Potting material or coating material consisting of matte for liquid organopolysiloxane composition and matte cured product, as well as surface gloss reduction method

摘要

A liquid organopolysiloxane composition is provided. This composition can readily form a cured article having a matted surface without requiring separate step such as mechanical surface roughening, and this composition is well adapted for use as a potting material or a coating material in electric and electronic components such as LED. An article having a matted surface produced by curing such composition is also provided. The liquid organopolysiloxane composition for matting comprises (A) 100 parts by weight of a thermosetting liquid organopolysiloxane composition, and (B) 0.1 to 100 parts by weight of a hollow filler having a melting point of at least 150° C., a specific weight of 0.01 to 0.8, and a particle size of up to 200 mum. The composition has a viscosity at room temperature of 100 to 100,000 mPa.s. The resulting cured article has a surface glossiness of up to 40.