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US 4,061,613 AGranted
Semisolid polymerizable compositions, method of preparing the same and thermoset products thereof
AssigneeH. H. Robertson Company
InventorJames M. Self
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AssigneeH. H. Robertson Company
InventorJames M. Self
Estimating the term…
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.
A semisolid polymerizable composition comprisng the unpolymerized reaction product of:
The method of making a semisolid polymerizable composition which comprises mixing:
A homogeneous article comprised of
A two stage method for preparing a homogeneous article comprising:
Dependencies are inferred from the claim text.