| abstract |
(57) [Problem] To provide a copolymer latex and a paper coating composition which are excellent in physical properties of coated paper such as pick strength and the like, and which are excellent in operability in a process of producing coated paper. SOLUTION: A monomer comprising a specific amount of a conjugated diene, an ethylene carboxylic acid, vinyl cyanide and another copolymerizable monomer is converted into a conjugated diene, vinyl cyanide and another copolymerizable single monomer. A copolymer latex obtained by dividing the emulsion into at least two or more stages of a first step (A) of polymerizing a monomer composed of a body and a step (B) of polymerizing the remaining monomers, and performing emulsion polymerization. A copolymer latex having at least two or more glass transition temperatures, wherein the polymer obtained from the monomer composition of step (B) has a glass transition of 50 to 70 ° C., and paper containing the copolymer latex Composition for coating. |