Process for the preparation of heat resistant polyester film

Details Process for the preparation of heat resistant polyester film Process for the preparation of heat resistant polyester film

1995-10-04

1996-08-13

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

528272, 528302, 528308, 5283086, 528481, 528502C, 528503, 2641761, 26417717, 26417719, 26421111, D01D 512

Patent

active

055453643

ABSTRACT:
A polyester film having excellent heat resistance and insulation property is produced by the inventive process which comprises: melt-extruding a polyester resin into a sheet, extending the sheet to shape it into a film and treating the film thermally to heat-set, wherein the polyester resin has an intrinsic viscosity of 0.7 to 0.75 dl/g and other portions which satisfy formula (1) and the thermal treatment is carried out so that formula (2) is satisfied:

REFERENCES:
patent: 3627579 (1971-12-01), Heffelfinger
patent: 4390683 (1983-06-01), Yatsu et al.
patent: 4677188 (1987-06-01), Utsumi et al.
patent: 4720412 (1988-01-01), Katoh et al.
patent: 4963418 (1990-10-01), Isaka et al.
patent: 4985538 (1991-01-01), Fukuda et al.
patent: 5153302 (1992-10-01), Masuda et al.
patent: 5439961 (1995-08-01), Itol et al.

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