With Stretching In Bath Of Extruded Article Patents (Class 264/181)
-
Patent number: 11566124Abstract: A crosslinked rubber composition contains a rubber component and para-aramid short fibers having a filament fineness of 2.5 dtex or more and dispersed in the rubber component.Type: GrantFiled: September 21, 2020Date of Patent: January 31, 2023Assignee: BANDO CHEMICAL INDUSTRIES, LTD.Inventors: Takayuki Okubo, Masashi Kitatsuji, Takuya Mori, Taiichi Okada
-
Patent number: 9988744Abstract: A viscose multifilament yarn has a crystallinity in the range from 15% to 40%, and, after conditioning in the standard climate according to DIN EN ISO 139:2005, a yarn linear density in the range from ?150 dtex to <1100 dtex and a tensile strength in the range from ?45 cN/tex to ?55 cN/tex.Type: GrantFiled: January 24, 2014Date of Patent: June 5, 2018Assignee: CORDENKA GMBH & CO. KGInventors: Dennis Mössinger, Holger Scheytt, Kurt Uihlein, David Wunderlich, Britta Zimmerer
-
Patent number: 8728371Abstract: A method of producing a stretched film comprising melt-coextruding a thermoplastic resin A and a thermoplastic resin B to produce a composite film 1 having both-end films 2 of the thermoplastic resin B arranged in parallel at both end portions of the main film 1a of the thermoplastic resin A in the direction of width thereof, stretching the composite film, and cutting and removing both end portions of the stretched film in the direction of width, wherein a film stretch stress value of the both-end films 2 is larger than a film stretch stress value of the main film 1a at the same stretching ratio. This minimizes an increase in the thickness at both end portions of the film in stretching the film and decreases the widths by which both end portions of the expensive resin film are to be cut and removed for producing a film.Type: GrantFiled: December 7, 2007Date of Patent: May 20, 2014Assignee: Toyo Kohan Co., Ltd.Inventors: Norimasa Maida, Yoshimi Itoh, Toshiyuki Ueda
-
Patent number: 8246886Abstract: A method and system for aligning nanotubes within an extensible structure such as a yarn or non-woven sheet. The method includes providing an extensible structure having non-aligned nanotubes, adding a chemical mixture to the extensible structure so as to wet the extensible structure, and stretching the extensible structure so as to substantially align the nanotubes within the extensible structure. The system can include opposing rollers around which an extensible structure may be wrapped, mechanisms to rotate the rollers independently or away from one another as they rotate to stretch the extensible structure, and a reservoir from which a chemical mixture may be dispensed to wet the extensible structure to help in the stretching process.Type: GrantFiled: July 9, 2008Date of Patent: August 21, 2012Assignee: Nanocomp Technologies, Inc.Inventors: David S. Lashmore, Robert Braden, Anastasios John Hart, John Welch
-
Patent number: 7935418Abstract: The invention relates to a method for the preparation of porous polymeric fibres comprising functionalized or active particles. By extruding a mixture of one or more dissolved polymers with particulate material a porous fibre is obtained in which the particulate material is entrapped. Extrusion of the fibre occurs under two-step phase inversion conditions. In particular the porous fibres can be used for the isolation of macromolecules such as peptides, proteins, nucleic acids or other organic compounds from complex reaction mixtures, in particular from fermentation broths. Another application is the immobilization of a catalyst in a reaction mixture.Type: GrantFiled: June 30, 2003Date of Patent: May 3, 2011Assignee: Mosaic Systems B.V.Inventors: Geert-Hendrik Koops, Maria Elena Avramescu, Zandrie Borneman, Ryotaro Kiyono, Matthias Wessling
-
Patent number: 6245876Abstract: The present invention relates to a continuous shaped article such as a polyurethaneurea fiber and a polyurethaneurea film having a birefringence index (&Dgr;n) of from at least 1.0×10−4 to 8.0×10−4 in a nontensile state, a crosslinking density at an elongation of 100% (N100) of at least 5.0×1026/m3, a crosslinking point density at an elongation of 400% (N400) of from 4.0×1026 to 3.0×1027/m3, and a crosslinking point density at the time of breakage (Nt) of at least 1.6×1027/m3, wherein the ratio of the crosslinking density at an elongation of 400% to that at an elongation of 100% (N400/N100) is from 0.9 to 1.3, and a process for producing the same. The present invention has made the continuous shaped article show an initial stress, a strength at break and an elongation at break which are sufficiently high, and a small rise in the stress in the medium elongation range.Type: GrantFiled: August 27, 1999Date of Patent: June 12, 2001Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Hiroyuki Hanahata, Yoshihiko Shimaya
-
