MOLDABLE POLYPROPYLENE RESIN COMPOSITION

摘要

A moldable composition comprises by weight (1) 50 to 97% of a crystalline propylene-ethylene copolymer e.g. a block copolymer, (2) optionally 0 to 20% of a rubbery material, e.g. an ethylene-propylene or -butene rubber, and (3) 3 to 50% of mica having an average particle diameter determined by photo extinction and sedimentation of 0.5 to 4.5 mu (microns) and a particle size distribution by wt of:… 95% or more 10 mu or less… 60% or more 5 mu or less… 10 to 80% 1 mu or less. …The mica, preferably muscovite or phlogopite, is obtained by precise classification of natural mica, uncrushed or mechanically pulverized. …The components are mixed and kneaded and the composition is extruded or molded to make parts of machinery or appliances; the products have good rigidity and impact strength and thermal stability.