PREPARATION OF FLAME-RETARDANT SILICONE MODIFIED EPOXY RESIN

• Main Authors: YUSA MASAMI, YOSHIMURA YUKIO, YASUZAWA KOUHEI, SHIBATA KATSUJI
• Format: Patent
• Language: English
• Published: 15.05.1985
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To obtain the titled resin useful as wiring plate, producing a small amount of smear during drill processing, by blending a specific epoxy resin, with tetrabromobisphenol A, a specified silicone intermediate, and a catalyst in a specific ratio, heating the blend at a specified temperature. CONSTITUTION:100pts.wt. epoxy resin (e.g., bisphenol A type epoxy resin, etc.) having 0-0.08 hydroxyl number is blended with 40-80pts.wt. tetrabromobisphenol A, 0.1-20pts.wt. silicone intermediate having 150-300 alkoxy group equivalent and 0.001-0.05pts.wt. catalyst (preferably quaternary ammonium salt), and heated at 120-200 deg.C, preferably at 150-170 deg.C (preferably 2-5hr) to give the desired resin. EFFECT:Since the reaction is carried out in one stage, shortening of process and uniformity of quality can be carried out.