Patent number: 6174358Abstract: A method for producing cellulose particles whereby a cellulose solution is dispersed in a regenerant or nonsolvent and the cellulose is regenerated or precipitated in dispersed form into cellulose particles.Type: GrantFiled: September 24, 1998Date of Patent: January 16, 2001Assignee: Cellcat GmbHInventors: Jörg Oberkofler, Alexander Brandner, Jeffrey F. Spedding, Anton Schmalhofer
-
Patent number: 5976439Abstract: A process for preparing an alginate rope, which process comprises the steps of: (a) extruding an aqueous solution of a water soluble alginate into a coagulation bath; (b) contacting the extruded water soluble alginate with a source of a cation capable of forming a water insoluble alginate salt so as to produce a tow of water insoluble alginate fibers; (c) twisting the water insoluble alginate fibers of the tow; and (d) stretching the fibers up to 250% of their original length. The alginate rope prepared according to the process of the invention may be used as a surgical pack material or in the treatment of cavity wounds.Type: GrantFiled: June 27, 1997Date of Patent: November 2, 1999Assignee: Bristol-Myers Squibb CompanyInventors: Peter M. J. Mahoney, Bryan Griffiths, John Charles Fenton
-
Patent number: 5906890Abstract: There is disclosed a polypropylene fiber which is suitable for hot rolling and which is used for producing a non-woven fabric having high tenacity and good feel by heat rolling within a wide range of processing temperatures.A polypropylene fiber contains boiling n-heptane extract in the amount of 1.5 to 5 percent by weight after extraction with boiling n-hexane, and the extract has a melting point peak of 140.degree. C. or higher.Type: GrantFiled: August 14, 1997Date of Patent: May 25, 1999Assignee: Chisso CorporationInventors: Masahiko Taniguchi, Hidemi Ito, Yoshimi Tsujiyama
-
Patent number: 5310866Abstract: Process for stretching an article substantially consisting of a flexible-chain polymer, which is swollen in a solvent for that polymer, in which process an article substantially consisting of a copolymer of the polymer with a second polymer is swollen in a selective solvent for the flexible-chain polymer, and stretched, and an article containing an oriented flexible-chain polymer with a dichroic ratio of at least 1.1.Type: GrantFiled: August 31, 1992Date of Patent: May 10, 1994Assignee: DSM N.V.Inventors: Hendrikus J. J. Rutten, Adrianus W. M. Braam
-
Patent number: 5296286Abstract: A process for preparing subdenier fibers and structures thereof from isotropic polymer solutions is disclosed. The process comprises extruding a stream of the polymer solution into a chamber, introducing a pressurized gas into the chamber, directing the gas in the flow direction of and in surrounding contact with the stream within the chamber, passing both the gas and the stream into a zone of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and contacting the fragmented stream in the zone with a coagulating fluid.Type: GrantFiled: January 11, 1993Date of Patent: March 22, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventors: Steven R. Allen, David M. Gale, Aziz A. Mian, Sam L. Samuels, Hsiang Shih
-
Patent number: 5276083Abstract: This invention is directed to continuous polyester filaments in tufted form for composing quality carpets having a pleasing appearance. The carpets are formed by use of continuous polyester filaments comprising polyethylene terephthalate resin having at least 85 mol % of ethylene terephthalate. The filament is completed by being placed in a curling stuffing box and applying a flow of heated air.Type: GrantFiled: August 24, 1992Date of Patent: January 4, 1994Assignee: Kabushiki Kaisha ShinkashoInventor: Mitsuru Kawauchi
-
Patent number: 5268133Abstract: Ultra-oriented, crystalline synthetic filaments with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath maintained at a temperature of at least 30.degree. C. above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 7-9 g/d, break elongation of 14-30% and boil-off shrinkage of 5-10%.Type: GrantFiled: February 4, 1992Date of Patent: December 7, 1993Assignee: North Carolina State UniversityInventors: John A. Cuculo, Paul A. Tucker, Gao-Yuan Chen, Ferdinand Lundberg
-
Patent number: 5254303Abstract: In a method and device for shaping thread-forming materials from a homogeneous isotropic or anisotropic, single or multiphase liquid multicomponent system, the liquid multicomponent system is forced through nozzle openings into a liquid which is under pressure. The liquid is moved in the direction of travel in a channel system composed of sections with constant and/or slightly tapering cross sections, and the flow rate of the liquid is increased accordingly.Type: GrantFiled: June 17, 1992Date of Patent: October 19, 1993Assignee: Akzo N.V.Inventors: Karl Ostertag, Gerhard Ries, Alfons Leeb
-
