Oriented semicrystalline polymer films

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528128, 528170, 528172, 528173, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 528351, 528353, 4284735, 264165, 264216, 264237, 2642884, 2642893, 2642902, 264346, 264348, C08G 802, C08G 7310, B29C 7100

Patent

active

052645347

ABSTRACT:
Processes for producing oriented films of semicrystalline thermoplastic polymers, such as polyimides, and films produced thereby are disclosed. One process includes partial crystallization or imidization, orientation and further crystallization or imidization. Another process includes rendering a film of semicrystalline thermoplastic polymer amorphous, orienting the film and introducing crystallinity.

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