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5116549 |
Solution flow splitting for improved sheet uniformity
A method for splitting the flow of a spin solution in a standard flash spinning process to increase sheet uniformity at increased flow rates. In one embodiment, the apparatus comprises a coarse...
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5106563 |
Process for producing highly oriented molded article of ultra-high-molecular-weight polyethylene
A pre-oriented molded article of ultrahigh-molecular-weight polyethylene is composed of ultrahigh-molecular-weight polyethylene having an intrinsic viscosity of at least 5 dl/g, has a degree of...
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5102601 |
Process for fabricating novel compostes based on reinforcement with microfibrillar networks of rigid-rod polymers
A process for fabricating a composite in the form of a network of microfibrils which includes interpenetrating the microfibrils with a matrix material to form a composite which includes two...
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5098452 |
Method for controlling the level of solvent vapor in a vessel
A method is disclosed for controlling the interfacial level of solvent vapor and overhead gas in a vessel. The solvent vapor level is controlled by means of a displacement body which is suspended...
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5093063 |
Method of producing polyvinyl alcohol fibers
A high tenacity, high initial modulus polyvinyl alcohol fiber is produced by: (1) dissolving polyvinyl alcohol with a degree of polymerization of not less than 1,500 in a solvent capable of...
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5093060 |
Coupled spinning and dewatering process
A continuous process for the manufacture of a fibrous material from a polyolefin. The process comprises feeding a solution of polyolefin dissolved in an organic solvent at elevated temperature and...
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5089187 |
Process for producing a semi-permeable membrane by extrusion
A process for the production of a porous organic material, in particular a semi-permeable membrane, comprising a plurality of separate passageways, including dissolving a polymer in a solvent,...
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5075064 |
Method and apparatus for continuously producing resin films and installation therefor
For continuous production of a resin film having a plain surface, a resin solution cast in film form over an endless belt is pre-hardened by a gas stream supplied for flow in a direction generally...
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5075049 |
Method for improving solvent containment
A method of improving solvent vapor containment in a process for extruding a solvent-polymer mixture into a process vessel operated substantially at atmospheric pressure while continuously removing...
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5071600 |
Preparation of substantially crystalline silicon carbide fibers from polycarbosilane
This invention relates to the preparation of thermally stable, substantially polycrystalline silicon carbide ceramic fibers derived from a polycarbosilane resin. The unexpected thermal stability of...
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5069854 |
Alumina fiber with carbon inclusion and a method of producing the same
An electrically conductive alumina fiber which heretofore known only as electrically insulative is now provided, which comprises an aluminum oxide matrix, and a continuous phase of carbon in the...
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5068073 |
Method of manufacturing polyethylene fibers by high speed spinning of ultra-high-molecular-weight polyethylene
An approximately 1 to 6 wt. % solution manufactured from polyethylene with a molecular weight M w of at least one million and a solvent is extruded into a spinning duct at an extrusion temperature...
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5066755 |
Novel irradiated polyethylene filaments tapes and films and process therefor
Novel gel-spun, irradiated and drawn ultra high strength high molecular weight and at least partially cross-linked and/or branched polyethylene filaments, tapes and films, exhibiting a combination...
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5061426 |
Process for producing elastane fibers of high elasticity and strength
A process for the production of highly elastic elastane fibers (spandex fibers) based on segmented polyurethane (urea) elastomers having high elasticity and, at the same time, high strength values,...
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5061425 |
Solution spinning process for producing a polyethylene terephthalate filament
A process for producing a high modulus, high tenacity polyethylene terephthalate filament which comprises (1) spinning a solution of polyethylene terephthalate in an organic solvent through a die...
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5057260 |
Spinning of segmented polyurethane-urea elastomers in a steam atmosphere
An improved dry spinning process for the production of polyurethane elastomer threads using superheated steam as the spinning medium, comprising (1) spinning polyurethane-urea elastomers...
