Patent ID: 8142698
Filing Date: 2012-03-27
Classification: C08G,C08K,C08L,Y10T

Abstract:
1. A method of reducing a surface glossiness of an organopolysiloxane-cured article comprising: preparing a liquid organopolysiloxane composition for matting comprising: (A) 100 parts by weight of a thermosetting liquid organopolysiloxane composition having a specific gravity of 0.85 to 1.2, and (B) 0.1 to 100 parts by weight of a hollow filler having a melting point of at least 150° C., a specific gravity of 0.01 to 0.8, and a particle size of up to 200 μm, said liquid organopolysiloxane composition has a viscosity at room temperature of 100 to 100,000 mPa·s; casting said liquid organopolysiloxane composition as a potting material; and curing said liquid organopolysiloxane composition at a temperature of 10 to 160° C. for 30 to 180 minutes, whereby the hollow filler incorporated as the component (B) having a lighter specific gravity than the organopolysiloxane composition floats to the surface of the organopolysiloxane composition and forms surface irregularities on the surface of the cured article in the course of the curing step to provide a surface glossiness of up to 40 in the cured article having a matted surface.