Abstract: A carbon-carbon part is provided comprising a composite substrate having a plurality of discontinuous filamentized fibers and a binder that binds said filaments together to form a composite substrate, and a plurality of carbon atoms deposited onto the filaments at a predetermined temperature so that the binder is removed completely from said filaments and replaced by said carbon atoms to form a dense carbon-carbon part. A method for producing the dense carbon-carbon part is also provided.

Abstract: A novel pleated fibrous structure is disclosed, which fibrous structure comprises a layer of a pleated split fiber film. The layer of split fiber film may be electrostatically charged. The pleated split fiber film may be part of a composite fibrous structure further comprising a support of a nonwoven or scrim.

Abstract: Multicomponent fibers have a primary core, and multiple secondary cores equidistantly radially spaced from one another and from the primary core. The primary and secondary cores are entirely embedded within (and thus completely encased by) a primary sheath. Optionally, the primary sheath may be entirely or partly surrounded by a secondary sheath. The primary and secondary cores may be spun from polymers having distinctly different or complementary properties which are surrounded by a sheath or sheaths formed of another polymer(s) which protects the cores.

Abstract: A non-woven fabric comprising thermally fusible composite fibers with shortened heat-sealing time and improved heat-sealing strength is provided. The non-woven fabric is produced using side-by-side type or sheath-and-core type thermally fusible composite fibers comprising a first component consisting of polyethylene and a second component consisting of polyester, said polyethylene occupying continuously at least a portion of the surface of the fiber in the length direction, wherein said polyethylene is a copolymer having 1.6/1,000 C or more methyl branches in its molecular chains, a density from 0.940 to 0.965 g/cm.sup.3, and a Q value (weight average molecular weight Mw/number average molecular weight Mn) of 4.8 or less.

Abstract: A biocompatible porous hollow fiber made of a polyolefine material and having a coating of biocompatible carbon material herein said coating is obtainable by a process comprising the following steps:introducing a preformed porous hollow fiber into an atmosphere of gaseous monomer vinylidene chloride (1,1 di-chloroethylene);inducing a graft-polymerization reaction and grafting a uniform layer of polyvinylidene chloride on the polyolefine material forming said porous hollow fiber; andsubstantially eliminating and removing hydrogene chloride (dehydrochlorination reaction) from said polyvinylidene chloride in order to convert said polyvinylidene chloride layer into a coating of biocompatible carbon material.Preferably said graft-polymerization reaction may be induced by means of an ionizing radiation, especially by means of a gamma radiation. Preferably said substantial removal of hydrogene chloride may be performed by treating the coated hollow fiber with a hot concentrated aqueous ammonia solution.

Abstract: A tobacco smoke filter material comprises a fibrillated cellulose ester fiber with an average fiber diameter of 15 to 250 .mu.m and a BET specific surface area of 0.5 to 4.5 m.sup.2 /g. The fibrous cellulose ester content of the material may for example be not less than 20 weight %. The cellulose ester fiber is provided by, for example, extruding a cellulose ester solution from a nozzle into a precipitating agent for the particular cellulose ester and subjecting the extrudate to a shear force. This filter material can be used in the form of, for example, a filament, web or sheet to provide a tobacco smoke filter which assures good smoking qualities and excellent wet disintegratability.

Abstract: Proposed is an electret fiber which is a rayon fiber containing 0.05 to 2.0% by weight of tourmaline particles having a particle diameter not exceeding 0.3 .mu.m. The electret fiber is effective for invigoration of human body by promoting blood circulation. The electret fiber is prepared by spinning a spinning solution of rayon containing the tourmaline particles uniformly dispersed therein into the form of a fiber.

Abstract: A fluororesin composition is disclosed which includes vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene copolymerized in a specific proportional ratio and a multifunctional monomer as an auxiliary cross-linking agent. The composition may optionally include an organic phosphite or a light stabilizer in a predetermined proportion. A heat-shrinkable tubing made from the fluororesin composition and an insulated wire incorporating an insulation layer or an insulating coating comprised of the fluororesin composition are further disclosed.

Abstract: A flexible, ignition resistant, biregional fiber is disclosed, wherein the fiber is preferably derived from a single homogeneous polymeric precursor composition, said biregional fiber comprising an inner core region of a thermoplastic polymeric composition and a surrounding outer sheath region of a thermoset carbonaceous material. The biregional fiber is particularly characterized by having a ratio of the radius of the core region with respect to the total radius of the fiber (r:R) of from about 1:4 to about 1:1.05, an LOI value of greater than 40, a breaking twist angle of from 4 to 13 degrees, and a bending strain value of from greater than 0.01 to less than 50%.

