Biaxially oriented polyester film

Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified

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428480, 428910, 528302, 528305, 528308, 174110SR, 174137R, B32B 2700, B32B 2706, B32B 2736, C08G 63189

Patent

active

057310718

ABSTRACT:
A biaxially oriented polyester film which has excellent resistances to dry heat deterioration and wet heat deterioration, which can withstand the use in an atmosphere of relatively high moisture content, and which is useful, for example, as an electrical insulating film, a film for transparent electrode, a film for absorption of electromagnetic wave (e.g. a film used as an inspection window of microwave oven) and a reflection film. This recurring unit.! 99.5 to 95 mole % of ethylene-2,6-naphthalenedicarboxylate and 0.5 to 5 mole % of ethylene-2,7-naphthalenedicarboxylate and has a density of 1.355 to 1.370 g/cm.sup.3 and an intrinsic viscosity of 0.62 to 0.90. The polyester film has an amount of terminal carboxyl in the polyester of 40 eg/10.sup.6 g or less and an amount of oligomers of 2.0 mg/m.sup.2 film or less.

REFERENCES:
patent: 3937754 (1976-02-01), Shimotsuma et al.
patent: 3984379 (1976-10-01), Oka et al.
patent: 4729915 (1988-03-01), Sakamoto et al.
patent: 4814221 (1989-03-01), Utsumi
Database WPI Week 8847, Derwent Publications Ltd., London, GB; AN 88-336072 Anonymous & Research Disclosure vol. 294, No. 028, 10 Oct. 1988.
Database WPI Week 7541, Derwent Publications Ltd., London, GB; AN 75-67874W & JP-A-50 024 336 (Teijin) 15 Mar. 1975.

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