Polymeric compositions

Details Polymeric compositions Polymeric compositions

1994-08-19

1996-03-05

Short, Patricia A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524227, 525 28, 525 43, 525 49, 523527, C08L 6706, C08L 7516

Patent

active

054968739

ABSTRACT:
A thickened organic polymeric composition useful for molding and capable of resisting post-molding shrinkage after being cross-linked comprises 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 (T.sub.m) below a temperature (T.sub.c) 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 T.sub.m and T.sub.c to a temperature between T.sub.m and ambient the composition thickens, whereas, when it is heated to a temperature below T.sub.c, it reverts to a flowable composition.

REFERENCES:
patent: 3994853 (1976-11-01), Hindersinn et al.
patent: 4895895 (1990-01-01), Osborne et al.
38-Plastics Fabr. Uses, vol. 108, 1988, p. 57.
S. F. Bush, J. M. Methven & D. R. Blackburn, "Networks as the Basis of Pre-Thickening SMC", Biological and Synthetic Polymer Networks, pp. 321-334 (1988).

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