PRODUCTION OF INSULATING VANISH, INSULATING VANISH OBTAINED THEREBY AND MULTILAYER PRINT CIRCUIT BOARD BY USING THE INSULATING VANISH

• Main Authors: MORITA TAKASHI, TAKAHASHI ATSUSHI, TANABE TAKAHIRO, KAMISHIRO YASUSHI, KOBAYASHI KAZUHITO, TAKANO MARE
• Format: Patent
• Language: English
• Published: 16.03.1999
• Edition: 6
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PRINTED CIRCUITS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

PROBLEM TO BE SOLVED: To obtain an insulating varnish excellent in dispersibility of at whisker; and appearance, and capable of manifesting high reliability, a low thermal expansion rate or the like by compounding a resin material with a solution comprising an electrically nonconductive whisker and a specific treating liquid. SOLUTION: (B) A resin material is compounded with a solution comprising (i) an electrically nonconductive whisker, preferably a ceramic whisker having 0.3-3.0 μm average diameter and 3-50 μm average length and (ii) a solvent treating liquid for treating the surface of the component (i) in the method for producing the objective insulating vanish. A solvent solution of a silane-based coupling agent, a solvent solution of a titanate-based coupling agent and a solution of a silicone oligomer having two or more siloxane repeating units and one or more functional groups reactive with hydroxy group on a substrate at the ends, or the like are preferably used as the component (ii). A resin used in a prepreg using a glass cloth as the substrate, a thermoset resin used in an adhesive film with a copper foil, or the like are preferably used as the component B.