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| Number | Title | Issue Date |
| 7300617 | Method of making fusion cast articles Fusion cast indium zinc oxide articles and methods of manufacturing fusion cast indium zinc articles are disclosed. The fusion cast indium zinc articles can be used as sputtering targets for forming transparent conductive films. ... | 11/27/2007 |
| 7168932 | Apparatus for nonwoven fibrous web Disclosed is an apparatus for producing nonwoven fibrous webs. The apparatus comprises an extrusion die, first and second fluid supplies in cooperation with the die, first and second extrusion capillaries, first counterbores allowing fluid communication between firs... | 01/30/2007 |
| 6821599 | Porous acrylic fiber and fabric comprising the same, and method of producing the same Porous acrylic fibers produced by a method comprising subjecting a spinning dope containing 0.3 to 20 parts by weight of poly(vinyl acetate) relative to 100 parts of an acrylic copolymer to a wet spinning to give fibers, crimping and cutting the fibers, subjecting t... | 11/23/2004 |
| 6641915 | Acrylonitrile-based fiber bundle for carbon fiber precursor and method for preparation thereof There is disclosed an acrylonitrile fiber bundle for a carbon fiber precursor with a total denier of 30,000 or more consisting of an acrylonitrile polymer comprising 95 wt % or more of an acrylonitrile unit, wherein the surface of filaments composing of t... | 11/04/2003 |
| 6503624 | Carbon fiber precursor fiber bundle and manufacturing method of the same The carbon fiber precursor fiber bundle of the present invention is an acrylonitrile-based fiber bundle wherein the ratio of the length and width of the fiber cross section of a monofilament (length/width) is 1.05 to 1.6, and the amount of Si measured by ... | 01/07/2003 |
| 6428891 | Acrylonitrile-based precursor fiber for carbon fiber and method for production thereof This invention relates to an acrylonitrile-based precursor fiber for carbon fiber which is prepared from an acrylonitrile-based copolymer containing 96.0 to 98.5% by weight of acrylonitrile units, and which is characterized by a tensile strength of not le... | 08/06/2002 |
| 6245423 | Thick acrylic fiber tows for carbon fiber production and methods of producing and using the same An acrylic fiber tow having a total size of at least 22,000 dtex and a weight variation ratio in the longitudinal direction of not greater than 3.5%, which is useful as a precursor for carbon fiber production.... | 06/12/2001 |
| 5840828 | Polyimide fibers A polyimide fiber having textile physical property characteristics and the process of melt extruding same from a polyimide powder. Polyimide powder formed as the reaction product of the monomers 3,4'-ODA and ODPA, and endcapped with phthalic anhydride to ... | 11/24/1998 |
| 5681512 | Process for producing homogeneous phase melt of polyacrylonitrile A process for producing a homogeneous phase melt of polyacrylonitrile suitable for extrusion molding and melt spinning, by the steps of preparing polymer/water crumb containing 30-60 wt % of polyacrylonitrile and dewatering the crumb in a molten state wit... | 10/28/1997 |
| 5436275 | Porous acrylonitrile polymer fiber This invention offers the porous fiber in which the porous form of the fiber is with an excellent durability to heat and accordingly can afford the fiber products with a shape-retaining ability. Porous acrylonitrile fiber comprising the polymers containing not... | 07/25/1995 |
| 5324466 | Method for the production of multi-layered conjugated acrylic fibers A multi-layered conjugated acrylic fiber comprises different acrylic polymers which are conjugated along the fiber axis in layers. On the average the fiber contains more than two layers of acrylic polymers. The shrinkage forming ratio in boiling water of ... | 06/28/1994 |
| 5219501 | Process for the production of acrylic short fibers without spinning A process for the production of pulp-like short fibers having a highly-oriented fibril structure without spinning is provided. This process comprises heating a mixture of water and an acrylonitrile homopolymer or copolymer to a temperature above the melti... | 06/15/1993 |
| 5176862 | Process for the manufacture of stretched rope The stiffness and the tensile strength of a rope containing polymeric filaments manufactured according to the gel spinning process are substantially increased by stretching it. The stretching is preferably carried out at elevated temperature but below the... | 01/05/1993 |
