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4094945 |
Spinning of polypyrrolidone
Polypyrrolidone solutions having a bulk viscosity of 100-10,000 poises, and containing a solvent such as formic acid and a volatile diluent such as methylene chloride, are spun into filaments by...
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4075269 |
Process for producing wholly aromatic polyamide fibers of high strength
An improved process for preparing wholly aromatic polyamide fibers of high performance charcteristics is provided. The process includes the steps of providing a spinning solution of a wholly...
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4054625 |
Process for making fibers
A process of manufacturing fibers by forming a mixture of a solvent, a polymer and water and flashing the mixture through a nozzle. Water is present as a discontinuous phase in the mixture. The...
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4010229 |
Process for the manufacture of short fibrils
A process is provided for the manufacture of fibrils of short length by suddenly releasing the pressure acting on a two-phase liquid mixture of molten polymer and solvent and which is at a high...
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4007247 |
Production of fibrils
Fibrils of thermoplastic polymer, particularly crystalline thermoplastic polymers such as polyethylene and polypropylene, are prepared by forcing a dispersion of heat softened polymer particles in...
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3997648 |
Fibril formation process
An improvement in the fibril formation process which includes dissolving at an elevated temperature an olefin polymer having an inherent viscosity of at least 3.5 in a hot hydrocarbon solvent,...
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3991014 |
Polyesters of derivatives of hydroquinone and bis(carboxyphenyl)ether
This invention relates to a class of novel polyesters derived from derivatives of hydroquinone and bis(carboxyphenyl)ether and to the fibers and other shaped articles prepared therefrom. Also...
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3988411 |
Spinning and shaping poly-(N-acetyl-D-glucosamine)
Poly(N-acetyl-D-glucosamine) is soluble in hexafluoroisopropyl alcohol and hexafluoracetone sesquihydrate. The solutions formed may be wet or dry spun into filaments, or cast into films or solid...
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3983095 |
Absorbent fibers and process for their preparation
Water-insoluble, water-swellable fibers adapted to bind aqueous fluids such as body exudates are prepared by spinning fibers from an organic solvent solution of a copolymer of maleic anhydride with...
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3976631 |
Process for preparing ethylene polymers
In a process for preparing homo- or co-polymer of ethylene, in which ethylene alone or mixed with one or more other unsaturated organic compounds capable of forming a copolymer with ethylene is...
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3961009 |
Process for the production of a shaped article of a heat resistant polymer
A process is provided for manufacturing heat resistant polymeric film. A concentrated polymer composition containing solvent is provided, which composition is a solid at room temperature. The...
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3954721 |
Absorbent fibers and process for their preparation
Water-insoluble, water-swellable fibers adapted to bind aqueous fluids such as body exudates are prepared by spinning fibers from an organic solvent solution of a copolymer of maleic anhydride with...
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3950478 |
Process for producing alumina fiber
Alumina fibre is prepared by spinning a solution containing an aluminium compound and an organic polymer, removing solvent and contacting the fibre with ammonia or an amine before conversion of the...
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3941865 |
Extrusion of ethylene oxide resins
The facile extrusion of ethylene oxide resins has been effected by employing water as an extrusion aid.
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3940469 |
Process for forming hollow fibers
Hollow membrane fibers are formed from a mixture of N-alkoxyalkyl polyamide, polyvinyl alcohol, di(lower alkyl) sulfoxide and water. The fibers are useful for separating chemicals, e.g.,...
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3929691 |
Solutions of copolymers containing amide and imide groups and process for their preparation
The invention provides wet- or dry-spinnable solutions of high molecular weight polyamide-polyimide copolymers derived from an aromatic diisocyanate, an aromatic or heterocyclic diacid, an aromatic...
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3928516 |
Continuous method for making spinnable polyacetylene solutions convertible to high strength carbon fiber
A continuous method is provided for making polyacetylene fiber convertible to high strength carbonaceous products. A thin film evaporator is employed to devolatilize the reaction mixture at the...
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3914354 |
Process for producing fine fibrous structures
An aqueous disperse system, preferably an aqueous emulsion, comprising a molten linear polymer droplets dispersed in the aqueous phase and containing a fine water-sorption agent and a positive...
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3891499 |
Synthetic papermaking pulp and process of manufacture
A pulp of synthetic polymer fibers useful for papermaking. The fibers have the appearance of rolled or folded sheets at a magnification of about 500X and are distinct from one another, being only...
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3888965 |
Method of increasing the initial modulus and reducing the orientation angle of undrawn poly (para-benzamide) fibers
High molecular weight polymers consisting essentially of recurring units of the formula ##SPC1## Are useful for the production of fibers having a high initial modulus. The initial modulus is...
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3885014 |
Production of fine fiber mass
Water and a linear polymer in the molten state are kneaded in a high-pressure region to disperse the water minutely and uniformly throughout the polymer, which is then extruded together with...
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3883467 |
Solutions of tetrachlorinated aromatic polyesters in methylene chloride
A stable solution adapted to form filaments by dry-spinning and a dry-spinning process utilizing such a stable solution are disclosed. The stable solution contains from about 70 to about 82 percent...
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3882095 |
PROCESS FOR FORMING POLYOLEFIN FIBERS
The process of forming polyolefin fibers comprising polymerizing an olefin in a solvent or dissolving a high molecular weight polyolefin in the solvent at a temperature above the melt dissolution...
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3879519 |
Flash extrusion process
A flash-extrusion process for preparing plexifilamentary structures of PACM-12 employs a mixed solvent consisting essentially of hexafluoroisopropanol and dichlorofluoromethane.
