HOCHGLAENZENDE, KAUTSCHUKVERSTAERKTE POLYSTYROLZUSAMMENSETZUNG UND VERFAHREN ZU IHRER KONTINUIERLICHEN HERSTELLUNG

摘要

This invention relates to a rubber-reinforced polystyrene composition having a rubbery polymer dispersed in the form of particles therein, characterized in that: (A) the particles have an area-averaged particle diameter in the range of 0.20 to 1.00 micron, (B) the dispersed particles of rubbery substance have polystyrene included in the form of minute particles therein and not less than 80% of the total number of the polystyrene particles have diameters of not more than 0.3 micron, and (C) the composition contains polydimethyl siloxane in an amount falling in the range of 0.005 to 0.8% by weight. The resin composition of this invention is superior in appearance such as coloring and gloss and has balanced properties of impact resistance and rigidity. Excellent coloring represents a profound commercial significance in that the cost of dye and pigment to be used for the coloring can be appreciably saved.