Polymer Compositions
May 14th, 1996
US Patent: 5,516,819, 14th May 1996
D R Blackburn, S F Bush, J M Methven
Abstract
A method of producing a thickened organic polymeric composition useful for molding and capable of resisting post-molding shrinkage after being crosslinked comprising a cross-linkable base resin dissolved in an unsaturated monomer, and an additive resin selected from saturated polyesters and saturated amide waxes, the additive resin being crystalline at ambient temperatures and having a melting point (Tm) below a temperature (Tc) at which the base resin cross-linking reaction proceeds at a significant rate. The base resin and additive resin have only a partial degree of compatibility. When cooled from a temperature between Tm and Tc to temperature between Tm and ambient the composition thickens, whereas, when it is heated to a temperature below Tc, it reverts to a flowable composition.
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