Process for obtaining films and blocks of cellulose acetate part

Details Process for obtaining films and blocks of cellulose acetate part Process for obtaining films and blocks of cellulose acetate part

1973-04-30

1979-06-19

Griffin, Ronald W.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

210500M, 264 49, 264216, 264217, B29d 702

Patent

active

041586832

ABSTRACT:
An improved process for preparing films and blocks consisting essentially of cellulose diacetate aqueous gel, which are suitable for electrophoresis purposes, which process comprises dissolving cellulose diacetate in a first mixture of a major proportion of a water-miscible solvent with a minor proportion of a water-miscible swelling agent; swelling the cellulose diacetate solution by adding a second mixture of a major proportion of the swelling agent with a minor porportion of the solvent; adding to the swollen mass an amount of from 3 to 10% by weight based on the swollen mass of formamide, as regulator of the water content of the aqueous gel, substituting in the swollen mass water for the solvent and the swelling agent and casting the aqueous gel thus obtained to form a film or block by means of conventional procedures; wherein each of the foregoing steps is carried out at room temperature.

REFERENCES:
patent: 2926104 (1960-02-01), Goetz
patent: 3344214 (1967-09-01), Manjikian et al.
patent: 3412184 (1968-11-01), Sharples et al.
patent: 3432584 (1969-03-01), Cannon et al.
patent: 3432585 (1969-03-01), Watson et al.
patent: 3497072 (1970-02-01), Cannon
patent: 3567809 (1971-03-01), Ueno et al.
patent: 3592672 (1971-07-01), Rowley et al.
Manjikian et al., "Improvement in Fabrication Techniques for Reverse Osmosis Desalination Membranes," First International Symposium on Water Desalination, Oct. 3-9, 1965, Washington, D.C., pp. 1-6 & 13.

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