| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a styrene-based resin that has excellent heat resistance, weather resistance, melt stability and recyclability. <P>SOLUTION: The heat-resistant styrene-based resin composition comprises (I) a styrene-based copolymer that is a copolymer composed of an isopropenyl aromatic unit represented by formula (1) (R<SP>1</SP>is a hydrogen or a hydrocarbon-based compound) and a vinylaromatic unit represented by formula (2) (R<SP>2</SP>is a hydrogen or a hydrocarbon-based compound; R<SP>3</SP>is hydrogen or a phenyl group) and has 5-70 (Mw) content (A) of the isopropenyl aromatic unit and the ratio (Mz/Mw) of Z-average molecular weight (Mz) to weight-average molecular weight (Mw) of 1.4-3.0 and (II) a styrene-based-diene-based block copolymer obtained by block copolymerization of a styrene-based monomer unit and a conjugated diene-based monomer unit and satisfies the weight ratio (I/II) of the component (I) to the component (II) of I/II=99/1-50/50. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
