Polycarbonate film for optical purposes and a production process

Details Polycarbonate film for optical purposes and a production process Polycarbonate film for optical purposes and a production process

1995-05-16

1996-10-01

Buttner, David

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

Synthetic resins

Processes of preparing a desired or intentional composition...

428220, B29D 1100

Patent

active

055611800

ABSTRACT:
The present invention is to provide polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to polycarbonate film having a specific retardation values, and a process for producing polycarbonate film by casting a dope onto a support and evaporating the solvent with heat wherein the dope is prepared by dissolving 10 parts by weight of polycarbonate resin in 30 to 150 parts by weight of the solvent mixture which contains more than 60% by weight of dioxolane.

REFERENCES:
patent: 2964797 (1960-12-01), Pielstocker
patent: 3164651 (1965-01-01), Chu
patent: 4607070 (1986-08-01), Schreckenberg

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