Polymer compositions

Details Polymer compositions Polymer compositions

C - Chemistry, Metallurgy

08

L

400/4003

C08L 33/04 (2006.01) C08G 18/48 (2006.01) C08J 3/00 (2006.01) C08J 3/24 (2006.01) C08L 63/10 (2006.01) C08L 67/06 (2006.01) C08L 75/04 (2006.01) C08L 75/16 (2006.01)

Patent

CA 1331815

ABSTRACT Polymer compositions useful for moulding comprise a cross-linkable base resin, an unsaturated monomer in which the base resin is disolved and saturated additive resin which by itself is crystalline at ambient temperatures with a melting point (Tm) below that temperature (Tc) at which the base resin cross-linking reaction is designed to proceed at a significant rate. The composition is such that on cooling from a temperature between Tm and Tc, to a temperature between Tm and ambient the additive resin forms distributed microcrystalline domaine connected severally by chains of the additive resin threading through the base resin chains. This producees a thicking network which may be reversibly broken down to the original additive resin molecules by heating to a temperature below Tc. The additive resin molecules swell the permanent base resin network created by the said cross-linking reaction which occurs during moulding, and thereby providing resistance to post-moulding shrinkage.

586973

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