Shaped articles from insoluble hydrogels and method of manufactu

Details Shaped articles from insoluble hydrogels and method of manufactu Shaped articles from insoluble hydrogels and method of manufactu

1978-05-30

1980-10-14

Lovering, Richard D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

252316, 260 296MM, 260 296TA, 264299, 526221, 526341, B29C 300, C08L 3504

Patent

active

042280567

ABSTRACT:
Substantially water-insoluble, water-swellable crosslinked hydrogels are prepared by polymerizing monomeric material consisting predominantly of acrylonitrile in aqueous salt solution containing zinc chloride as the main component, in absence of added crosslinking agents. The concentration of acrylonitrile is in the range of about 20 to about 40% by weight, related to the weight of the polymerization batch as a whole 100%. The process is carried out by partially hydrolyzing the primary gel thus obtained which consists of polyacrylonitrile plasticized with the aqueous salt solution, whereafter the zinc ions are removed from the gel by treating it with a dilute aqueous solution of at least one electrolyte forming an insoluble precipitate therewith. The partial hydrolysis may be carried out either by increasing the acidity of the solution or temperature or both.
Insoluble crosslinked hydrogels are prepared in the form of shaped articles, preferably in either closed or open molds, or in raw castings such as sheets or plates from which the final shaped articles can be manufactured by mechanical processes such as by cutting.

REFERENCES:
patent: 2648593 (1953-08-01), Stanton et al.
patent: 2763636 (1956-09-01), Davis
patent: 2968558 (1961-01-01), Clavier et al.
patent: 3242120 (1966-03-01), Steuber
patent: 3345350 (1967-10-01), Shavit et al.
G. S. Newth: "Manual of Chemical Analysis-Qualitative and Quantitative", Tenth Impression, Longmans, Green and Co., 1914, p. 55.

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