E.i. Dupont De Nemours and Company

Other

The Chemours Company Fc, LLC

Robert Thomas Young

Sundar Kilnagar Venkataraman

John L Netta

Gary Thuot

Robert Kenny

William Cheng Uy

Ralph Munson Aten

Heidi Elizabeth Burch

Edward William Tokarsky

Jennifer Leigh Thompson

Lorraine A Townsend

Johnnie F Turner

Jennifer L Thompson

Katie Lynn Campbell

A foamable fluoropolymer composition containing foam cell nucleating agent is provided, wherein the fluoropolymer comprises melt-fabricable tetrafluoroethylene-/hexafluoropropylene copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein the alkyl contains 1 to 4 carbon atoms, wherein the melting temperature of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer is no more than 35&#xb0; C. greater than the melting temperature of said tetrafluoroethylene/hexafluoropropylene copolymer, and/or wherein said tetrafluoroethylene/hexafluoropropylene copolymer and said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer each have a melt flow rate (MFR) within the range of 1 to 40 g/10 min and the MFR of one of said copolymers is at least twice that of the other of said copolymers.

Foamable fluoropolymer composition

The present invention discloses a foamable composition. The foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The foamable composition has a uniform foam cell size where the foam cell size of at least 90% of the foamed cells is 50 micrometers or less. The foam nucleating package ranges from 0.1 to 10 wt % of the combined weight of the perfluoropolymer and the foam nucleating package.

A process of twinning a pair of polymer-insulated conductors to form a twisted pair, where the polymer-insulated conductors are formed by extruding a uniformly thick coating of polymer onto the conductors. More than one twisted pair is encased in a polymer jacket forming a cable. The twisted pair obtains a desirable average impedance performance using a reduced amount by weight of polymer forming said polymer-insulated conductors by: (i) extruding to form longitudinally running peaks and valleys in the exterior surface of each of the polymer-insulated conductors of the pair of polymer-insulated conductors and (ii) twinning resultant polymer-insulated conductors to nest at least one of the peaks in the exterior surface of one of the polymer-insulated conductors in at least one of said valleys in the exterior surface of the other of the polymer-insulated conductors of the pair of polymer-insulated conductors.

Crush resistant conductor insulation

A process for making an extruded foamable composition is disclosed where the foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The process makes a foamed product having uniform foam cell size at high speeds without loss of product quality.

Extrusion of a foamable fluoropolymer

FEP compositions are provided that provide foam insulation in coaxial cable that surpasses the return loss obtained when PFA is used to make the foamed insulation, one composition comprising a blend of tetrafluoroethylene/hexafluoropropylene copolymers, one of said copolymers exhibiting a strip force of at least about 3 lbf (13.3 N) and another of said copolymers exhibiting a strip force no greater than about 2.5 lbf (11.1 N), said blend exhibiting a strip force of at least about 3 lbf (13.3 N), each said strip force being the force necessary to break adhesion between conductor and said one of said copolymers, said another of said copolymers, and said blend, respectively, and another composition comprising tetrafluoroethylene/hexafluoropropylene copolymer having an MFR of no greater than about 16 g/10 min and containing &#x2014;CFend groups and an effective amount of wire affinity end groups to exhibit a strip force of at least about 3 lbf (13.3 N), said strip force being the force necessary to break adhesion between conductor and said copolymer, the coaxial cable exhibiting an average return loss of no greater than about &#x2212;26 dB at 800 MHz to 3 GHz and having a void content of about 20 to 65% and (b) forming an outer conductor over said foamed insulation.

Fluoropolymer wire insulation

Communication cable is provided comprising a twisted pair of polymer insulated conductors, the twisting to form the twisted pair forcing the surface of polymer insulation of each polymer-insulated conductor of said polymer-insulated conductors into contact with one another, the polymer insulation of each polymer-insulated conductor including (i) a foamed portion being crushable by the forcing together of the contacting surfaces of the polymer insulation of each of the polymer-insulated conductors and (ii) a crush-resistant portion extending radially within said insulation into the foamed portion and being present where the surface of the polymer-insulated conductors are into said contact with one another, thereby protecting the foamed portion from crushing by the forcing together of the contacting surfaces.

Crust resistant twisted pair communications cable

A liquid composition which is a precursor to a solid surface material comprises a liquid polymerizable component and two different solid particle distributions with an added polycarboxylic acid or salt retarding or preventing particle settling.

Particle containing solid surface material

The processes and apparatus of the present invention concerns melt spinning high viscosity fluoropolymers into single filaments or multi-filament yarns at high spinning speeds, the melt spinning being carried out at a temperature which is at least 90&#xb0; C. greater than the melting point of the polymer or in the case of perfluoropolymer, at a temperature of at least 450&#xb0; C., and the yarns produced by the process, wherein the filaments can exhibit an orientation at the surface of the filament no greater than at the core of the filament.

High speed melt spinning of fluoropolymer fibers

A ceramic tile shear testing apparatus and method of use. The apparatus includes a frame with a hydraulic cylinder for moving a shearing member extending outwardly of the frame. The apparatus may be placed on a bonding layer on a working surface adjacent a tile to be tested and the hydraulic cylinder actuated to apply a force to the tile in a direction parallel to the working surface sufficient to break the bond holding the tile to the surface. Pressure in the hydraulic cylinder may be measured when the shear occurs as a correlation of the shear strength of the bond.

Growing community of inventors

Newark, DE, United States of America

Robert Thomas Young