乳液聚合 一种(甲基)丙烯酸烷基酯(烷基具有4个或更多个碳原子)以形成含有a的颗粒的水性乳液 多层结构还具有源自烯属不饱和单体的聚合物层(聚合物A2)。