Polysaccharide ester membrane clearing process

Details Polysaccharide ester membrane clearing process Polysaccharide ester membrane clearing process

1979-07-09

1980-12-30

Taylor, Hosea E.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Washing of article

264341, 264343, B29B 1122

Patent

active

042422981

ABSTRACT:
A method of clearing a polysaccharide ester membrane employing a clearing solvent comprising a first moiety selected from a group consisting of alcohols, ketones, ethers, esters, and mixtures thereof and a second moiety comprising a solvent selected from a group consisting of 2-ethoxyethanol, 2-ethoxyethyl acetate, methyl acetoacetate, ethyl acetoacetate, acetol, and mixtures thereof, the first moiety having a boiling point lower than the second moiety.
The solvents employed as the second moiety of the instant invention's clearing solvent are much less toxic than solvents employed as the second moiety of prior art clearing solvents.

REFERENCES:
patent: 2459927 (1949-01-01), Dreyfus et al.
patent: 3424640 (1969-01-01), Hines et al.
patent: 3592672 (1971-07-01), Rowley et al.
patent: 3637513 (1972-01-01), Schneider
patent: 3728269 (1973-04-01), Stephenson et al.

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