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5045258 |
Process for the preparation of thermoplastic fibers
A process for the preparation of thermoplastic fibers which comprises: (a) spinning a solution of an alternating copolymer of an olefinically unsaturated compound and carbon monoxide, having a...
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5045248 |
Process for making a non-woven sheet
A process to detect the loss of a continuous spun web of plexifilament fibers exiting a forwarding apparatus depends on the manner in which the filament oscillate in a cross machine direction prior...
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5043112 |
Process for forming articles comprising poly(phenylene sulfide) (PPS)
The present invention pertains to a process for the production of an article comprising a polymer itself comprising poly(phenylene sulfide), which process comprises: A. contacting poly(phenylene...
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5043109 |
Process for flash-spinning dry polymeric plexifilamentary film-fibril strands
An improved process for flash-spinning plexifilamentary film-fibril strands from fiber-forming polyolefins is provided. A polyolefin is mixed to form a solution of 18 to 33 percent polyolefin by...
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5043108 |
Process for preparing polyethylene plexifilamentary film-fibril strands
An improved process for flash-spinning polyethylene plexifilamentary film-fibril strands is provided. The strand is flash-spun from a non-chlorofluorocarbon mixture of polyethylene, an organic...
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5039460 |
Mixed halocarbon for flash-spinning polyethylene plexifilaments
An improved process is provided for flash-spinning plexifilamentary film-fibril strands of polyethylene. A portion of the conventionally used trichlorofluoromethane ("F-11") is replaced with at...
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5032338 |
Method to prepare high strength ultrahigh molecular weight polyolefin articles by dissolving particles and shaping the solution
A method to prepare high strength high modulus polyolefin shaped articles comprising forming a heated solution of the polyolefin from particles of which about 75 to 100% by weight have a particle...
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5023035 |
Cyclic tensioning of never-dried yarns
A process is disclosed for preparing high tenacity, high modulus, para-aramid fibers by application of cyclic tensioning forces to such fibers in the newly-spun, wet, state before they have been...
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5011643 |
Process for making oriented, shaped articles of para-aramid/thermally-consolidatable polymer blends
A process for making oriented, shaped articles of para-aramid/thermally-consolidatable polymer blends by orienting spinnable dopes containing 10 to 25% by weight fiber-forming polymers being at...
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5011644 |
Process for producing gel fiber
A process for producing a gel fiber comprises a step (N) of spinning a solution containing at least one polymer having at least one monomer unit as a constituent component for a gel to solidify the...
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5002474 |
Spinneret for dry spinning spandex yarns
An improved spinneret for use in dry spinning spandex filaments has coaxial inner and outer rings of grouped orifices. The number of grouped orifices in each ring is equal. Each group of orifices...
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5000899 |
Spandex fiber with copolymer soft segment
A elastic fibers are formed from spandex polymer that is prepared by reacting a glycol prepared from a tetrahydrofuran/3-methyltetrahydrofuran copolymer with a diisocyanate and then chain extending...
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5000898 |
Process for making oriented, shaped articles of lyotropic polysaccharide/thermally-consolidatable polymer blends
A process for making oriented, shaped articles of lyotropic polysaccharide/thermally-consolidatable polymer blends by orienting spinnable dopes containing fiber-forming polymers being at least...
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4997714 |
Absorbent products and their manufacture
Film or fibre is made from a polymer of water soluble ethylenically unsaturated monomeric material that includes ionic monomer by extrusion and stretching, and a counterionic lubricant compound is...
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4997601 |
Process for dry spinning thermally sensitive organosilicon preceramic fibers with production of ceramic fibers therefrom
Preceramic fibers are produced by dissolving a solid organosilicon preceramic polymer in a solvent to form a spinning solution containing at least seventy percent polymer solids, dry spinning and...
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4996011 |
Production of polyethylene materials having improved strength and modulus qualities
A process for producing polyethylene materials in which ultrahigh molecular polyethylene is molded by compression, extrusion or rolling and stretching in a solid phase and at specified...
