Process for preparation of cellulose ester films

Details Process for preparation of cellulose ester films Process for preparation of cellulose ester films

1987-06-12

1989-03-14

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

106195, 264 21, 264207, B29C 4104

Patent

active

048122793

ABSTRACT:
Disclosed is a process for the preparation of cellulose ester films, which comprises dissolving a cellulose ester in an organic solvent, coating the solution on a substrate under rotation and peeling the film formed on the substrate from the substrate, wherein a second organic solvent having a compatibility with the organic solvent and being a poor solvent to the cellulose ester is added to the organic solvent solution of the cellulose ester to precipitate a cellulose ester having a high molecular weight in the cellulose ester, the cellulose ester having a high molecular weight is separated from the solution, and the remaining cellulose ester solution is formed into a cellulose ester film by the rotational film-forming method.
The cellulose ester film prepared according to this process is excellent in the thickness uniformity and free of color nonuniformity or streaks and has good optical properties.

REFERENCES:
patent: 3188224 (1965-06-01), Matalon
patent: 3928700 (1975-12-01), Lupica
patent: 4348238 (1982-09-01), Kroll
patent: 4536240 (1985-08-01), Winn

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