Abstract: Highly elastic heat-bonding conjugated fibers capable of providing a fiber structure having excellent recovery from compression and compression durability and a high level of air permeability comprise a thermoplastic elastomer component and a crystalline nonelastic polyester component having a higher melting point than that of the elastomer as constituent components thereof and can be provided by arranging the elastomer component in a crescent shape in the circular fiber cross section of the bonding conjugated fibers and specifying the geometrical dimensions (a shape occupied by each of the two components constituting the heat-bonding conjugated fibers) therein.

Abstract: The invention is directed to a cellulose filament yarn having a breaking tenacity of higher than 600 mN/tex and containing more than 400 filaments and a cord made therefrom.

Abstract: This invention relates to a method for disentangling hollow carbon microfibers and to the dispersion of hollow carbon microfibers, preferably having an outer diameter of 3.5 to 70 nm and an aspect ratio of at least 5, to form transparent electrically conductive films. Hollow carbon microfibers, treated with strong acids such as sulfuric acid or oleum and an oxidizing agent such as nitric acid, are disentangled and dispersed homogeneously in a polar solvent. The slurry in which the microfibers are suspended can be coated on a substrate. The coating film is dried and a transparent electrically conductive film is formed. A carbon microfiber aggregation film with excellent transparency is obtained having a total transmittance of at least 80 percent and a haze value of at most 0.1%.

Abstract: Fabrics containing melamine fibers are rendered more comfortable by carding the melamine fibers under vacuum so as to exhibit a narrower fiber diameter distribution (.delta..sub.d) and/or a narrower staple length distribution (.delta..sub.1) as compared to melamine fibers which are carded in the absence of vacuum. In addition, more comfortable melamine fiber-containing yarns are produced by spinning the staple fiber at a lower twist multiplier (TM) as compared to conventional melamine fiber yarns. Most preferably, the melamine fiber-containing fabrics and yarns will be blended with at least one other type of synthetic fibers, such as aramid fibers.

Abstract: The present invention relates to an elastic fiber of polyester elastomer mainly comprising the polyester elastomer further comprising aromatic polyester component as a hard segment and poly(alkyleneoxide)glycol having a number-average molecular weight of 500 to 5000 as a soft segment, wherein a residual elongation after 400 percent stretching does not exceed 100 percent. Made of the polyester elastomer comprising 1,2-bis?4-(2-hydroxyethyl)phenoxy!ethane as the diol component constituting said aromatic polyester component, or 1,4-benzenediethanol and ethyleneglycol as the diol component constituting said aromatic polyester component, the elastic fiber features excellent elastic properties in the event of great deformation and provides suitable material for clothing.

Abstract: A process of preparing new down-like clusters employs a method of point-bonding thermoplastic cut fibers in a stack of webs of carded fibers or continuous filaments in a tow, and then cutting and separating the resulting clusters which have an entirely different structure that is refluffable. Ultrasonic bonding has worked well as the bonding method, but other methods may prove useful.

Abstract: A process for producing a preform for elastic optical fiber having a refractive index distribution in which the refractive index is gradually decreased from the center of the preform toward the outer periphery thereof, by depositing a deposition layer comprising a polymer A (refractive index: N.sub.a) and a refractive index modifier having a refractive index different from that of the polymer A onto an inner surface of a hollow cylindrical member rotating about an axis thereof, by use of vapor-phase deposition based on a CVD (Chemical Vapor Deposition) process, or a coating process. A plastic optical fiber preform comprising deposition layers having a gradually increasing refractive index distribution is formed by changing the mixing ratio between the polymer A and the refractive index modifier constituting the deposition layer.

Abstract: This invention relates to a coextruded monofilament having a sheath made of a first resin and a core made of a second resin which is different than the first resin and which has a higher coefficient of friction than the first resin. The core of the monofilament is exposed at the tip by conventional mechanical end-rounding techniques to form a tip with a higher coefficient of friction than the tip of a typical monofilament.

Abstract: Fabrics made of melamine fibers are made more comfortable by submerging them for at least 20 minutes in a dyebath or mock dyebath that is at least 70.degree. C.

Abstract: Spinning polypropylene at relatively high temperatures with delayed quenching, and drawing at relatively high temperatures with moderate draw ratios, provides fibers having an improved tensile factor, especially improved elongation, and can be used to produce fibers also having a high tenacity. The fibers are particularly useful for reinforcement applications when provided in the form of staple fibers and exhibit a tensile factor TE.sup.0.50 of at least about 60, where T is tenacity (gpd) and E is elongation (percent), especially those having a tenacity of at least about 8 gpd and/or an elongation of at least about 25%, and most especially those having a tenacity of at least about 10 gpd and elongations of 50% to 400%.

Abstract: The present invention provides a new polyamide suture and a process for manufacturing this suture. The suture is made by melt extruding, quenching and drawing a polyamide filament. The polyamide filament is then wound on racks and annealed at a temperature of from about 120.degree. C. to about 185.degree. C. for at least 30 minutes. The sutures produced by this process have improved knot strength, tensile strength and stability.