Alliedsignal Inc.

Allied Corporation

Allied Chemical Corporation

Other

Allies-signal Inc.

Dusan C Prevorsek

Gary A Harpell

Sheldon Kavesh

Young D Kwon

Sajal Das

Hsin L Li

Igor Palley

Raj K Sharma

Kwok W Lem

Hong B Chin

Bruce T DeBona

Murali K Akkapeddi

Thomas Y Tam

Gene C Weedon

James J Dunbar

Robert C Wincklhofer

Yu-Chin Lai

Kwang Soo Kim

Shaul M Aharoni

Max Wilhelm Gerlach

Tse C Wu

David H Wertz

Daniel C Chung

Yali Kesten

George J Schmitt

Leon Segal

Lester T Lee

Leroy C Lin

Seong K Rhee

David V Cunningham

Das Sajal

David Wertz

Edward T Gilliam

William J Bulger

Donald G Wang

Solutions of intermediate molecular weight polymers from about 200,000 to about 4,000,000, such as polyethylene, in a relatively non-volatile solvent are extruded through an aperature at constant concentration and thereafter stretched at a ratio of at least about 3:1 prior to cooling to form a first gel. The first gels are extracted with a volatile solvent to form a second gel, and the second gel is dried to form a low porosity xerogel. Stretching occurs with any one or more of the first gel, second gel or xerogel. The polyethylene products produced by our process include products having a molecular weight between about 200,000 and about 4,000,000 a tenacity of at least about 13 grams/denier, a modulus of at least about 350 gram/denier, a porosity of less than 10% by volume, a crystalline orientation function of at least about 0.95, and a main melting temperature of at least about 140.degree. C.

Shaped polyethylene articles of intermediate molecular weight and high

By poststretching, at a temperature between about 135.degree. and 160.degree. C., a polyethylene fiber, which has already been oriented by drawing at a temperature within 5.degree. C. of its melting point, an ultra high modulus, very low creep, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures is obtained. The poststretching can be in multiple stages and/or with previous annealing. The poststretching should be done at a draw rate of less than 1 second.sup.-1. Tensile modulus values over 2,000 g/d for multifilament yarn are consistently obtained for ultrahigh molecular weight polyethylene, with tensile strength values above 30 g/d while at the same time dramatically improving creep (at 160.degree. F. (71.1.degree. C.) and 39,150 psi load) by values at least 25% lower than fiber which has not been poststretched. Shrinkage is improved to values less than 2.5% of the original length when heated from room temperature to 135.degree. C. Performance at higher temperature is improved by about 15.degree. to 25.degree. C.

Very low creep, ultra high modulus, low shrink, high tenacity polyolefin

Method of making a high molecular weight polyolefin article

A flexible article of manufacture especially suitable for use as a ballistic resistant body armor which comprises two or more layers, at least one of said layers being a fibrous layer, and at least one of said layers being a polymeric layer in contact with and bound to all or portion of said fibrous layer.

Ballistic resistant fabric articles

A rigid improved penetration resistant composite of the type comprising a plurality of fibrous layers comprising network of fibers in a polymeric matrix selected from the group consisting of thermoplastic polymers, thermosetting resins or a combination thereof, at least two of said layers secured together by a securing means, said improvement comprising a securing means which comprises fiber stitches wherein the average stitch length is greater than the average stitch path, a process for forming the composite and articles fabricated from said composite.

Constructions having improved penetration resistance

By poststretching, at a temperature between about 135.degree. and 160.degree. C., a polyethylene fiber, which has already been oriented by drawing at a temperature within 5.degree. C. of its melting point, an ultra high modulus, very low creep, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures is obtained. The poststretching can be in multiple stages and/or with previous annealing. The poststretching should be done at a draw rate of less than 1 second.sup.-1. Tensile modulus values over 2,000 g/d for multifilament yarn are consistently obtained for ultrahigh molecular weight-polyethylene, with tensile strength values above 30 g/d while at the same time dramatically improving creep (at 160.degree. F. (71.1.degree. C.) and 39,150 psi load) by values at least 25% lower than fiber which has not been poststretched. Shrinkage is improved to values less than 2.5% of the original length when heated from room temperature to 135.degree. C. Performance at higher temperature is improved by about 15.degree. to 25.degree. C.

This invention relates to a carbon-carbon composite material formed by applying a vertical compressive force and a variable lateral force simultaneously to a mixture of carbon fiber and a carbon precursor material during carbonization of the mixture.

Carbon fiber-reinforced carbon composite material

An improved rigid composite of the type comprising a plurality of fibrous layers at least two of which are secured together by a securing means, said improvements comprising a securing means which comprises at least two adjacent paths.

This invention relates to a fire resistant multilayer complex ballistic resistant article comprising at least one first layer comprised a plurality of flammable fibers a first matrix and at least one second layer which is adjacent to said first layer which comprises a plurality of fire resistant fibers in a second matrix, wherein the second matrix comprises a fire retardant material and is different from the first matrix material.

Fire resistant ballistic resistant composite armor

The present invention is a cyanato group containing phenolic resin, and method to prepare the resin. The resin of the present invention is stable and has a long shelf life. This is indicated by the gel time of greater than 1 minute, preferably greater than 2 minutes, more preferably greater than 10 minutes. The resin has substantially no smoke generation during gel time measurement at 155.degree. C.

Cyanato group containing phenolic resins, phenolic triazines derived

Process for the catalytic conversion of low molecular weight aromatic

The present invention relates to high strength, high modulus polyethylene filaments which form composites having improved shear strength and composites formed from said filaments.

Rigid polyethylene reinforced composites having improved short beam

A method of forming a carbon composite material by applying vertical compressive force and a variable lateral force simultaneously to a mixture of carbon fiber and a carbon precursor material during carbonization of the mixture.

Process for fabrication of carbon fiber-reinforced carbon composite

A flexible composite of manufacture especially suitable for use as a ballistic resistant body armor. An improved penetration resistant composite of the type comprising at least one substrate layer having one or more planar bodies affixed to a surface thereof, the improvement comprising laminated planer bodies comprising at least two layers, at least one or said layers being a metal layer positioned on the impact side of said bodies exposed to said threat and at least one of said layers being a fibrous layer comprising a fiber network in a polymeric matrix.

Penetration and blast resistant composites and articles

Growing community of inventors

Morristown, NJ, United States of America

Dusan C Prevorsek