| 摘要 |
PURPOSE:Polypropylene based resin particles, consisting of a propylene-alpha-olefin random copolymer and specific ethylenic copolymer, having improved foaming property, moldability and containing expanded particles having uniform and coarse cells. CONSTITUTION:Expanded polypropylene based resin particles obtained by blending (A) 80-99pts.wt. propylene-alpha-olefin random copolymer with 0.5-30wt%, preferably 1-20wt% content of an alpha-olefin, e.g. ethylene or butene-1, etc., and 0.1-50g/10min melt index with (B) 0.1-20pts.wt., preferably 0.5-10pts.wt. ethylenic copolymer having (B1) 65-98.5% ethylene constituent units, (B2) 1-30wt% ester constituent units selected from alkyl (meth)acrylates having 1-8C alkyl group and (B3) 0.5-10wt% unsaturated dicarboxylic acid anhydride constituent units and further blending the resultant polypropylene based resin particles with an evaporation type foaming agent, e.g. propane, etc.
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