E.i. Dupont De Nemours and Company

John C Solenberger

M Lana Sheer

Lloyd Fox

Michael S Withers

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 cation permeable membrane containing areas of thin wall construction comprises a cation exchange polymer matrix having a reinforcement fabric embedded therein. A two-step lamination procedure is described where holes are formed in a film of laminated polymer prior to a second lamination step. The cation permeable membrane has utility in membrane ion exchange, reverse osmosis devices or in electrolytic cells such as chlor-alkali cells.

Process for cation permeable membrane with reinforcement fabric embedded

Stable, fluid polyvinyl alcohol-containing microgels in water having a Brookfield viscosity of 1.15 to 1000 centipoises may be prepared more economically from a dry blend which comprises (A) a polymer mixture consisting of at least about 0.5% by weight of polyvinyl alcohol and one or more polysaccharide selected from the group consisting of up to about 99.5% by weight of starch and up to about 33% by weight of sodium carboxymethylcellulose, said polyvinyl alcohol having a Hoeppler viscosity of about 4 to 150 centipoises and having at least about 50 mole percent of the monomeric units present as vinyl alcohol units, (B) water-soluble, solid titanium salt of a hydroxy carboxylic acid of 2 to 10 carbon atoms in an amount which provides about 0.05 to 10 parts by weight of tetravalent titanium ions per 100 parts of polymer mixture, and (C) about 0.05 to 20 parts by weight of water-soluble, solid hydroxy carboxylic acid of 2 to 10 carbon atoms per 100 parts of polymer mixture.

Polyvinyl alcohol microgel precursor blends

Mixture of polyvinyl alcohol-polysaccharide microgel in water comprising water and, based on the total mixture, about 0.1 to 10 percent by weight of a partially crosslinked mixture of polyvinyl alcohol and polysaccharide in which the mixture is partially crosslinked with titanium ions, said polyvinyl alcohol being present in an amount of 0.05 to 9.95 percent by weight, said polysaccharide being present in the amount of about 0.05 to 9.95 percent by weight and being selected from the group consisting of about 0.05 to 9.95 percent by weight of starch and about 0.05 to 3 percent by weight of sodium carboxymethylcellulose, said microgel being a stable fluid derived from polyvinyl alcohol which has a Hoeppler viscosity of about 4 to 150 centipoises and in which at least about 50 mole percent of the monomeric units are vinyl alcohol units, the water and partially crosslinked mixture of polyvinyl alcohol and polysaccharide having a Brookfield viscosity of about 1.15 to 1000 centipoises, the viscosity being at least about 15 percent greater than the viscosity of the aqueous polyvinyl alcohol-polysaccharide mixture from which the microgel is derived. The microgels are useful as size for paper, as paper coatings, as warp size for textile fibers, and as adhesives.

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Wilmington, DE, United States of America

John C Solenberger