Polymerizable resinous composition comprising an unsaturated polyester and a mixture of ethylenically unsaturated monomers copolymerizable therewith, electrical member impregnated therewith, and method of preparing same

Claim 1

A POLYMERIZABLE RESINOUS COMPOUND COMPOSITION COMPRISING (A) FROM 10% TO 90% BY WEIGHT OF A MIXTURE OF (1) FROM 25% TO 40% BY WEIGHT OF THE RESINOUS REACTION PRODUCT DERIVED BY REACTING AN ADMIXTURE (A) FROM 1 MOL TO 8 MOLS OF AT LEAST ONE SATURATED DICARBOXYLIC ACID COMPONENT SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS AND ANHYDRIDES THEREOF HAVING AN AVERAGE OF FROM 4 TO 12 CARBON ATOMS PER MOLECULE, (B) ONE MOL OF AT LEAST ONE THEYLENICALLY UNSATURATED ACIDIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS AND ANHYDRIDES THEREOF, AND (C) FROM 2 MOLS TO 9 MOLS OF A POLYHDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS HAVING AN AVERAGE OF FROM 2 TO 8 CARBON ATOMS PER MOLECULE, THE NUMBER OF MOLS OF (C) BEING SUBSTANTIALLY EQUAL TO THE TOTAL NUMBER OF MOLS OF (A) AND (B) AND (2) FROM 75% TO 60% BY WEIGHT OF THE RESINOUS REACTION PRODUCT DERIVED BY REACTING (A) ABOUT ONE MOL OF THE REACTION PRODUCT OF A DIHYDRIC PHENOL AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF ALKYLENE OXIDES ANDALKYLENE HALOHYDRINS, SUCH REACTION PRODUCT HAVING ONLY TWO REACTIVE ALCOHOLIC HYDROXYL GROUPS, AND (B) ABOUT ONE MOL OF AT LEAST ONE OLEFINICALLY UNSATURATED ACIDIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS AND ANHYDRIDES THEREOF, AND (B) FROM 90% TO 10% BY WEIGHT OF A MIXTURE OF (1) FROM 10 PARTS TO 90 PARTS BY WEIGHT OF A MIXLEAST ONE LIQUID REACTIVE UNSATURATED MONOMER HAVING THE GROUP >C=C< CAPABLE OF VINYL-TYPE POLYMERIZATION WITH UNSATURATED POLYESTERS, SAID MONOMER HAVING A BOILING POINT IN EXCESS OF ABOUT 160* C.AND FORMING, WHEN ALONE, A RELATIVELY VISCOUS COMPOSITION WITH MIXTURE (A), AND (2) FROM 90 PARTS TO 10 PARTS BY WEIGHT OF AT LEAST ONE RELATIVELY MORE VOLATILE AND LOW VISCOSITY LIQUID REACTIVE UNSATURATED MONOMER HAVING THE GROUP >C=C< CAPABLE OF VINYL-TAPE POLYMERIZATION WITH UNSATURATED POLYESTERS, SAID MONOMER HAVING A BOILING POINT OF LESS THAN ABOUT 100* C., THE SAID MONOMER (2) BEING PRESENT IN AN AMOUNT TO PROVIDE A COMPOSITE RESIN COMPOSITION HAVING A VISCOSITY OF FROM 5 CPS.TO 40 CPS.AT 25* C.