READILY BONDABLE POLYESTER FILM

• Main Authors: HIRATA JUN, KITAGAWA TAKEO, MIMURA TAKASHI
• Format: Patent
• Language: English
• Published: 20.09.1994
• 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; 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; 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; 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 subject product excellent in slippery property, water soluble property, blocking resistance, etc., and useful as a substrate film for magnetic recording materials, etc., by forming a coating film of a mixture of a water-soluble copolymer polyester and wax oxide on a polyester film. CONSTITUTION:This polyester film is obtained by forming a coating film consisting of a mixture of (A) a water soluble copolymer polyester and (B) wax oxide or wax oxide and rosin-modified wax, preferably in ratios of 85-99wt.% component A and 15-1wt.% component B on at least one side of a polyester film. Furthermore, preferably, the component A has the following constitutions: >=60% of a whole dicarboxylic acid component is an aromatic dicarboxylic acid such as terephthalic acid and 10-20mo1% thereof is an ester- forming sulfonic acid alkali metal salt compound such as 5-sulfoisophthalic acid sodium salt and >=60mol% of whole glycol component is aliphatic or alicyclic glycol such as ethylene glycol and 0-40mol% thereof is diethylene glycol.