Easily tearable biaxially oriented polyester film

Details Easily tearable biaxially oriented polyester film Easily tearable biaxially oriented polyester film

1997-10-08

2000-12-05

Dye, Rena L.

Stock material or miscellaneous articles

Composite

Of polyester

428 352, 428 357, 428 3692, 428910, 525444, 2065241, 383201, B65D 3002, B65D 3300, C08F 2010

Patent

active

061564419

ABSTRACT:
The present invention provides a biaxially oriented polyester film having a linearly tearable property at least in a longitudinal direction, and excellent in the producability at mass production scale, which can be produced from the mixture of polybutylene terephthalate containing 5 to 20% by weight of a polytetramethylene glycol (PTMG) unit having a molecular weight of 600 to 4,000 (modified PBT) and polyethylene terephthalate (PET) in a weight ratio (PET/modified PBT) of 70/30 to 95/5.

REFERENCES:
patent: 3013914 (1961-12-01), Willard
patent: 4070417 (1978-01-01), Isaka et al.
patent: 4228218 (1980-10-01), Takayanagi et al.
patent: 4286011 (1981-08-01), Wong
patent: 5284699 (1994-02-01), Nishino et al.
patent: 5613779 (1997-03-01), Niwa
patent: 5912060 (1999-06-01), Kishida et al.
Derwent Abstract of JP 8-169962A; Biaxially Stretched Polyester Film For Packing Material; Unitika, Jul. 1996.
West-JPO Abstract of JP 408169962A; Biaxially Oriented Polyester Film; Kishida, Hioki and Ishikawa, Jul. 1996.

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