Process for making oriented semicrystalline polyester films

Details Process for making oriented semicrystalline polyester films Process for making oriented semicrystalline polyester films

1992-10-26

1995-04-25

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

B29C 5514

Patent

active

054096570

ABSTRACT:
Disclosed are semicrystalline polyester oriented films having the properties of MD F5.gtoreq.18 daN/mm.sup.2, TD F5.gtoreq.10 daN/mm.sup.2, MDE.gtoreq.800 daN/mm.sup.2, TDE.gtoreq.400 daN/mm.sup.2, MDE+TDE.gtoreq.1200 daN/mm.sup.2, MDS 105.ltoreq.1.5%, MDS 150.ltoreq.5.2%, and TD St/TD F5.ltoreq.2.2. Also disclosed is a process for preparing semicrystalline polyester oriented films wherein an amorphous polyester film is successively subjected to a sequence of drawings comprising a lengthwise drawing in a single stage, a transverse drawing and a lengthwise drawing, wherein the first drawing mD is conducted at a temperature of between Tg +40.degree. C. and Tc -20.degree. C. and with a draw ratio .lambda.mD of between 1.2 and 3.

REFERENCES:
patent: 3177277 (1965-04-01), Adams et al.
patent: 4237088 (1980-12-01), Yoshimura et al.
patent: 4497865 (1985-02-01), Minami et al.
patent: 4798759 (1989-01-01), Dallman et al.
patent: 5139727 (1992-08-01), Utsumi et al.

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