E.i. Dupont De Nemours and Company

Other

William Cheng Uy

Edward William Tokarsky

Martin Gerald Wagner

Glenn William Heffner

William M Sanford

Robert Thomas Young

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

The processes and apparatus of the present invention concerns melt spinning high viscosity fluoropolymers into single filaments or multi-filament yams at high spinning speeds, the melt spinning being carried out at a temperature which is at least 90&deg; C. greater than the melting point of the polymer or in the case of perfluoropolymer, at a temperature of at least 450&deg; C., and the yams 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.

The present invention relates to melt spun fibers prepared from blends of poly(tetrafluoroethylene) and poly(tetrafluoroethylene-co-perfluoro-alkylvinyl ether).

Melt spun fibers from blends of poly(tetrafluoroethylene) and poly(tetrafluoroethylene-co-perfluoro-alkylvinyl ether)

This invention pertains to melt spun fibers of copolymers formed from tetra-fluoro ethylene and perfluorovinyl monomers and a process for their formation. In the process of this invention fibers exhibiting high strength and low shrinkage are drawn from the melt at SSFs of at least 500&times;.

Melt spun fluoropolymeric fibers and process for producing them

This invention pertains to melt spun fibers of copolymers formed from tetra-fluoro ethylene and perfluorovinyl monomers and a process for their formation. In the process of this invention fibers exhibiting high strength and low shrinkage are drawn from the melt at SSFs of at least 500.times..

The disclosed invention relates to a process wherein zein fibers are prepared by contacting zein with a volatile solvent system and dry spinning into a gaseous atmosphere. This process obviates the need for environmentally unfriendly alkaline solutions and acid coagulating baths.

Dry spinning process for producing zein fibers

An improved spatter shielding and vapor venting device for a frying pan comprising a transparent lid to enable visual observation of cooking, a peripheral venting gap to release generated fumes and vapors, a vertical hollow cylindrical wall to rapidly return condensed oil to frying pan, a handle to hold the device steady, a peripheral horizontal flange and size expansion adapter to facilitate placement on rims of frying pans of varying sizes, a vertical cylindrical flange to restrict lateral motion and to shield the contact area between the horizontal flange and frying pan rim, a vertical window opening for the introduction, removal, stirring and turning over of food, a hands-free opening and automatic closing window cover means to effectively shield the window opening even while performing said cooking operations, a loop-and-pin hinged system to facilitate stuck-proof withdrawal of inserted instrument through said window opening.

Spatter shielding and vapor venting device for frying pan

The disclosed invention relates to a process wherein zein fibers are prepared by mixing zein and water, preferably btween 0.degree. C. and 18.degree. C., to form a free-flowing, particulate mixture; heating the mixture to a temperature of about 45.degree. C. to about 80.degree. C. while simultaneously extruding the mixture through a spinneret to form zein fibers which are subsequently treated with a formaldehyde stabilizing solution and drawn. This process obviates the need for environmentally unfriendly alkaline solutions and acid coagulating baths.

Process for producing zein fibers

A spatter shielding and vapor venting device for a frying pan comprising a transparent lid to enable visual observation of cooking, a peripheral venting gap to release generated fumes and vapors, a vertical hollow cylindrical wall to rapidly return condensed oil to frying pan, a handle to hold the device steady, a horizontal flange to facilitate placement on rims of frying pans of varying sizes, a vertical cylindrical flange to restrict lateral motion and to shield the contact area between the horizontal flange and frying pan rim, a vertical window opening for the introduction, removal, stirring and turning over of food, a hands-free opening and automatic closing window cover means to effectively shield the window opening even while performing said cooking operations.

Polymeric composite materials having a decreasing concentration gradient of polymer matrix from the material's surface to the material's interior and a process for making such materials, whereby polymer matrix is extracted from the interior of the material in such a manner that the matrix concentration at the material's surface increases.

Composites having improved surface properties

This invention relates to novel processes for preparing polypeptide solutions and spinning them into fibers. The process involves dissolving a polypeptide in a solvent system comprising lithium thiocyanate (LiSCN) and a liquefied phenol selected from the group consisting of phenol, m-chlorophenol, m-fluorophenol, and m-bromophenol or mixtures thereof. The solutions may be spun using certain wet spinning and dry-jet wet spinning methods. The process is especially useful for making silk fibroin fibers.

Process for spinning polypeptide fibers from solutions of lithium

Polymeric composite materials having a decreasing concentration gradient of polymer matrix from the material's surface to the material's interior. The composite is produced by a process whereby polymer matrix is extracted from the interior of the material in such a manner that the matrix concentration at the material's surface increases.

Method of making composites having improved surface properties

As-spun fibers from certain spinnable dopes of poly-p-phenylenebenzobisthiazole, poly-p-phenylenebenzobisoxazole, or poly-2,5-benzoxazole and thermoplastic polymers in certain mixed solvents are provided.

Spinnable dopes and articles therefrom

Fibrids of poly-p-phenylenebenzobisthiazole, poly-p-phenylenebenzobisoxazole, or poly-2,5-benzoxazole and thermoplastic polymers in certain mixed solvents are provided.

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Hockessin, DE, United States of America

William Cheng Uy