Biaxially stretched polyester films

Details Biaxially stretched polyester films Biaxially stretched polyester films

1982-12-10

1984-06-12

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528274, 528279, 528283, 528285, 528286, 5283081, 5283082, C08G 6304, C08G 6330

Patent

active

044543123

ABSTRACT:
A biaxially stretched polyester film comprising a polyester and zirconium as an internal particle material, produced by polycondensation of terephthalic acid or its esterified derivative and alkylene glycol as the major essential monomeric components in the presence of a polycondensation catalyst, during which zirconium in the form of any compound thereof in an amount of 80 to 2500 ppm in terms of zirconium atom to the polyester as produced being introduced into the reaction system at a stage after the initiation of the reaction and before the intrinsic viscosity of the reaction mixture reaching 0.2, and subjecting the produced polyester to film forming.

REFERENCES:
patent: 3795639 (1974-03-01), Chimura et al.
patent: 3817931 (1974-06-01), Brooks et al.
patent: 4008207 (1977-02-01), Omoto et al.
patent: 4067855 (1978-01-01), Miwa et al.
patent: 4104263 (1978-08-01), Kenney

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