COPOLYMER LATEX, COMPOSITION THAT CONTAINS THE LATEX, AND ARTICLES MADE USING SAME

摘要

Provided is a copolymer latex having a small particle diameter. When used as a binder in a filler-containing composition, the copolymer latex can attain sufficient bond strength. Further, the copolymer latex has a low viscosity and exhibits excellent handleability. Also provided are: a composition for paper coating, which is prepared using the copolymer latex; and a coated paper that has a coating layer formed from the composition. The copolymer latex is a latex which contains a copolymer that comprises 20 to 80% by mass of structural units (A) derived from an aliphatic conjugated diene monomer, 4 to 15% by mass of structural units (B) derived from an unsaturated carboxylic acid monomer, and 5 to 76% by mass of structural units (C) derived from one or more other copolymerizable monomers (with the proviso that the sum total of the components (A), (B) and (C) is 100% by mass) and which has a number-mean particle diameter of 30 to 80nm as determined with a transmission electron microscope and exhibits a viscosity of 50 to 400mPa·s at a solid content of 48% by mass.