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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 paper coating composition for gravure printing comprising a pigment and a copolymer latex as a binder, characterized in that said copolymer latex is a copolymer latex prepared by emulsion copolymerizing monomer mixture comprising 30 to 77.5% by weight of 1,3-butadiene, 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer, and 10 to 69.5% by weight of other monomer copolymerizable therewith in the presence of 0.1 to 30 wt. parts per 100 weight parts of the monomer mixture of a cyclic unsaturated hydrocarbon having one unsaturated bond in a ring selected from the group consisting of cyclopentene, cyclohexene and cycloheptene, said other monomer copolymerizable therewith comprising styrene, said styrene being present in an amount of at least 22% by weight of said monomer mixture.
A paper coating composition comprising a copolymer latex which is prepared by a process comprising emulsion polymerizing a monomer mixture comprising 10 to 70.5% by weight of 1,3-butadiene, 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer, and 10 to 89.5% by weight of other monomer copolymerizable therewith in the presence of 0.1 to 30 wt. parts per 100 wt. parts of the monomer mixture of a cyclic unsaturated hydrocarbon having one unsaturated bond in a ring selected from the group consisting of cyclopentene, cyclohexene and cycloheptene, said other monomer copolymerizable therewith comprising styrene, said styrene being present in an amount of at least 29% by weight of said monomer mixture.
A paper coating composition comprising a copolymer latex prepared by a process comprising emulsion polymerizing a monomer mixture comprising 10 to 70.5% by weight of 1,3-butadiene, 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer, and 10 to 89.5% by weight of other monomer copolymerizable therewith in the presence of 0.1 to 30 wt. parts per 100 wt. parts of the monomer mixture of a cyclic unsaturated hydrocarbon having one unsaturated bond in a ring selected from the group consisting of cyclopentene, cyclohexene and cycloheptene, characterized in that a part of a chain transfer agent is added after the completion of addition of the monomer mixture or by a process comprising emulsion polymerizing (a) 10 to 70.5% by weight of 1,3-butadiene, (b) 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer, and (c) 10 to 89.5% by weight of other monomer copolymerizable therewith in the presence of 0.1 to 30 wt. parts per 100 wt. parts of the monomer mixture of a cyclic unsaturated hydrocarbon having one unsaturated bond in a ring selected from the group consisting of cyclopentene, cyclohexene and cycloheptene, characterized in that, after the addition of a monomer mixture containing the monomer (a), a monomer mixture containing no monomer (a) is added;
Dependencies are inferred from the claim text.