Statistical copolymer latex and its application, and method for producing polymer latex

摘要

Problem to be solved: to provide a technique for improving the stability of dispersion of the antiaging agent in the chloroprene polymer latex and improving the heat resistance when the chloroprene polymer latex is dried.A statistical copolymer latex comprising a chloroprene monomer unit and an unsaturated nitrile monomer unit having an unsaturated nitrile monomer unit of from 5 to 20 mass%;The statistical copolymer latex was diluted with tetrahydrofuran solutionThe content of antiaging agents measured by gas chromatographyThe statistical copolymer latex is 1.0 to 6.0 mass% against 100 mass%The ratio of the concentration of antiaging agent (liquid sampling / bottom sampling liquid) in the liquid level sampling liquid and the bottom sampling liquid after centrifugation of the statistical copolymer latex by 14000 RPM / minute for 20 minutes is 0.6 toProvide a statistical copolymer latex.