Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1982-02-26
1984-03-27
Lovering, Richard D.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
71 6411, 71DIG1, 252522A, 264 41, 264 43, 424 22, 424 33, 424 35, 426 96, 426103, 4272133, 42721331, 42721336, 4284022, 42840221, 42840222, B01J 1302, B32B 2312, B32B 2704
Patent
active
044394888
ABSTRACT:
Chemical biological agents to be encapsulated are dissolved or dispersed in an aqueous paste of a gel-forming polyhydroxy polymer. Subsequent addition of boric acid or a boric acid derivative at an alkaline pH converts the paste into a gel, thereby entrapping the agents in a protective matrix. Encapsulation of biologically active compositions provides a shield against hostile environments, improves safety in handling, and slows the release of such compounds to the surrounding medium. Highly volatile liquids are protected against losses by evaporation. Encapsulation also provides protection against decomposition from exposure to ultraviolet light.
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H. Deuel et al., Nature 161: 96-97, (1948), "Reaction of Boric Acid with Polysaccharides".
J. Hollo et al., Fette, Seifen, Anstrichmittel 59: 94-98, (1957), "Undersuchung der Jod-Reaktion von Starke".
R. F. Nickerson, J. Appl. Polym. Sci. 15: 111-116, (1971), "Thickening of Poly(Vinyl Alcohol) by Borate".
E. P. Czerwin, Chem. Abstr. 87: 25086s, (1977), "Poly(Vinyl Alcohol)-Starch Composition".
Shasha Baruch S.
Trimnell Donald
Lovering Richard D.
McConnell David G.
Ribando Curtis P.
Silverstein M. Howard
The United States of America as represented by the Secretary of
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