Abstract: An aromatic polyamide filament includes extremely fine inorganic material having a high refractive index of 2.0 or more and an extremely fine average particle size of 0.3 .mu.m or less and dispersed, in an amount of 0.1 to 5% based on the total weight of the filament, in at least a surface portion of an aromatic polyamide filament matrix; has an individual filament thickness of 0.5 to 50 deniers, a tensile strength of 18 g/d or more, an ultimate elongation of 3.5% or more and an initial modulus of 450 g/d; and exhibits an enhanced weathering resistance derived from the high ultraviolet ray-reflecting, shielding and absorbing properties of the extremely fine inorganic particles dispersed in the filament matrix.

Abstract: A polyamide fiber excellent in strength, which is characterized by being made of a polyamide having a relative viscosity of not less than 3.5 (measured on a 96% by weight sulfuric acid solution having a polyamide concentration of 10 mg/ml at 20.degree. C.), showing an index of birefringence (.DELTA.n) of not less than 50.times.10.sup.-3 and having the following relationship between the break strength and the break elongation:Break strength (g/d).times.(Break elongation (%)).sup.1/2 .gtoreq.46.0, the index of birefringence in the section of fiber satisfying the following relationship:.DELTA.n.sub.A -.DELTA.n.sub.B .gtoreq.0.5.times.10.sup.-3(wherein .DELTA.n.sub.A is the index of birefringence of fiber at the position of r/R=0.9, .DELTA.n.sub.B is the index of birefringence of fiber at the position of r/R=0.0, R is the radius of the section of fiber and r is the distance from the central axis of the section of fiber).

Abstract: Porous flame retarded acrylic synthetic fibers consisting of cellulose acetate and a modacrylic copolymer containing vinyl chloride and/or vinylidene chloride are produced by spinning an organic solvent solution of a polymer consisting of cellulose acetate and the above described modacrylic copolymer into a coagulation bath, primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0, drying the water swelled fibers at 100.degree..about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat at a draw ratio of no greater than 3 times.

Abstract: The present invention relates to an improved process for forming elastomeric fibers for elastic yarn from neutralized sulfonated elastomeric polymers, and novel elastomeric fiber compositions derived therefrom, wherein the neutralized sulfonated elastomeric polymer is dissolved in a mixed solvent consisting of a backbone solvent and a polar cosolvent and spun into fibers. The neutralized sulfonated elastomeric polymer has about 10 to about 50 meq. sulfonate groups per 100 grams of sulfonated elastomeric polymer, of which at least 95% are neutralized with a cation being selected from the group consisting of antimony, iron, lead, aluminum, and Groups I-A, II-A, IB and II-B of the Periodic Table of Elements and mixtures thereof. The solution of the neutralized sulfonated elastomeric polymer having a Brookfield viscosity at room temperature at about 6 rpm of about 1,000 to about 200,000 cps is fabricated into fibers by wet or dry spinning through a spinner having a plurality of orifices therein.

Abstract: An acrylic fiber having improved basic dyeability and the method for making the same wherein an acrylic polymer containing a sulfonated vinyl monomer as a part thereof is dissolved in a suitable solvent to form a spinning dope and a solution of a second or additive polymer dissolved in the same solvent is added to the dope which is then spun to form fibers. The second polymer is selected from the group consisting of cellulose triacetate, polymethyl methacrylate, polyvinyl chloride, a polyamide of hexamethylenediamine with 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl) indane and a polyamide of hexamethylene diamine with isophthalic acid. The spin dope will contain 10 to 35 weight percent of polymer solids, with the amount of the second or additive polymer being 0.5 to 25 weight percent of the total polymer solids. Fibers spun from the dope have enhanced basic dyeability. The method is effective only when the acrylic polymer contains a sulfonated vinyl monomer as part of the acrylic polymer backbone.

Abstract: Disclosed is an acrylic fiber having improved basic dyeability. The fiber is made by a process wherein a copolymer of an acrylic monomer and a sulfonated vinyl monomer is dissolved in a solvent to form a spinning dope and a solution of polystyrene in the same solvent is added to the dope prior to spinning the dope to form fibers. The polystyrene will be in the form of a separate phase dispersed throughout the spinning dope and the fibers formed from the dope. Fibers formed from this polystyrene-containing dope have improved basic dyeability.

Abstract: A method for interacting Prussian blue with polyacrylonitrile in the presence of dimethylformamide to produce a polymer solid exhibiting a high degree of color fastness, levelness, and stability and having enhanced and highly useful electrical properties.

Abstract: Hollow fiber membranes of copolymers of ethylene with 5 to 20 weight percent of copolymerizable vinyl monomers display much superior permeabilities to organic compounds than do polyethylene hollow fibers, less loss of permeability upon storage or use and good strength. Use of such new hollow fiber membranes affords an improved process for the separation of phenols from aqueous solutions thereof through permeation.

Abstract: Carbon fiber-polyetherimide matrix composites are provided, based on the use of polyetherimide having terminal nitro groups. The carbon fiber-polyetherimide composites have high strength, high modulus and superior solvent resistance.

Abstract: Sulfone polymers are disclosed containing bibenzyl sulfone repeating units having the formula ##STR1## These polymers exhibit good mechanical properties, toughness, flexiblity, thermal and chemical stability and can be heat processed, extruded, drawn or otherwise formed into shaped articles having a high degree of strength and good dielectric properties.

Abstract: A method for obtaining delustered polyacrylonitrile fibers, wherein fibers are formed from a spinning solution, that is, being a mixture of two copolymer solutions, one of them being polyacrylonitrile and the other a ter grafted copolymer of acrylonitrile and styrene on rubber such as butadiene or butadiene-styrene rubber-ABS-copolymer.