| 摘要 |
<p>2 to 30 parts by weight of a core/shell graft copolymer is compounded as an impact modifier with 98 to 70 parts by weight of a chlorinated vinyl chloride resin to give a chlorinated vinyl chloride resin composition having excellent impact resistance and more improved transparency. The core/shell graft copolymer is obtained by graft-polymerizing at least one monomer selected among alkyl methacrylates in which each alkyl has 1 to 4 carbon atoms, alkyl acrylates in which each alkyl has 1 to 8 carbon atoms, acrylonitrile, and styrene compounds in one or more steps onto cores made of a copolymer obtained from 30 to 80 wt.% of 1,3-butadiene and 70 to 20 wt.% of at least one vinyl monomer selected among styrene compounds and alkyl (meth)acrylates. The core/shell copolymer satisfies the following requirements (1) and (2): A-B ≥ -0.005; 1.542 ≤ B ≤ 1.565; wherein A is the refractive index of the cores and B is the refractive index of the core/shell graft copolymer.</p> |
