Freeze-stabilized silica sol and its use as liquid for phosphate

Details Freeze-stabilized silica sol and its use as liquid for phosphate Freeze-stabilized silica sol and its use as liquid for phosphate

1989-03-23

1991-07-02

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

100 3835, 2523132, C04B 1204

Patent

active

050282700

ABSTRACT:
An aqueous silicic acid sol which is freeze-stabilized and which is useful for the production of phosphate-based embedding compositions used in dental technology, the aqueous silicic acid sol including from 25 to 50 weight percent of silicon dioxide; and from 2 to 10 weight % of a compound which is one of urea or a urea derivative and which has the general formula: ##STR1## wherein X and Y are groups selected from the group consisting of an --NH.sub.2 group and an --NHR group, in which R is an alkyl radical having from 1 to 4 carbon atoms.

REFERENCES:
patent: 2601291 (1952-06-01), Horning et al.
patent: 2788285 (1957-04-01), Lander
patent: 4057525 (1977-11-01), Kikuchi et al.
Hawley, The Condensed Chemical Dictionary, p. 773-774, 800, 803 & 924, 1977.
Bayer-Kieselso, product brochure.

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