TRANSPARENTIZATION AGENT COMPOSITION CONTAINING SORBITOL COMPOUND AND METHOD FOR PRODUCING POLYPROPYLENE RESIN COMPOSITION USING THIS SORBITOL COMPOUND

摘要

The present invention relates to a transparentization agent composition, which is a mixture containing 100 parts by mass of a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 µm to 200 µm and 5 to 200 parts by mass of tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl)methane, wherein the total for the two components is 50% by mass or more of the mixture. Furthermore, the present invention relates to a method for producing a polypropylene resin composition, including obtaining a polypropylene resin composition in which a dibenzylidene sorbitol compound represented by the following general formula (I) having a particle diameter such that d 97 is from 30 µm to 200 µm is incorporated in a polypropylene resin, by kneading a mixture containing 100 parts by mass of the polypropylene resin and 0.05 to 2 parts by mass of the dibenzylidene sorbitol compound by using a biaxial extruder at an extrusion temperature of from 220 to 250°C.