E.i. Dupont De Nemours and Company

Edward G Howard

David C England

Arthur Z Moss

Walter John Simmons

Albert Gordon Anderson

Stuart Marshall Nemser

Ralph Birchard Lloyd

Walter Mahler

Raymond F Tietz

Robert L Adelman

Frank D Marsh

Stephen Li

Patrick T Shannon

Thomas C O'Brien

Shaun Terrance Einar Mesher

Christos Sarafidis

The present invention provides for a solid polymer electrolyte membrane having a fluorinated ionomer having imbibed therein a non-fluorinated, non-ionomeric polymer, wherein the fluorinated ionomer comprises at least 6 mole % of monomer units having a fluorinated pendant group with a terminal ionic group, and wherein the non-ionomeric polymer is selected from the group consisting of a polyamine, a polyvinyl amine, and derivatives thereof. The invention also provides a catalyst coated membrane and a fuel cell having this solid polymer electrolyte membrane.

Solid polymer membrane for fuel cell with polyamine imbibed therein for reducing methanol permeability

The invention discloses a process for the desulfurization of petroleum products by contacting with acidic organic polymers. Preferably, highly fluorinated and, most preferably, perfluorinated acidic organic polymers are used.

Desulfurization of petroleum products

High-surface-area polyolefins grafted with certain fluoroalkylvinylether sulfonate or carboxylate monomers, and their method of preparation, are disclosed. Such materials are usefuli as catalysts and as membranes in electrochemical cells.

(Fluorovinyl ether)-grafted high-surface-area polyolefins and

Water-bouyant particulate materials containing micronutrients for

Tine for a manual brushing-comb

High-surface-area polyolefins grafted with certain fluoroalkylvinylether sulfonate or carboxylate monomers, and their method of preparation, are disclosed. Such materials are useful as catalysts and as membranes in electrochemical cells.

Process for preparing an ultrahigh molecular weight linear polyethylene (UHMWLPE) by heating the material to above 280.degree. C. at atmospheric pressure in an inert environment. The treated polymer is then gradually cooled in this same atmosphere.

Ultra high molecular weight linear polyethylene processes of manufacture

The invention provides shaped, substantially unoriented, compositions of PTFE, having high notched Izod impact resistance, produced in a hot compression molding process wherein heat and pressure are applied simultaneously in a selected temperature range below the melting point of the virgin, as polymerized PTFE powder.

Impact resistant polytetrafluoroethylene and preparation thereof

Novel ultrahigh molecular weight linear polyethylene (UHMWLPE) in the form of a shaped article, exhibiting a unique combination of properties making the material useful as a bearing surface, in general, but particularly useful as a prosthetic hip joint cup and as other prosthetic shapes for replacement of other joints of the human body, A novel process for preparing this article is also disclosed.

Ultrahigh molecular weight linear polyethylene and articles thereof

What is provided is an annealed, linear, high density polyethylene (LHDPE) and a process for the preparation of tough impact resistant articles made of such materials.

Annealed linear high density polyethylene and preparation thereof

Shaped PTFE compositions are disclosed having low creep which are produced by the application of pressure and elevated temperature. Also disclosed is a process for making shaped compositions with low creep by the application of pressure and elevated temperature.

Polytetrafluoroethylene with improved creep resistance, and preparation

A homogeneous composite is provided comprising (a) about 10 to 99.5% by weight of an ultrahigh molecular weight linear polyethylene having a molecular weight of at least about 400,000, a crystalline melting point of greater than 143.degree. C., the reduction of said melting point upon remelting being at least 3.degree. C., and a crystal morphology comprising a bimodal distribution of molecular chain fold spacings reflecting significant populations of both folded and very highly extended molecular chains, and (b) about 0.5 to 90% by weight of at least one filler compound having a neutral-to-acidic surface, said polyethylene being polymerized onto the surface of said filler, and said composite being substantially free of polymer-free filler and of filler-free polymer. Also provided are processes for the preparation of such composites.

Homogeneous, high modulus ultrahigh molecular weight polyethylene

Homogeneous, particulate composites are provided, of about 75-99.5 weight percent ultrahigh molecular weight polyethylene (UHMWPE) and about 0.5-25 weight percent of at least one filler compound, and wherein the composites have a surface area of at least about 4 m.sup.2 /g. The particulate UHMWPE is also provided without the filler. Dense, load-bearing articles of these materials are formed by cold-pressing and free-sintering procedures. Cold-pressable, free-sinterable blends of commercial UHMWPE containing at least 25 weight percent of the composites or unfilled UHMWPE of the invention are also provided.

Ultrahigh molecular weight polyethylene and lightly-filled composites

Ceramic compositions comprising a distillable binder, shaped articles formed therefrom and a method for making said compositions and for forming the shaped articles.

Growing community of inventors

Hockessin, DE, United States of America

Edward G Howard