Process for producing a sponge

Details Process for producing a sponge Process for producing a sponge

1997-06-16

1999-05-25

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

264233, 264234, 264344, 264 86, B29C 6720

Patent

active

059067802

ABSTRACT:
A sponge of decrystallized cellulose modified by an acetyl group content, where the average degree of substitution is 0.2 to 1.5. No organic or inorganic sulfur compounds are present in the sponge. The sponge is produced by treating pulp with sodium hydroxide solution, then treating it with acetylating substances, drying and dissolving in an organic solvent with the addition of a pore-forming salt, fibers and optionally pigment dyes, pressing the mixture into a perforated mold whose receiving volume corresponds to the dimensions of the sponge to be produced, then placing the mold with its contents in boiling water, and removing the sponge thus formed in the mold.

REFERENCES:
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patent: 3382303 (1968-05-01), Stieg
patent: 3412184 (1968-11-01), Sharples et al.
patent: 3432584 (1969-03-01), Cannon et al.
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patent: 3527853 (1970-09-01), Rowley et al.
patent: 3546209 (1970-12-01), Lipps, Jr.
patent: 3718722 (1973-02-01), Lee
patent: 4173613 (1979-11-01), Rodier
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patent: 4302252 (1981-11-01), Turbak et al.
patent: 4352770 (1982-10-01), Turbak et al.
patent: 4388256 (1983-06-01), Ishida et al.
Ullmann's Encyklopadie der Technischen Chemie, vol. 18, pp. 175-177, Oct. 1967.

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