| 5130065 | Method of preparing polyacrylonitrile hollow threads with asymmetric pore structure The process for production of polyacrylonitrile hollow threads with a stable, asymmetric pore structure by a dry-wet-spinning process with glycerine-based core liquids, definite draw and after treatment conditions and a treatment with alcohols and drying.... | 07/14/1992 |
| 5028369 | Process for the production of hydrophilic acrylic fibers A process for the discontinuous or (preferably) continuous production of dry spun hydrophilic acrylic fibers and threads with a core/sheath structure which have improved color fastness properties, more uniform cross-sections and better processing characte... | 07/02/1991 |
| 5015428 | Pan dry spinning process of increased spinning chimney capacity using superheated steam as the spinning gas medium A process for dry spinning of synthetic polymers, in particular PAN threads containing more than 85 wt. % acrylonitrile in the PAN (co)polymer, with high spinning chimney capacities of at least 20 kg PAN solid per spinning chimney and hour, using superhea... | 05/14/1991 |
| 5013502 | Continuous production of acrylonitrile filaments and fibers from spinning material of low residual solvent content A process for the production of crimped filaments and fibers of acrylonitrile polymers of copolymers containing at least 40% by weight acrylonitrile units, by dry spinning from highly polar solvents, where the filaments are brought to extremely low solven... | 05/07/1991 |
| 5013504 | Dry spinning process with hot air and with spinning cell outputs greater than 20 kg per cell per hour A process for the dry spinning of synthetic polymers, in particular polyacylonitrile fibres, from solutions in high polar solvents, such as dimethylformamide, which are heated to 100°-150° C. shortly upstream of the spinneret and spun there by spinneret... | 05/07/1991 |
| 4997610 | Process for producing filaments and fibers of acrylic polymers which contain carboxyl groups A fiber or filament of a swellable polymer of high tensile strength is made by spinning a polymeric raw material which is produced by agitating a suspension of solid particles of an acrylonitrile polymer in dilute sulfuric acid having an acid concentratio... | 03/05/1991 |
| 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 linear velocity ratio of extrusion, thereby forming gel fibers... | 08/28/1990 |
| 4935180 | Formation of melt-spun acrylic fibers possessing a highly uniform internal structure which are particularly suited for thermal conversion to quality carbon fibers An acrylic multifilamentary material possessing an internal structure which is particularly suited for thermal conversion to high strength carbon fibers is formed via a specifically defined combination of processing conditions. The acrylic polymer while i... | 06/19/1990 |
| 4933128 | Formation of melt-spun acrylic fibers which are well suited for thermal conversion to high strength carbon fibers An acrylic multifilamentary material possessing an internal structure which is well suited for thermal conversion to high strength carbon fibers is formed via a specifically defined combination of processing conditions. The acrylic polymer while in substa... | 06/12/1990 |
| 4931233 | Method for adding additives during manufacture of carbon fiber In a method of manufacturing carbon fiber with less uniformity of physical strength in the longitudinal direction, an oil additive in a volatile medium is applied to an organic fiber after it is removed from a container and while the volatile medium has n... | 06/05/1990 |
| 4925604 | Process for preparing a carbon fiber of high strength A carbon fiber of high strength is disclosed, each filament of which is substantially circular in its cross-section but which has circumferential ruggedness which extends in parallel to an axis of the filament to form pleats. The ruggedness has a depth of... | 05/15/1990 |
| 4921656 | Formation of melt-spun acrylic fibers which are particularly suited for thermal conversion to high strength carbon fibers An acrylic multifilamentary material possessing an internal structure which is particularly suited for thermal conversion to high strength carbon fibers is formed via a specifically defined combination of processing conditions. The acrylic polymer while i... | 05/01/1990 |
| 4917836 | Process for producing high-strength, high-modulus carbon fibers A process of producing carbon fibers, which comprises oxidizing polyacrylonitrile filaments having a tensile strength at 240° C. of 0.3 g/d or higher and a tensile modulus at 240° C. of 2.0 g/d or higher in an oxidizing atmosphere under a high tension o... | 04/17/1990 |
