发明名称 |
Aqueous emulsion-type pressure sensitive adhesives |
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 A1) 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 A2) derived from the ethylenically unsaturated monomer.
|
申请公布号 |
US4939190(A) |
申请公布日期 |
1990.07.03 |
申请号 |
US19880197963 |
申请日期 |
1988.05.24 |
申请人 |
DAINIPPON INK AND CHEMICALS, INC. |
发明人 |
TOMIOKA, REIZABURO;SHIGEMATSU, YASUHIRO |
分类号 |
C08F285/00 |
主分类号 |
C08F285/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|