| 摘要 |
<p>Disclosed is a graft copolymer (A + B) of a styrene-based monomer (A) and a terminal styrene derivative-modified olefin-based macromer (B) of formula (1), having a high degree of syndiotacticity for the stereospecificity of the chains derived from the styrene-based monomer: <CHEM> R is H or alkyl; X is H, halogen, or a substituent having one or more of C, Sn and Si; n is 1 to 4; m is 0 or a natural number; Z is a chain moiety derived from an olefin-based monomer. The copolymer is prepared by copolymerizing (A) and (B) in the presence of a catalyst comprising (a) a transition metal compound, (b) (i) a specific oxygen-containing compound and/or (ii) a compound capable of reacting with the compound (a) to form an ionic complex, and optionally (c) an alkylating agent. The graft copolymer (A + B) and a styrene-based resin composition comprising the graft copolymer (A + B) or comprising the macromer (B) have good heat resistance, good chemical resistance, high stiffness and good miscibility with various resins, and are useful as component parts for composite materials and also as heat-resistant elastomers.</p> |
