Molded products for high voltage apparatus comprising brominated epoxy resins

In a molded transformer, the improvement comprising producing a molded transformer having excellent crack resistance and high reliability by using an epoxy resin composition for molding comprising:

• an epoxy resin (A) comprising from 50 to 100% by weight of an epoxy resin (A-2) represented by the general formula (II):
• ##STR33## wherein each of R.sup.1 is independently hydrogen atom or methyl group, each of x is independently an integer of 1 to 4, and the average of y is 0 to 4;
• and at least one resin selected from the group consisting of a bisphenol A epoxy resin, a bisphenol F type epoxy resin, and a biphenyl epoxy resin;
• an acid anhydride (B);
• a curing accelerator (C);
• at least one coupling agent (D) selected from the group consisting of epoxysilane coupling agents, phenylaminosilane coupling agents, mercaptosilane coupling agents and titanate coupling agents;
• and
• a filler (E) comprising at least one of silica fillers or alumina fillers,
• wherein the ratio of the number of acid anhydride groups of said acid anhydride (B) to the number of epoxy groups of said epoxy resin (A) is 0.5 to 1.5, the amount of said curing accelerator (C) is 0.5 to 10 parts by weight based on 100 parts by weight of said epoxy resin (A), the amount of said coupling agent (D) is 0.05 to 5 parts by weight based on 100 parts by weight of said filler (E), and the content of said filler (E) is 35 to 95% by weight of the resin composition.

In a molded motor, the improvement comprising producing a molded motor having excellent crack resistance and high reliability by using an epoxy resin composition for molding comprising:

• an epoxy resin (A) comprising from 50 to 100% by weight of an epoxy resin (A-2) represented by the general formula (II):
• ##STR34## wherein each of R.sup.1 is independently hydrogen atom or methyl group, each of x is independently an integer of 1 to 4, and the average of y is 0 to 4;
• and at least one resin selected from the group consisting of a bisphenol A epoxy resin, a bisphenol F type epoxy resin, and a biphenyl epoxy resin;
• an acid anhydride (B);
• a curing accelerator (C);
• at least one coupling agent (D) selected from the group consisting of epoxysilane coupling agents, phenylaminosilane coupling agents, mercaptosilane coupling agents and titanate coupling agents;
• and
• a filler (E) comprising at least one of silica fillers or alumina fillers,
• wherein the ratio of the number of acid anhydride groups of said acid anhydride (B) to the number of epoxy groups of said epoxy resin (A) is 0.5 to 1.5, the amount of said curing accelerator (C) is 0.5 to 10 parts by weight based on 100 parts by weight of said epoxy resin (A), the amount of said coupling agent (D) is 0.05 to 5 parts by weight based on 100 parts by weight of said filler (E), and the content of said filler (E) is 35 to 95% by weight of the resin composition.

A bushing or a spacer which is produced from an epoxy resin composition comprising:

• an epoxy resin (A) comprising from 50 to 100% by weight of an epoxy resin (A-2) represented by the general formula (II):
• ##STR35## wherein each of R.sup.1 is independently hydrogen atom or methyl group, each of x is independently an integer of 1 to 4, and the average of y is 0 to 4;
• and at least one resin selected from the group consisting of a bisphenol A epoxy resin, a bisphenol F type epoxy resin, and a biphenyl epoxy resin;
• an acid anhydride (B);
• a curing accelerator (C);
• at least one coupling agent (D) selected from the group consisting of epoxysilane coupling agents, phenylaminosilane coupling agents, mercaptosilane coupling agents and titanate coupling agents;
• and
• a filler (E) comprising at least one of silica fillers or alumina fillers,
• wherein the ratio of the number of acid anhydride groups of said acid anhydride (B) to the number of epoxy groups of said epoxy resin (A) is 0.5 to 1.5, the amount of said curing accelerator (C) is 0.5 to 10 parts by weight based on 100 parts by weight of said epoxy resin (A), the amount of said coupling agent (D) is 0.05 to 5 parts by weight based on 100 parts by weight of said filler (E), and the content of said filler (E) is 35 to 95% by weight of the resin composition.