Process for producing biaxially oriented polyester film as a bas

Details Process for producing biaxially oriented polyester film as a bas Process for producing biaxially oriented polyester film as a bas

1996-09-06

1998-09-08

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

2642107, 264216, 2642358, 2642902, 264346, B29C 4788, B29D 701

Patent

active

058041192

ABSTRACT:
A process for producing a biaxially oriented polyester film including the steps of causing a molten aromatic polyester which contains naphthalene-2,6-dicarboxylatic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component to pass through a single-layer or multi-layer metal fiber nonwoven fabric, melt extruding the molten polymer into a form of a sheet, quenching and solidifying the sheet to produce an unoriented film, biaxially orienting the unoriented film, and thermally setting the biaxially oriented film to form a biaxially oriented polyester film, as a base film for a photographic film, which contains substantially no gel as large as 40 .mu.m or more.

REFERENCES:
patent: 4876137 (1989-10-01), Utsumi
patent: 5043197 (1991-08-01), Renalls
patent: 5294695 (1994-03-01), Lee et al.
patent: 5599658 (1997-02-01), Greener et al.

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