Electrically insulated coil

An electrically insulated coil comprising:

• a coil;
• and
• a mica tape containing a resin composition wound about said coil;
• said resin composition comprising an epoxy resin, an aluminum complex curing catalyst having the formula:
• ##STR5## wherein R.sub.1 and R.sub.2 independently are each an alkyl group, e and f are 0, 1, 2 or 3 with the total of e+f not exceeding 3 and wherein B is a ligand selected from the group consisting of:
• ##STR6## wherein groups R.sub.3 -R.sub.8 independently of one another are alkyl, and a silane compound curing accelerator of the formula:
• ##STR7## wherein R and R' independently of one another are alkyl, phenyl, aralkyl, vinyl or allyl, q and r are 0, 1, 2 or 3 with the sum of q and r not exceeding 3 or a polysiloxane curing accelerator of the formula:
• ##STR8## wherein groups R.sub.1 -R.sub.7 independently of each other are a monovalent organosiloxane group optionally substituted by alkyl, phenyl, vinyl, aralkyl, allyl or hydroxyl;
• each of s, t, x and y, being 0, 1 or 2 with the sum of s+t and the sum of x+y each not exceeding 2, u and w each being 0, 1 or 2 and a and b each being 0 or an integer of 1 or more, said curing catalyst being present in said composition in an amount of 0.1 to 5% by weight based on the epoxy resin, and said curing accelerator being present in said composition in an amount of 0.1 to 10% by weight based on said epoxy resin;
• and
• curing said composition by heating the same after said mica tape is wound around said coil.