Process for preparation of cellulose nitrate films

Details Process for preparation of cellulose nitrate films Process for preparation of cellulose nitrate films

1988-09-21

1991-10-08

Nutter, Nathan M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

106195, 428213, 428215, C08B 502, C08L 118, C09J 400, B32B 702

Patent

active

050555685

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 menthod.
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: 4536240 (1985-08-01), Winn

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