VARNISH COMPOSITION, AND PREPREG AND METAL FOIL-CLAD LAMINATE USING THE SAME

• Main Authors: SHIMAOKA SHINJI, KATO AKIRA, OSE MASAHISA, AITSU SHUJI
• Format: Patent
• Language: English
• Published: 24.11.2011
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS AS ADHESIVES; WORKING-UP

PROBLEM TO BE SOLVED: To provide a metal foil-clad laminate exhibiting good drill workability; and to provide a prepreg using the same.SOLUTION: In the prepreg prepared by impregnating a glass woven fabric or a glass nonwoven fabric with a vanish containing a thermosetting resin and an inorganic filler, and drying to make a semicured state, the filling rate of the inorganic filler is 40 to 70 wt.% of the total resin component of the vanish, and ≥50 wt.% of the inorganic filler is a synthetic spherical silica having an average particle diameter of 0.4 to 0.7 μm. There is also provided the metal foil-clad laminate.