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4985193 |
Aramid yarn process
A process for preparing high modulus, high tenacity fibers of aromatic polyamide wherein a first constant tension within 40-95% of the fiber breaking load is applied to washed fibers at a...
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4975228 |
Process for preparing membranes from tetrahalobisphenol polycarbonates
A process for the preparation of a membrane comprising bisphenol-based polycabonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated wherein the halogen is Cl or...
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4975315 |
Metallizable multi-ply film
A metallizable, sealable, biaxially stretch-oriented multi-ply film comprises a base layer essentially of polypropylene, a first polyolefinic facing layer and a second polyolefinic facing layer....
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4968238 |
Apparatus for making a non-woven sheet
A device to detect the loss of a continuous spun web of plexifilament fibers exiting a forwarding apparatus depends on the manner in which the filaments oscillate in a cross machine direction prior...
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4963310 |
Process for production of polyester polyurethane elastomeric fibers
A process for the production of polyester polyurethane elastomeric fibers having improved humid aging resistance which comprises the steps of reacting a polyester diol with an excess molar amount...
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4963299 |
Surface treatment of polyolefin objects
The invention relates to a process for the treatment of surfaces of highly oriented polyolefin objects, obtained by converting a solution or melt of a linear polyolefin with a weight average...
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4954605 |
Aromatic polyetherketone fiber product
Filaments are produced from polymers having an inherent viscosity of at least 0.7 measured in concentrated sulfuric acid and containing in the polymer chain at least 50 percent of the repeating...
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4952453 |
Acrylic fibers with high physical properties
Acrylic fibers with high physical properties particularly suitable as material for cement reinforcement are provided by spinning a spinning solution of an acrylonitrile polymer at a particular...
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4938911 |
Process for preparing polyolefin gel articles as well as for preparing herefrom articles having a high tensile strength and modulus
A process is described for the preparation of highly stretchable high-molecular weight polyolefin gel articles and polyolefin gel articles prepared therefrom having combined high tensile strength...
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4915893 |
Method of preparing polyester filament material
Method of preparing a new synthetic surgical filament material by spinning a mixture of a polyester and an additive.
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4871494 |
Process for forming asymmetric gas separation membranes having graded density skins
A process for forming high free volume, asymmetric gas separation membranes having graded density skins and macrovoid-free morphology from a solvent system comprising a Lewis acid, Lewis base, and...
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4869861 |
Process for producing a shaped and drawn aromatic imide polymer article
A shaped and drawn aromatic imide polymer article, for example, a film or filament, is produced by shaping an aromatic polyamic acid solution containing an imidizing agent in a polar organic...
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4869858 |
Processes for producing polysiloxazanes and silicon oxynitride fibers
Novel polysiloxazanes comprising [(SiH 2 ) n NH] and [(SiH 2 ) m O] as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with...
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4861539 |
Process of making water-absorbent, water-insoluble, cross linked fiber or film
Water absorbent, water insoluble, cross linked polymer fibre or film can be made by dry extrusion of a solution of a substantially linear polymer formed from a water soluble blend of...
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4859393 |
Method of preparing poly (p-phenyleneterephthalamide) yarns of improved fatigue resistance
Poly(p-phenyleneterephthalamide) yarn of improved fatigue resistance is prepared by spinning the polymer in sulfuric acid through an air gap into an aqueous coagulating bath to produce a coagulated...
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4849148 |
Process of making an aromatic polyetherketone fiber product
Filaments are produced from polymers having an inherent viscosity of at least 0.7 measured in concentrated sulfuric acid and containing in the polmer chain at least 50 percent of the repeating...
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4842793 |
Process for wetting thread bundles with liquids
Thread bundles which are transported from top to bottom, can be wetted with liquids by means of a device consisting of a system releasing the liquid, conduits and a storage container as well as...
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4839112 |
Methods for fabricating a low dimensionally electroconductive article
Methods for fabricating low dimensionally electroconductive articles comprising cofacially stacking organomacrocycles and as cofacially stacking phthalocyanines, in which a composition comprising a...
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