NITRILE GROUP-CONTAINING COPOLYMER RUBBER, CROSS-LINKABLE RUBBER COMPOSITION, AND CROSS-LINKED RUBBER

摘要

Provided is a nitrile-group-containing copolymer rubber that contains a,ß-ethylenic unsaturated nitrile monomer units in a proportion of 10-60 wt% and has a Z-average radius of gyration of 100 nm or more. The iodine value of the nitrile-group-containing copolymer rubber of the present invention is preferably 120 or lower. Additionally, the degree of plasticity of the nitrile-group-containing copolymer rubber of the present invention is preferably 14-90. The present invention makes it possible to provide a nitrile-group-containing copolymer rubber capable of yielding crosslinked rubber having exceptional tensile stress, compression set resistance, and low heat build-up.