E.i. Dupont De Nemours and Company

Mishima Paper Ltd.

Lee J Hesler

Gary Lee Hendren

Arnold Frances

James Edmond Van Trump

Ippei Kato

Yuji Kimura

Philip P Burks, Jr

Stanley C Park

Rita M Vasta

Dexter L Atkinson

Aramid sheet material and parts molded therefrom comprising m-aramid fibrids containing up to 10% by weight dyes that are thermally stable up to the glass transition temperature of the m-aramid polymer and p-aramid or m-aramid short fibers.

Molded aramid sheets

Aramid paper with high surface smoothness

A multi-layered smooth-calendered surface aramid paper with high break strength and tear resistance comprises a substrate layer and at least one surface layer intimately bonded to the substrate layer, wherein the surface layer(s) consists essentially of 65 to 90% by weight aramid fibrids and 10 to 35% by weight aramid floc and comprises 10 to 67% of the total basis weight of the paper.

Layered smooth surface aramid papers of high strength and printability

Polymeric fibrids reinforce elastomers to yield well-blended products of high modulus and elongation.

Fibrid reinforced elastomers

A laminate for honeycomb structures comprised of two outside layers having good surface adhesion and a tough core layer, said core constituting from 50 to 70% by weight of the laminate and containing from about 60 to 80% by weight of poly(m-phenylene isophthalamide) fibrids and each outside layer constituting from 15 to 25% by weight of the laminate and containing about 60 to 70% by weight of floc.

Tough layered papers with improved surface adhesion

A thickener for liquids is disclosed. The thickener consists of organic polymer fibrid particles with a very small size, a very high aspect ratio, and very low bulk density. The thickener is made by drying newly-coagulated fibrid particles in a way that results in high particulate surface area.

Method of making fibrids

An aramid paper which has high porosity while exhibiting the usual tensile properties is disclosed. The paper has good saturability and a smooth surface while retaining high break strength.

Aramid papers containing aramid paper pulp

A process for making a wet-laid, elongate, nonwoven flexible sheet having an additive distributed in a predetermined cross-directional pattern includes providing two synthetic fibrous stocks containing the additive in a concentration higher in one stock than in the other stock. The stocks are supplied to a paper machine having a headbox for depositing the stocks on a wire to form a wet sheet with the stocks being introduced into the headbox from a plurality of cross-directional positions equally spaced-apart along the headbox with a generally equal amount of solids being introduced at each position and with the stock with the higher concentration being introduced in higher quantity than the other stock at least at one cross-directional position so that the additive is distributed in the predetermined cross-directional pattern.

Growing community of inventors

Richmond, VA, United States of America

Lee J Hesler