Patent ID: 8314342

Claim:
An insulation coil in which an insulating mica tape is wound around a conductor of a prescribed configuration to make a single insulation coil, and said single insulation coil is impregnated with an epoxy resin composition comprising an epoxy resin and an acid anhydride curing agent, followed by curing of said resin composition, wherein said insulating mica tape has a reinforcing layer, mica secured to said reinforcing layer, and a curing catalyst comprising zinc naphthenate and an epoxy adduct imidazole that has been provided on both said reinforcing layer and said mica, wherein the amount of coating of the epoxy adduct imidazole on said mica tape is 0.3 to 5 g/m 2 and the amount of coating of zinc naphthenate is 1 to 10 g/m 2 .