Patent ID: 7279504
Filing Date: 2007-10-09
Classification: C08J

Abstract:
1. A method of using an inorganic filler having a substantially spherical granulometry, an average diameter of from 0.01 to 100 μ, a refraction index higher than 1.6 and a white index of 22 or less as defined in “Colour Index”, third edition published by The Society of Dyers and Colourists, 1982, said method comprising: polymerizing one or more vinylaromatic monomers in an aqueous suspension polymerization in the presence of the inorganic filler; forming substantially spherical beads of a polymer which comprise the inorganic filler homogeneously dispersed in the entire bead, and adding an expanding agent to the aqueous suspension polymerization before, during or after the polymerizing.