STRETCHED MOLDING MADE OPAQUE AND ITS MANUFACTURE

摘要

PURPOSE:To obtain a stretched molding which possesses excellent opaque feeling and is light in weight and high in a gas transmission factor, by a method wherein a composition obtained by compounding a specific quantity of specific cyclopentadiene petroleum resin with polypropylene is stretched under specific conditions. CONSTITUTION:3-40 pts.wt. cyclopentadiene petroleum resin or hydrogenated cyclopentadiene petroleum resin or their mixture is compounded on the basis of 100 pts.wt. polypropylene. When loadings of the petroleum resin is less than 3 pts.wt., opaqueness giving effect becomes insufficient and when the same exceeds 40 pts.wt., an extrusion irregularity or stretching break is apt to generate, productivity is deteriorated extremely and it is not preferable. With this construction, a stretched molding made opaque where its whole light transmission factor and density are not exceeding respectively 50% and 0.89 is obtained.