Synthetic resin and insulated products produced therewith

Claim 1

AN INSULATED CONDUCTOR COMPRISING, IN COMBINATION, AN ELECTRICAL CONDUCTOR AND CURED SOLID RESINOUS INSULATION APPLIED TO THE CONDUCTOR, THE RESINOUS INSULATION COMPRISING THE COPOLYMER OF (A) FROM 95 TO 60 PARTS BY WEIGHT OF THE POLYESTER-AMIDE OF (A) FROM 3 TO 4.5 MOLES OF AN ETHYLENICALLY UNSATURATED DICARBOXYLIC ACID, (B) FROM 0.5 TO 2.0 MOLES OF AN ACIDIC COMPOUND HAVING NO ETHYLENIC UNSATURATION SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC DICARBOXYLIC ACIDS AND THEIR ANHYDRIDES, HAVING AT LEAST TWO NON-CARBOXYL CARBON ATOMS AND HAVING NO OTHER REACTIVE GROUPS THAN THE CARBOXYL OR ANHYDRIDE GROUPS, (C) FROM 1.5 TO 4.7 MOLES OF AT LEAST ONE PRIMARY AMINE ALCOHOL SELECTED FROM THE GROUP CONSISTING OF MONOETHANOLAMINE AND MONOISOPROPANOLAMINE, (D) UP TO 0.6 MOLE OF AT LEAST ONE PRIMARY DIAMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE DIAMINE, PROPYLENE DIAMINE AND UREA, THE SUM OF THE MOLES OF THE (C) PRIMARY AMINE-ALCOHOL AND THE (D) PRIMARY DIAMINO COMPOUND EQUALING AT LEAST 2.2 AND NOT EXCEEDING 4.7, AND (E) FROM 1 TO 2.4 MOLES OF AT LEAST ONE POLYHYDRIC ALCOHOL, NOT OVER 75 MOLE PERCENT OF THE POLYHYDRIC ALCOHOL HAVING MORE THAN THREE REACTANTS (A), GROUPS, THE PROPORTIONS OF THE REACTANTS (A), (B), (C), (D) AND (E) BEING SELECTED SO THAT THE CARBOXYL GROUPS DO NOT SUBSTANTIALLY EXCEED A 10% STOICHIOMETRIC EXCESS OVER THE TOTAL NUMBER OF HYDROXY AND AMINE GROUPS, AND THE TOTAL NUMBER OF HYDROXY AND AMINE GROUPS DO NOT SUBSTANTIALLY EXCEED A 20% STOICHIOMETRIC EXCESS OVER THE NUMBER OF CARBOXYL GROUPS, THE REACTANTS HAVING BEEN ADMIXED AND HEATED TO A TEMPERATURE OF AT LEAST 100* C. FOR A PERIOD SUFFICIENT TO PRODUCE A RESIN OF A BALL AND RING SOFTENING TEMPERATURE OF NOT OVER 90* C., AND (B) FROM 5 TO 40 PARTS BY WEIGHT OF A RESINOUS EPOXIDE WHICH IS THE POLYETER DERIVATIVE OF A POLYHYDRIC PHENOL AND CONTAINS AN AVERAGE OF MORE THAN ONE EPOXIDE GROUP PER MOLECULE AND IS ESSENTIALLY FREE FROM FUNCTIONAL GROUPS OTHER THAN THE EPOXY AND HYDROXY GROUPS, THE RESINOUS EPOXIDE HAVING A BALL AND RING SOFTENING TEMPERATURE OF FROM 40* C. TO 140* C., SAID COPOLYMER HAVING BEEN PRODUCED BY HEATING THE MIXTURE OF (A) AND (B) TO REACT IT TO A BALL AND RING SOFTENING TEMPERATURE OF FROM 27* C. TO 55* C. FOR A 70% SOLUTION THEREOF IN CRESOL.