| 4913870 | Process for preparing polyacrylonitrile filaments having high tensile strength and modulus Polyacrylonitrile articles, such as filaments, tapes and films, having high tensile strength and modulus, and prepared by adding to a solution of polyacrilonitrile with a molecular weight above 3×105, preferably above 5×105, a mino... | 04/03/1990 |
| 4904424 | Ceramic alloys from colloidal metal alloy suspensions Ceramic alloys or solid solutions are formed by dispersing a powdery metal alloy or intimate mixture of two alloying metals in a precarbonaceous polymer such as polyacrylonitrile, forming the mixture into a molded article such as fibers, and heating the m... | 02/27/1990 |
| 4902452 | Process for producing an acrylic fiber having high fiber characteristics A process for producing an acrylic fiber comprising the steps of: (a) dissolving a polymer having a weight-average molecular weight of at least 5×105 and containing at least 80 wt. % acrylonitrile in a solvent comprising dimethylformamide or dimeth... | 02/20/1990 |
| 4898700 | Process for producing preoxidized fibers from acrylic fibers A process for producing preoxidized fibers, which comprises preoxidizing acrylic fibers having a fluorine-containing surface active agent and at least one phosphoric surface active agent selected from the group consisting of compounds represented by the f... | 02/06/1990 |
| 4883628 | Method for preparing tenacity and modulus polyacrylonitrile fiber Polyacrylonitrile (PAN) fibers are prepared by forming a 2-15 weight % solution of PAN of Mw at least 500,000, extruding, cooling to below the gel temperature, extracting and drying. At least one of the gel fiber, the fiber containing extractio... | 11/28/1989 |
| 4818458 | Method of producing acrylic fibers A spinning solution of an acrylonitrile polymer is subjected to dry-wet spinning through an annular type spinneret having a non-perforated part, i.e. a part not formed with spinning orifices, extending from the outer periphery to the inner periphery. The ... | 04/04/1989 |
| 4812269 | Process for producing hollow fiber semi-permeable membranes Processes for producing semipermeable membranes in the form of hollow fibers are disclosed including extruding a solution of a block copolymer including at least one hydrophilic polymer and at least one hydrophobic polymer while simultaneously injecting a... | 03/14/1989 |
| 4810448 | Processes for the production of dry-spun polyacrylonitrile profiled fibres and filaments A process for the production of acrylonitrile fibers and filaments having a precise cross-sectional profile in which filament-forming synthetic polymers are dry-spun from a solution having a viscosity of at least 120 falling bass seconds, measured at 80°... | 03/07/1989 |
| 4804511 | Process for dry spinning yarns of improved uniformity and reduced adhesion Extraordinarily low ranges of error, with respect to yarn adhesion and uniformity, in dry spinning yarns are achieved when the spinning gas in the upper part of the shaft blasts the yarns radially from the inside to the outside in an apparatus designed fo... | 02/14/1989 |
| 4749496 | Process for removing impurities from mixtures of water with water-miscible solvents Mixtures of water with water-miscible solvent(s) containing suspended, emulsified and/or colloidal impurities are purified by contacting the water-solvent mixture with an at least partially open celled foam containing 1-75 weight percent active pulverulen... | 06/07/1988 |
| 4747987 | Process for the production of filler-containing acrylic and modacrylic fibers Silica-containing acrylic and modacrylic fibres are obtained without spinning defects in that an aqueous silica sol is reacted with a silane and with a polar organic solvent, the sequence in which the two agents are added being optional, the water is dist... | 05/31/1988 |
| 4716055 | Conductive fiber and method of making same A conductive fiber is made by an electroless plating process which is used in conjunction with a wet spinning process. The polymer must be catalyzed before the wet gel is collapsed. The resulting filament has a conductive region which is at least partiall... | 12/29/1987 |
| 4695415 | Method for producing acrylic fiber precursors An acrylic fiber precursor for high performance carbon fibers free of defects which comprises an acrylonitrile polymer containing at least 90% by weight of acrylonitrile and has a surface roughness of 2.0 to 3.0 with dense inner structure. from a solution... | 09/22/1987 |
| 4659529 | Method for the production of high strength polyacrylonitrile fiber Polyacrylonitrile (PAN) fiber of high strength (tensile strengthࣙ20 g/d) produced from a polymer composed mainly of acrylonitrile (AN) and having a weight average molecular weight not less than 400,000, and a method of producing said fiber characterized... | 04/21/1987 |