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3879506 |
PROCESS FOR PRODUCING CHLORO-VINYL FIBERS HAVING MODIFIED LIGHT REFLECTION
Textile fibers composed of vinyl chloride homopolymers or of copolymers containing at least 80% by weight of vinyl chloride or mixtures thereof having an appearance (sheen) and a feel similar to...
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3878284 |
Processes for making shaped articles such as filaments or films from solutions of polyglycolic acid
This invention relates to a process for making shaped articles from certain solutions of polyglycolic acid using hexafluoroisopropyl alcohol or hexafluoroacetone sesquihydrate as solvents. The...
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3864448 |
Dry-spinning tetrachlorinated armoatic polyester filaments from methylene chloride solutions
A stable solution adapted to form filaments by dry-spinning and a dry-spinning process utilizing such a stable solution are disclosed. The stable solution contains from about 70 to about 82 percent...
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3846386 |
CROSS-LINKED COPOLYMER ACRYLONITRILE FIBERS OR FILMS
Cross-linked acrylic fibers or films which are of improved hot water-resistance and have a silky hand or feel, are obtained by (i) preparing an acidic solution of a copolymer obtained by...
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3772136 |
FIBROUS PRODUCTS FROM THERMOPLASTIC POLYAMIDE POLYMERS
An air pervious, water repellent, self-supporting fibrous mat is produced by spraying a mixture of polyamide polymer and a suitable, rapidly evaporating compatible solvent. The fibrous mats are...
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3760054 |
PROCESS FOR PREPARING POROUS AROMATIC POLYAMIDE FIBERS
Porous fibers of an aromatic polyamide in which the void volume for pores having pore diameters of 0.12 micron or less is greater than 0.03 cc./gm., and the void volume for pores having pore...
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3756441 |
FLASH SPINNING PROCESS
Process for preparing high quality plexifilaments from isotactic polypropylene by flash extruding trichlorofluoromethane solutions at temperatures from 200° to 240°C. and pressures in excess of...
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3743272 |
PROCESS OF FORMING POLYOLEFIN FIBERS
The process of forming polyolefin fibers comprising forming a solution of a linear, high molecular weight polyolefin in a solvent at a temperature above the melt dissolution temperature of the...
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3717696 |
PROCESS FOR THE PREPARATION OF POLYAMIDE-IMIDE FILAMENTS
This invention provides a process for producing polyamide-imide filaments which are heat-stable and have high tensile strength by solvent spinning under specified conditions. In a preferred...
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3696181 |
FLASH EXTURSION OF POLYVINYL CHLORIDE
A flexible, low density foam of polyvinyl chloride having closed polyhedral-shaped cells and very thin cell walls of uniform thickness is produced by flash extruding a solution of the polymer in a...
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3681488 |
A MELT EXTRUDING PROCESS COMPRISING A TRIOXANE MONOMER AND A POLYMERIC BINDER
A filament and film forming process in which a monomer stream comprising at least 50 percent trioxane and a polymeric binder of either polyvinylacetate or polyacetaldehyde is melt extruded;...
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3681472 |
SHAPED STRUCTURES
This application discloses a process of preparing a self-supporting shaped structure which comprises polymerizing a solid phase monomer in the presence of a fluid catalyst. Specifically, trioxane...
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3671653 |
GAS PURGING OF SPINNING PACKS
A process for improving the percentage of successful startups in spinning polymer from solution is provided. Startups are often hindered by the presence of air in the spinneret assembly. The...
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3669934 |
IMPROVED ELASTOMERIC FIBERS
Improved elastomeric fibers are disclosed and claimed which are comprised of alternating hard and soft segments, i.e., polyesterurethane copolymers, wherein the fibers are improved in properties,...
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3666728 |
POLYTHIOUREAS AND SHAPED ARTICLES THEREOF
Homo- and co-polythioureas having recurring units of the formula: ##SPC1## Wherein R is hydrogen or methyl, are useful in the preparation of shaped articles (particularly fibers).
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3655498 |
PLEXIFILAMENTARY STRUCTURES PREPARED FROM NON-CRYSTALLINE SYNTHETIC ORGANIC POLYMERS
Plexifilamentary structures prepared by flash-spinning solutions of non-crystalline synthetic organic polymers. The structures show no long-period diffraction when subjected to small-angle X-ray...
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3626049 |
PROCESS FOR PRODUCING CROSS-LINKED ACRYLIC FIBERS OR FILMS
Cross-linked acrylic fibers or films which are of improved hot water-resistance and have a silky hand or feel, are obtained by (i) preparing an acidic solution of a copolymer obtained by...
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3608041 |
SPINNING PROCESS
A method of spinning fiber-forming material comprising forming three frustoconical portions, each having an apex angle larger than the foregoing section, and including a cylindrical portion...
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3602291 |
APPARATUS FOR CASTING METAL FILAMENTS THROUGH AN AEROSOL ATMOSPHERE
Metallic filaments are produced by quenching a stream of molten metal extruded from a melt with an aerosol such as a suspension of finely divided fluid particles in air. The aerosol is produced by...
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3542715 |
FOAMED STRAND OF AN ORGANIC POLYMERIC MATERIAL
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3536668 |
PROCESS FOR THE PRODUCTION OF POLYURETHANE FIBERS
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3536803 |
PROCESS FOR TREATING ELASTOMERIC FIBERS
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3536651 |
AROMATIC POLYHYDRAZIDE SOLUTIONS AND ARTICLES
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3536219 |
PROCESS FOR PREPARING HIGH TENACITY POLYOXYMETHYLONE FIBERS
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3535415 |
PRODUCTION OF CROSS-LINKED ELASTOMERIC YARNS BY DRY SPINNING
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3528937 |
AQUEOUS SOLUTIONS OF POLYAMIDE ACIDS
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