| abstract |
A moulding composition is prepared by partially reacting a fluid mixture comprising 1. FROM 10% TO 90% BY WEIGHT OF POLYURETHANE PRECURSORS COMPRISING AT LEAST ONE POLYFUNCTIONAL COMPOUND CONTAINING AT LEAST TWO ISOCYANATE-REACTIVE GROUPS, AT LEAST ONE POLYISOCYANATE, AND AT LEAST ONE ETHYLENICALLY UNSATURATED COMPOUND CONTAINING AT LEAST ONE GROUP REACTIVE WITH THE POLYFUNCTIONAL COMPOUND AND/OR WITH THE POLYISOCYANATE, THE ETHYLENICALLY UNSATURATED COMPOUND BEING COPOLYMERISABLE WITH THE ETHYLENICALLY UNSATURATED MONOMER IN (2) AND HAVING A MOLECULAR WEIGHT OF NOT GREATER THAN 750, AND 2. FROM 90% TO 10% BY WEIGHT OF POLYESTER RESIN PRECURSORS COMPRISING AT LEAST ONE ETHYLENICALLY UNSATURATED POLYESTER AND AT LEAST ONE ETHYLENICALLY UNSATURATED MONOMER COPOLYMERISABLE THEREWITH, IN THE MIXTURE OF POLYFUNCTIONAL COMPOUND, THE POLYISOCYANATE AND THE ETHYLENICALLY UNSATURATED COMPOUND BEING REACTED WITH EACH OTHER, THE ETHYLENICALLY UNSATURATED MONOMER BEING SUBSTANTIALLY UNCOPOLYMERISED WITH THE ETHYLENICALLY UNSATURATED COMPOUND AND WITH ETHYLENICALLY UNSATURATED POLYESTER. |