Processing cellulose acetate formed articles using supercritical

Details Processing cellulose acetate formed articles using supercritical Processing cellulose acetate formed articles using supercritical

1995-01-26

1996-04-30

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

With prevention of equipment fouling accumulations or deposits

264203, 264207, D01D 110, D01F 228, D01F 230

Patent

active

055122310

ABSTRACT:
A process for preparing cellulose acetate articles such as fibers. The process includes the following steps: Cellulose acetate is dissolved in a solvent to form a solution, the solvent made up of from 5% to 50% by weight of carbon dioxide and from 95% to 50% of a compatible solvent such as acetone. The solvent is above the supercritical conditions of CO.sub.2. The solution is filtrated of insoluble matter and extended to form a fiber or similar article.

REFERENCES:
patent: 4308200 (1981-12-01), Fremont
patent: 4493797 (1985-01-01), Avedesian
patent: 4675198 (1987-06-01), Sevenants
patent: 5009746 (1991-04-01), Hossain et al.
patent: 5328934 (1994-07-01), Schiraldi

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