Film of a polyethylene-1,2-diphenoxy-ethane-4,4'-dicarboxylate copolymer

Abstract

Abstract Films from a polyethylene-1,2-diphenoxyethane-4,4''-dicarboxylate copolymer with a comonomer selected from the group consisting of glycols other than ethylene glycol and dicarboxylic acid other than 1,2-bis(P-carboxyphenoxy) ethane contained in a proportion from one to 10 mole percent which have outstanding unidirectional characteristics, said film having in the direction of extrusion a tensile breaking strength from 1,800 to 3,500 kg./cm.2, a tensile breaking elongation from 10 to 30 percent and a modulus of tensile elasticity from 57,000 to 100,000 kg./cm.2 and method for the preparation of the same which comprises stretching a substantially amorphous film from said copolymer at a temperature from 70* to 200*C. either simultaneously or successively in the direction of extrusion and in a direction rectangular thereto to a stretch ratio of from 3.0 to 5.0 in the former direction and a stretch ratio of from 1.5 to 3.0 in the latter direction and heat-setting the film thus stretched anisotropically along the two axes at a temperature from 150* to 220*C. are disclosed.

Inventors

• 👤 H Kobayashi
• 👤 K Sasaguri

Bibliographic Details