| 摘要 |
PURPOSE:To obtain a modified polypropylene freed from foaming during molding and having good adhesion to polar substances, by heat-treating a specified modified polypropylene and blending the heat-treated polypropylene with an atactic propylene/ethylene block copolymer. CONSTITUTION:A mixture consisting of polypropylene, an unsaturated carboxylic acid or its derivative and an organic peroxide is melt-blended. The resulting modified polypropylene is heat-treated at a temperature>=60 deg.C, pref., >=100 deg.C and 90-50pts.wt. this modified polypropylene is blended with 10-50pts.wt. atactic propylene/ethylene block copolymer. As the unsaturated carboxylic acid which can be used, maleic anhydride is most suitable. The heating time for heat- treatment is generally about 10min-10hr, and preferably this heat-treatment is carried out so that the modified polypropylene is devolatilized by heating to an unreacted monomer content <=0.05mol%. |
