Objects from ethylene vinyl alcohol copolymers having a high strength and modulus as well as a process for the preparation thereof
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United States of America Patent
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Aug 6, 1991
Grant Date -
N/A
app pub date -
Nov 17, 1987
filing date -
Nov 17, 1986
priority date (Note) -
Expired
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Abstract
The invention relates to an object and a process for the preparation of an object from an ethylene-vinyl alcohol copolymer with high tensile strength and modulus, by converting: a) a solution of an ethylene-vinyl alcohol copolymer with a weight-average molecular weight above 6.times.10.sup.4 kg/Kmole into a shaped, solvent-containing object in a suitable solvent or mixture of solvents; b) converting this object into a gel object with a homogeneous gelstructure by rapid cooling to below the gelation temperature; c) removing the solvent present in this gel object for the most part d) Drawing the gel object during or after solvent removal at a temperature above the glass transition temperature but below the melting temperature of the copolymer.
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