COPOLYMER LATEX COMPOSITION FOR FOAM RUBBER, COPOLYMER LATEX COMPOSITION FOR VULCANIZABLE FOAM RUBBER, AND FOAM RUBBER

摘要

A copolymer latex composition for foam rubbers which is obtained by blending: a latex (A) of a copolymer (a) comprising 30-45 wt.% units (a1) of an ethylenic monomer containing a cyano group, 55-70 wt.% units (a2) of a conjugated diene monomer; and 0-15 wt.% units (a3) of an ethylenic monomer copolymerizable with the cyano-group-containing ethylenic monomer and conjugated diene monomer; with a latex (B) of a copolymer (b) comprising 45-65 wt.% units (b1) of an ethylenic monomer containing a cyano group, 35-55 wt.% units (b2) of a conjugated diene monomer, and 0-20 wt.% units (b3) of an ethylenic monomer copolymerizable with the cyano-group-containing ethylenic monomer and conjugated diene monomer (provided that the amount of the units (b1) of a cyano-group-containing ethylenic monomer is larger by at least 5 wt.% than the amount of the units (a1) of a cyano-group-containing ethylenic monomer), the weight proportion of the copolymer (a) to the copolymer (b) (copolymer (a)/copolymer (b)) being from 20/80 to 80/20.