THERMALLY STABLE TRANSPARENT SILICONE RESIN COMPOSITIONS AND METHODS FOR THEIR PREPARATION AND USE

• Main Authors: BAHADUR, MANEESH, NORRIS, ANN, WALSTROM, ZARISFI, AFROOZ
• Format: Patent
• Language: English; French; German
• Published: 19.06.2013
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SEMICONDUCTOR DEVICES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

A curable silicone composition includes (A) a polydiorganosiloxane having an average, per molecule, of at least two aliphatically unsaturated organic groups and at least one aromatic group; (B) a branched polyorganosiloxane having an average, per molecule, of at least one aliphatically unsaturated organic group and at least one aromatic group; (C) a polyorganohydrogensiloxane having an average per molecule of at least two silicon-bonded hydrogen atoms and at least one aromatic group, (D) a hydrosilylation catalyst, and (E) a silylated acetylenic inhibitor. The curable silicone composition cures to form a cured silicone resin having a refractive index >1.40. The curable silicone composition cures by heating to form a cured silicone resin with an optical transparency >95% at a thickness of 2.0 mm or less at 400 nm wavelength after thermal aging by heating at 200° C. for 14 days.