PURPOSE: To provide a novel thermosetting resin composition having excellent heat resistance and flexibility, useful as a heat-resistant insulation varnish, etc., and containing a polyfunctional epoxy compound and a polyfunctional α-ketonitrile compound.
CONSTITUTION: The objective thermosetting resin composition is prepared by compounding a polyfunctional epoxy compound (e.g. bisphenol A diglycidyl ether) and a polyfunctional α-ketonitrile compound (e.g. phthaloyl cyanide), adding a curing catalyst (e.g. boron trifluoride), and if necessary, a filler, a pigment, a solvent, etc. to the composition. The composition can be cured easily by heating at 0W400°C for 1W200hr.
EFFECT: The cured resin has excellent electrical properties, chemical resistance, impact resistance, and self-extinguishing properties.
SUZUKI KATSUTO
MUKAI JIYUNJI
