JPH05310977

• Main Authors: HIRATA JUN, KITAGAWA TAKEO, MIMURA TAKASHI
• Format: Patent
• Language: English
• Published: 22.11.1993
• Edition: 5
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PURPOSE:To obtain the polyester film, excellent in adhesion, blocking resistance and electrification characteristics and suitable as a substrate film, etc., for magnetic recording materials by laminating a specific readily bondable layer to a polyester film. CONSTITUTION:The objective product is obtained by laminating a layer composed of (A) a water-soluble copolyester composed of an acid component containing g >=50mol% aromatic dicarboxylic acid component (preferably terephthalic acid, etc.) and 5-50mol% ester-forming alkali metal sulfonate compound (preferably sodium 5-sulfoisophthalic acid, etc.) and a glycol component (preferably ethylene glycol, etc.) and (B) a silane coupling agent (preferably gamma-glycidoxypropyltrimethoxysilane) to at least one surface of a polyester film. Polyethylene terephthalate is preferred as the polyester forming the film.