Patent ID: 8329294
Filing Date: 2012-12-11
Classification: C08F,C08J,C08L,Y10T

Abstract:
1. A styrene-modified polypropylene-based resin particle comprising: a polypropylene-based resin having a melting point within a range from 140 to 145° C. and a polystyrene-based resin, wherein said polystyrene-based resin is included at 30 parts by weight or more but less than 600 parts by weight per 100 parts by weight of said polypropylene-based resin, polystyrene-based resin particles having a longitudinal particle diameter of 5 μm or less are dispersed within said polypropylene-based resin, so as to form an islands-in-sea structure, a quantity of said polypropylene-based resin increases near a surface of the styrene-modified polypropylene-based resin particle, and a quantity of said polystyrene-based resin increases with increasing proximity to a central portion of the styrene-modified polypropylene-based resin particle, such that the polystyrene-based resin particles are unhomogeneously dispersed in the polypropylene-based resin which forms a concentration gradient from the surface towards the central portion of the styrene-modified polypropylene-based resin particle.