Abstract: Improved fibers of a copolymer of ethylene terephthalate/hexahydroterephthalate containing a high proportion of hexahydroterephthalate are obtained by a 2-stage drawing process, involving annealing, and crimping, with the annealing being performed within a temperature range of about 140.degree. to about 175.degree. C.

Abstract: A process for producing a porous film comprising polyolefin resin, a filler and an ester of dipentaerythritol having a ratio 3 to 70% residual OH groups.

Abstract: The invention is a crystalline fiber comprising syndiotactic polystyrene, or a mixture. Preferably the fiber is a high strength fiber isotactic polystyrene and syndiotactic polystyrene wherein the fiber is monoaxially oriented, has a tensile strength of about 10,000 psi or greater, and a modulus of about 1,000,000 psi or greater.In another aspect the invention is a process for the preparation of fibers of syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene which comprises:A. contacting syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene with a solvent for the polystyrene at elevated temperatures under conditions such that a homogenous solution is formed which has sufficient viscosity to be extruded;B. extruding the solution through an orifice to form a fiber at elevated temperatures;C. quenching the fiber by passing the fiber through one or more zones under conditions such that the fiber solidifies;D.

Abstract: 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 these fibers is achieved by the incorporation of boron prior to ceramification.

Abstract: Drawn polyester multi-filament yarns, preferably prepared by a coupled process of spin-drawing, and of fabrics and garments thereof, are prepared by an improved process involving treatment of freshly-extruded polyester filaments with caustic in the spin-finish, so as to improve moisture-wicking properties.

Abstract: A process for improving the properties of fibers of a copolymer of ethylene terephthalate/hexahydroterephthlate units with a high proportion of hexahydroterephthalate units by a 2-stage drawing, crimping, relaxing process to provide stretchy filaments of high elongation accompanied by low shrinkage.

Abstract: Polyester crystalline filaments that have been prepared by spin-orientation, and filaments prepared by drawing such filaments without texturing, in yarns thereof, and in fabrics and garments thereof, are prepared by an improved process involving treatment of freshly-extruded polyester filaments with caustic in the spin-finish, so as to improve moisture-wicking properties.

Abstract: Polyester filaments in spin-oriented feed yarns, such as DTFY, and in draw-textured and other drawn yarns therefrom, and in fabrics and garments of such yarns, are prepared by an improved process involving treatment of the freshly-extruded polyester filaments with caustic in the spin-finish, so as to improve moisture-wicking properties.

Abstract: Solid polyester fiber in spun yarns, and fabrics and garments and precursor staple fiber and filamentary tow, are prepared by an improved process involving treatment of freshly-extruded undrawn polyester filaments with caustic in the spin-finish, so as to improve moisture-wicking properties.

Abstract: An approximately 1 to 6 wt. % solution manufactured from polyethylene with a molecular weight M.sub.w of at least one million and a solvent is extruded into a spinning duct at an extrusion temperature T.sub.E =180.degree. to 250.degree. C. at an extrusion rate V.sub.E =5 to 150 m/min. The duct is kept at a temperature of 100.degree. to 250.degree. C. by means of a heating device below the jet outlet area. The fibers are drawn off at a rate V.sub.w of at least 500 m/min, preferably 1500 to 4000 m/min, and freed of the solvent without further stretching. The fibers obtained are especially well suited for manufacturing industrial yarns, protective clothing, bulletproof vests, ropes, and parachutes. In the form of staple fibers, they are suitable for reinforcing various plastics.

Abstract: A method for determining the degree of adherence to a non-flat, opaque vehicle panel surface of a component adhered thereto. The method includes providing an integrally cast clear matched surface in the panel so that the contacting surfaces of the component may be directly viewed.

Abstract: A method for forming a dry web on the wire, with the fibre material being fed into at least one perforated drumlike forming element that covers essentially the whole width of the web to be formed, in which forming element fibres are conveyed in the drum along the width of the web and screened through the mantle of the forming element onto the wire. To achieve such web formation as has as few disturbances as possible, the fibre material is fed into the drumlike forming element in such a way that the bulk of the fibres, when advancing in the feeding direction toward the other end of the forming element, get screened from the forming element onto the wire, and that those fibres that do not get screened, but travel through the forming element are removed from the forming element and returned for a new defibration.

Abstract: Mesophase pitch centrifugally spun over a lip of the centrifugal rotor can be protected from coke and tar formation by conveying the molten pitch to the rotor's lip through channels within the rotor.

Abstract: A continuous spin-draw process of making dimensionally stable polyester fiber having high strength and low shrinkage by melt spinning polyethylene terephthalate and drawing comprising multiple drawing stages of at least two stages where the spun yarn is passed from the takeup roller to a first pair of drawing rollers, then to a final pair of drawing rollers, then to a pair of relaxation rollers and then to yarn take up means; the surface temperature of said final pair of drawing rollers being maintained at 10.degree. to 60.degree. C. lower than the melting point of the drawn fiber; a non-contct type heated plate whose surface temperture is heated to 250.degree. to 500.degree. C. is positioned 20 to 100 mm separated from the yarn, thereby heating the yarn to obtain the relaxation heat treatment; and applying a commingling treatment to the drawn fiber by installing a commingling treatment apparatus between the final pair of drawing rollers and the pair of relaxation rollers.

Abstract: 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 of substantially lower creep rates, very high heat shrink characteristics and high abrasion resistance properties than corresponding but non-irradiated articles, and with a process for making the same.

Abstract: Drawing, especially cold-drawing, or hot-drawing or other heat-treatments of spin-oriented crystalline polyester filaments, and particularly polyester feed yarns, that have been prepared by spinning at speeds of, e.g., 4 kg/min, and have low shrinkage and no natural draw ratio in the conventional sense, provides useful technique for obtaining uniform drawn filaments of desired denier and thereby provides improved flexibility to obtain filaments and yarns of various denier. The resulting uniform filaments have useful properties that are improved in certain respects.

Abstract: Process of carbon fiber manufacture wherein the polyacrylonitrile precursor is stretched prior to oxidation step of the carbonization operation but after the stretching step of the spinning operation in limited temperature range. Process permits greater throughput in precursor manufacture and reduces flaws in the precursor because significant stretching is at lower line speeds typically used for oxidation and carbonization in making carbon fiber.

Abstract: More whiteness, especially for nylon fibers, is retained when a finish is used to provide to the fiber surface an effective amount of a phenyl phosphinate. Potassium phenyl phosphinate, in amounts as small as 0.005% to 0.3% by weight of the fiber, is particularly effective.

Abstract: A method of conditioning separator mold plates for repeated use in high temperature sequential molding of printed circuit board laminates comprises the step of integrally applying at least one thin, continuous coat, preferably on the order of about 1 microinch, of a silane-based mold release composition prior to each sequential molding operation for facilitating repeated use of the plates in sequential molding operations the silane-based mold release composition is preferably applied in a continuous automated process including a spray gun, preferably of an air atomized type and more preferably of a high transfer efficiency type, for applying the coating followed by an infrared heating step, the separator mold plates being carried by a conveyor through a tunnel including the spray gun and infrared heater.

Abstract: A method of preparing a microporous membrane from unsulfonated poly(etheretherketone)-type polymers.