BASE OF GOOD DIMENSION STABILITY FOR LAMINATE AND LAMINATE USING IT

• Main Authors: YAMASHINA NAOTOSHI, SENGEN MASATO, MURAMOTO MITSUHIRO
• Format: Patent
• Language: English
• Published: 17.10.1989
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; 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; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PRINTED CIRCUITS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PURPOSE:To enhance punching properties, heat resistance and dimension stability by impregnation a base for laminating using linters of specific flex degree of sulfate pulp, or else sulfite pulp with resin for laminating, and heat- laminating. CONSTITUTION:A base for laminating with its fiber flex degree reduced down to 50 or less is prepared by correcting the fiber shape by means of heating treatment for high fiber flex degree of linters, unbeaten sulfate pulp, or else unbeaten sulfite pulp. Thermoplastic resin such as phenol resin, melamine resin or the like is used for the resin for laminating, and prepregs are prepared by impregnating the base for laminating with said resin, and then the same are laminate molded under heat to manufacture a laminate. The range of 40-65wt.% of the volume of impregnated resin to the base is suitable. Thus, the dimension stability can be enhanced by said constitution without lowering purchasing properties and heat resistance of the laminate.