Method of producing flexible printed-circuit board covered with cover layer

• Main Authors: NAGAO, KOUICHI, SUZUKI, MASAKATSU, NOMURA, HIROSHI, IMAIZUMI, JUNICHI, OTI, TAKATO, SATOU, EIKICHI, KATOH, YASUSHI
• Format: Patent
• Language: English; French; German
• Published: 10.06.1992
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CABLES; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMISTRY; COMPOSITIONS BASED THEREON; CONDUCTORS; DYES; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; INSULATORS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; PRINTED CIRCUITS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING-UP

A flexible printed-circuit board covered with a cover layer is produced by bonding (a) a flexible printed-circuit board that comprises a flexible base having a surface bearing a circuit and (b) a polyimide film having a surface treated to increase adhering property and another surface not treated to increase adhering property, each of the surfaces being coated with an adhesive layer, with the adhesive layer on the surface treated to increase adhering property interposed between the polyimide film and the surface bearing the circuit, and then peeling off the adhesive layer coating the polyimide film on the surface not treated to increase adhering property.