Birefringent transparent film and process for producing the same

Details Birefringent transparent film and process for producing the same Birefringent transparent film and process for producing the same

1989-04-20

1991-01-15

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, C08G 802, C08B 7500

Patent

active

049855310

ABSTRACT:
A transparent film having birefringence comprising an amorphous aromatic polymer as a main component is disclosed. The film is produced by uniaxially stretching a film of an amorphous aromatic polymer. The film exhibits high transparency, high heat resistance, and heat distortion resistance, and its birefringence does not undergo changes with time.

REFERENCES:
patent: 2928295 (1975-12-01), Rose
patent: 4008203 (1977-02-01), Jones

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