| abstract |
[PROBLEMS] To provide a method for producing a copolymer latex having a small particle size, which has sufficient adhesive strength as a binder in a composition containing a filler and has low viscosity and good handling properties, and a composition for paper coating. A production method and a coated paper production method are provided. (A) 20 to 80% by mass of a structural unit derived from an aliphatic conjugated diene monomer, (B) 4 to 15% by mass of a structural unit derived from an unsaturated carboxylic acid monomer, and (C) It contains a copolymer having 5 to 76% by mass of structural units derived from other copolymerizable monomers, and the copolymer is synthesized by a batch polymerization method in the presence of an emulsifier. The structural unit derived from dicarboxylic acids out of the structural unit 4-15% by mass derived from the acid monomer is 0-1% by mass, the number average particle size measured by a transmission electron microscope is 30-80 nm, and the solid content 48 The viscosity at 50% by mass is 50 to 400 mPa ยท s. [Selection figure] None |