Semisolid polymerizable compositions, method of preparing the sa

Details Semisolid polymerizable compositions, method of preparing the sa Semisolid polymerizable compositions, method of preparing the sa

1976-02-04

1977-12-06

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 292UA, C08K 334

Patent

active

040616134

ABSTRACT:
Semisolid polymerizable compositions are obtained by combining unsaturated polyester resin syrup, aqueous sodium silicate and finely divided particulate calcium sulfate hemihydrate. The composition rapidly thickens to a semisolid state when the ingredients are mixed and retains its semisolid condition for extended periods of time. The unsaturated polyester resin syrup component of the mixture remains polymerizable until its polymerization is initiated, normally by means of heating in the presence of a high temperature polymerization initiator. Sufficient calcium sulfate hemihydrate is included to react with substantially all of the uncombined water in the other ingredients so that the resulting polymerizable composition is substantially free of uncombined water. The compositions may also contain inert fillers and/or reinforcing fibers. The compositions can be employed to produce coatings, laminates, cast articles, molded articles and other shaped articles.
The compositions may be employed in either of two alternative procedures. In the direct processing of the compositions, they are mixed, immediately formed and immediately polymerized to produce useful products. In the two stage processing of the compositions, they are mixed, allowed to thicken without polymerization and are retained as a semisolid polymerizable composition which is useful as a molding compound in the form of dough molding compounds, sheet molding compounds or molding powders. In all of these procedures, the preferred compositions include reinforcing glass fibers as an essential ingredient.

REFERENCES:
patent: 3240736 (1966-03-01), Beckwirth
patent: 3392127 (1968-07-01), DU Tertre
patent: 3437619 (1969-04-01), Nutt
patent: 3733285 (1973-05-01), Steffy
patent: 3798174 (1974-03-01), Acker et al.

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