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Patent Pending When two or more different monomers unite together to polymerize, their result is called a copolymer and its process is called copolymerization. Commercially relevant copolymers include acrylonitrile butadiene styrene (ABS), styrene/butadiene co-polymer (SBR), nitrile rubber, styrene-acrylonitrile, styrene-isoprene-styrene (SIS) and ethylene-vinyl acetate.