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

1994-03-18

1995-12-26

Buttner, David

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264 134, 264 26, 524108, 528196, 528501, B29C 3938, B29D 1100

Patent

active

054785189

ABSTRACT:
The present invention is to provide a polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to a polycarbonate film having a specific retardation value, and a process for producing a 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), Peilstocker
patent: 3164651 (1965-01-01), Chu
patent: 4607070 (1986-08-01), Schreckenberg
Kambour "BPA Polycarbonate Immersed in Organic Media"; Macromolecules 7(2) pp. 248-253, Mar. 1974.

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