Chloroprene rubber composition and chloroprene rubber composition for vibration damping material

摘要

A chloroprene rubber composition comprising the following polymers A and B in such a proportion that A is from 20 to 70 wt% and B is from 30 to 80 wt%: A: a chloroprene polymer obtained by polymerization of chloroprene containing from 0 to 50 wt% of a comonomer copolymerizable with chloroprene, said polymer having a number average molecular weight of from 500 to 20,000; and B: a chloroprene polymer obtained by polymerization of chloroprene containing from 0 to 50 wt% of a comonomer copolymerizable with chloroprene, whereby with a 0.1 wt% tetrahydrofuran solution of said polymer, the weight of the polymer permeated through a filter having a pore diameter of 0.50 mu m is less than 0.90 time of the weight of the polymer permeated through a filter having a pore diameter of 1.0 mu m.