Process for the preparation of biaxially oriented polyester film

Details Process for the preparation of biaxially oriented polyester film Process for the preparation of biaxially oriented polyester film

1995-10-04

1996-07-09

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

By a temperature change

26417717, 26417719, 2642107, 26421112, 2642358, 264342RE, 264346, B29C 7102

Patent

active

055342159

ABSTRACT:
A biaxially oriented polyester film with excellent levelling property is produced by the inventive process which comprises: (a) melt-extruding and extending biaxially a polyester resin to shape it into a film; (b) treating the film thermally under a condition that formulae (1), (2) and (3) are satisfied; and (c) relaxing the film at a temperature range of Tm-60.degree. C. to Tm-140.degree. C. during the step (b):

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