IMPACT-RESISTANT GRAFT COPOLYMER AND THERMOPLASTIC RESIN COMPOSITION CONTAINING SAME

摘要

A graft copolymer is formed by graftpolymerizing 10 - 95 wt. parts of a vinyl monomer onto 5 - 90 wt. parts of the rubber polymer which comprises 40 - 99 wt. % of butadiene and 1 - 60 wt. % of an aromatic polycyclic vinyl monomer represented by the following formula (I) or (II): Formula (I) Formula (II) , or wherein R denotes a hydrogen atom or a methyl group. The graft copolymer is characterized by the rubber polymer having a high refractive index as well as a low glass transition temperature due to the use of the aromatic polycyclic vinyl monomer. Accordingly, the graft copolymer per se may be used as a thermoplastic resin having good transparency and impact resistance at a low rubber polymer content and may also be added to a transparent thermoplastic resin inclusive of a vinyl chloride resin and a styrene-acrylonitrile copolymer resin to provide the thermoplastic resin with an improved impact resistance while retaining a good transparency.