E.i. Dupont De Nemours and Company

M Lana Sheer

John C Solenberger

Lloyd Fox

This invention relates to metal-containing inserts, such as transformers, that are encapsulated, via compression molding processes, with at least one wet lay thermoplastic sheet material and that do not experience significant visible cracking during heat cycling.

Inserts encapsulated with a thermoplastic sheet material via compression

A compression molding process for encapsulating a metal-containing insert with at least one layer of a thermoplastic sheet prepared via a wet lay process. The thermoplastic sheet material contains a thermoplastic polymeric material and a glass fiber material, and the compression molding process includes the steps of

Process for encapsulating inserts with wet-laid material via compression

An encapsulated electrical or electronic device having a first layer of electrically insulating material which is then covered by another layer filled with a thermally conductive material such as mesophase pitch based carbon fibers or graphite particles. Both layers are of the same base resin.

Article of manufacture

An encapsulated electrical or electronic device having a first layer of electrically insulating material which is then covered by another layer filled with thermally conductive fibers such as mesophase pitch based carbon fibers. Both layers are of the same base resin.

A process for manufacturing a polymeric encapsulated 'E' core transformer, a polymeric encapsulated 'C' core transformer, and a polymeric encapsulated toroidal shaped transformer, said process requiring considerably less time to complete than do conventional transformer manufacturing processes.

Process for manufacturing a polymeric encapsulated transformer

An electrical coil form having a UL 1446 rating greater than 200.degree. C. is formed from either a thermoplastic or thermosetting resin material reinforced with continuous or long chopped or stretch broken aramid or glass fibers or aramid paper.

Composite coil forms for electrical systems

A polybutylene terephthalate homopolymer or copolymer molding blend having good impact resistance is obtained by incorporating into the resin a selected organic compound and an ethylene polymer.

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Chadds Ford, PA, United States of America

M Lana Sheer