1-Propene, 2-methyl-, polymer with 2-propenenitrile 2-Propenenitrile, polymer with 2-methyl-1-propene Acrylonitrile-isobutene copolymer Acrylonitrile-isobutene polymer Acrylonitrile-isobutylene copolymer Acrylonitrile-isobutylene polymer Acrylonitrile, polymer with 2-methylpropene Isobutylene-acrylonitrile copolymer Propene, 2-methyl-, polymer with acrylonitrile