E.i. Dupont De Nemours and Company

Other

Herbert G Lauterbach

Richard K Okine

David H Edison

James R Layton

Thomas E Armiger

Peter E Frankenburg

Floyd H Fish

By Richard Breen, Administrator

Alvin L Breen, Deceased

A coating of a viscous lubricant applied prior to stretch-breaking permits forming slivers of stretch-broken carbon fibers. When an anti-static ingredient is added to the viscous lubricant cohesive slivers of stretch-broken glass fibers can be formed. Composites of matrix resin reinforced with these slivers exhibit high strength, tensile stiffness, and good formability.

Composites of stretch broken aligned fibers of carbon and glass

Comosites of stretch broken aligned fibers of carbon and glass

A coating of a viscous lubricant applied prior to stretch-breaking permits forming slivers of stretch-broken carbon fibers. When an anti-static ingredient is added to the viscous lubricant cohesive slivers of stretch-broken glass fibers can be formed. composites of matrix resin reinforced with these slivers exhibit high strength, tensile stiffness, and good formability.

A garment for protection against molten metals is constructed of a composite fabric having an area weight of no more than 1000 g/m.sup.2 comprised of an outer layer which is a visually continuous, optically opaque sheet of poly(tetrafluoroethylene) fibers having an area weight of at least 170 g/m.sup.2 securely attached throughout its interface with an inner durable fabric layer of non-fusible, textile fibers having an area weight of 70-700 g/m.sup.2.

Foundry workers' protective garment

A composite comprising a matrix resin reinforced with a sliver of high modulus p-aramid fibers of which at least 10% of the fiber ends are fibrillated into at least 2 fibrils along a terminal length which is at least 5 times as long as the diameter of the unfibrillated portion of the fiber.

Composites reinforced with high strength aramid fibers having

High strength, high modulus, continuous filament aromatic polyamide yarns are stretch broken under high tension while being sharply deflected in a lateral direction by mechanical means to provide a sliver which is processed by conventional means to a high strength, high modulus spun yarn. The broken ends of the fibers are highly fibrillated to fibrils having lengths of 50-350 times the diameter of the unfibrillated portion of each fiber.

Process for preparing a high strength aramid spun yarn

High strength aramid spun yarn

Process and apparatus are disclosed for jettexturing yarn of continuous filaments to increase the bulk. Thermoplastic filaments are crimped by forwarding the yarn in a jetted stream of hot compressible fluid, such as heated air or steam onto a moving screen or other foraminous surface and cooling the yarn on the surface prior to imposing any substantial tension on the filaments. Products having especially desirable properties are obtained by treating filaments which develop crimp due to differential shrinkage properties when heat-relaxed, e.g., bicomponent filaments or meltspun filaments which have been quenched asymmetrically by directing cold fluid across the spinneret face.

Growing community of inventors

Wilmington, DE, United States of America

Herbert G Lauterbach