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AssigneeSumitomo Dow Limited
InventorsWataru Fujiwara, Junkoh Hyoda, Kenichi Yamazaki, Noriko Kitamura
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A process for preparing a copolymer latex comprising emulsion polymerizing an aliphatic conjugated diene monomer and other monomer copolymerizable therewith in the presence of a cyclic unsaturated hydrocarbon having one unsaturated bond in a ring, in which, preferably a monomer mixture which does not contain the aliphatic conjugated diene monomer is added after the addition of a monomer mixture containing the aliphatic conjugated diene monomer, or a part of a chain transfer agent is added after the addition of the monomers. This copolymer latex is useful as an adhesive composition, a paper coating composition, an adhesive composition for back-sizing carpets, an adhesive composition for rock fiber materials, a paper coating composition for gravure printing, and a color developing composition for a pressure sensitive copying paper.
A color developing composition for a pressure sensitive copying paper comprising a pigment, a color developer and a copolymer latex as a binder, characterized in that said copolymer latex is a copolymer latex prepared by emulsion copolymerizing a monomer mixture comprising 20 to 60% by weight of 1,3-butadiene, 0 to 20% by weight of acrylonitrile, 1 to 20% by weight of an ethylenically unsaturated carboxylic acid monomer, and 34 to 79% by weight of at least one monomer selected from the group consisting of styrene, methyl methacrylate, .beta.-hydroxyethyl acrylate and acrylamide in the presence of 0.1 to 30 parts by weight per 100 parts by weight of the monomer mixture of cyclohexene.
Dependencies are inferred from the claim text.