FILE FORMED FROM POLYESTER HAVING URETHANE LINKAGE

• Main Authors: FUJIMAKI TAKASHI, NIIKURA ISAMU, HARIGAI NORITAMA, TAKIYAMA EIICHIRO
• Format: Patent
• Language: English
• Published: 08.06.1993
• 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; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; 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 provide a film having a mol.wt. high enough for practical use and excellent in tensile strength and thermal stability. CONSTITUTION:100 pts.wt. molten crystalline polyester having a number-average mol.wt. of 5,000 or higher and prepd. by reacting ethylene glycol with succinic acid is reacted with 0.1-5 pts.wt. diisocyanate above the m.p. of the polyester to give a polyester having a number-average mol.wt. of 10,000 or higher and at least two urethane linkages in the molecule, which is formed into a film.