Patent number: 5252396Abstract: The present invention relates to a shaped material consisting of a layer having open microvoids (hereinafter referred to as light-scattering layer) and a layer having a hue different from that of the light-scattering layer (hereinafter referred to as color-developing layer), the light-scattering layer constituting at least part of the outer surface of the shaped material and the color-developing layer constituting the rest of the shaped material, which shaped material changes its color reversibly depending upon its moist or dry condition, as well as to a process for producing said shaped material.Type: GrantFiled: December 19, 1991Date of Patent: October 12, 1993Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Yuichi Fukui, Hajime Itoh, Shigeki Hagura, Itsumi Muraoka
-
Patent number: 5171504Abstract: The invention provides improved thermoplastic high strength, highly oriented fibers and a process for producing the fibers by melt spinning a thermoplastic polymer to form a threadline, preferably passing the threadline through a thermal conditioning zone and then quenching the threadline. The quenched threadline is passed through a hydraulic drag bath maintained at a temperature of greater than the glass transition temperature of the polymer which substantially increases the threadline stress and results in drawing of the threadline. The threadline is withdrawn from the drag bath at a withdrawal rate of at least 3,000 meters per minute.Type: GrantFiled: March 28, 1991Date of Patent: December 15, 1992Assignee: North Carolina State UniversityInventors: John A. Cuculo, Paul A. Tucker, Chon-Yie Lin, Ferdinand Lundberg
-
Patent number: 5149480Abstract: Ultra-oriented, crystalline synthetic filaments with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath maintained at a temperature of at least 30.degree. C. above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 7-9 g/d, break elongation of 14%-30% and boil-off shrinkage of 5%-10%.Type: GrantFiled: May 18, 1990Date of Patent: September 22, 1992Assignee: North Carolina State UniversityInventors: John A. Cuculo, Paul A. Tucker, Gao-Yuan Chen, Ferdinand Lundberg
-
Patent number: 5064596Abstract: A process for preparing a slender or thin ceramic green body, which comprises discharging a raw material slurry comprising a ceramic powder raw material, a binder and a solvent from a discharge outlet in a slender or thin shape, and then contacting it with a solidifying liquid composed of a liquid in which the solvent is soluble and the ceramic powder raw material and the binder are insoluble or hardly soluble so that the solvent in the slurry is dissolved and removed to form the green body.Type: GrantFiled: August 28, 1990Date of Patent: November 12, 1991Assignee: Mitsubishi Kasei CorporationInventors: Yukio Chida, Tetsuhiko Mishimura, Yasuo Oguri
-
Patent number: 5019316Abstract: A system for producing a drawn yarn having a durable mechanical and thermal stability in practical use from a fiber-forming polymer by means of a single continuous process is disclosed. A yarn extruded from a spinneret is first introduced into a liquid bath for cooling and subsequently to a hot chamber filled with a pressurized steam for heat-treatment, in which the yarn is drawn against a resistance caused by the liquid bath. The vessel of the liquid bath is provided with a yarn exit path adapted to allow the passage of the yarn but inhibit the leakage of the liquid and to remove a concomitant liquid from the yarn. The hot chamber is provided with inlet and outlet paths for the yarn also adapted to allow the passage of the yarn but inhibit the leakage of the steam. The system is suitable for producing for industrial use a yarn composed of thicker individual filaments.Type: GrantFiled: July 24, 1989Date of Patent: May 28, 1991Assignee: Toray Industries, Inc.Inventors: Kunihiko Ueda, Katsumi Hasegawa, Nobuyuki Kuriyama
-
Patent number: 4965033Abstract: A process for spinning high-strength high-modulus, aromatic polyamide filaments is disclosed in which an acid solution containing at least 30 g per 100 ml acid of aromatic polyamide having an inherent viscosity of at least 4 and chain-extending bonds which are either coaxial or parallel and oppositely directed is extruded through a layer of inert noncoagulating fluid into a coagulating bath and then through a spin tube along with overflowing coagulating liquid. Additional coagulating liquid is jetted symmetrically about the filaments in a downward direction forming an angle of 0.degree. C. to 85.degree. with respect to the filaments within about 2.0 milliseconds from the time the filaments enter the spin tube. The flow rates of the jetted and the overflowing coagulating liquids are maintained constant. In the process, the mass-flow ratio, i.e.Type: GrantFiled: March 26, 1990Date of Patent: October 23, 1990Assignee: E. I. du Pont de Nemours and CompanyInventor: Minshon J. Chiou
-
Patent number: 4963298Abstract: Process for preparing subdenier fiber and structures thereof from lyotropic liquid crystalline polymers comprising extruding a stream of the polymer into a chamber, introducing a pressurized gas into the chamber, directing the gas in the flow direction of and in surrounding contact with the stream within the chamber, passing both the gas and the stream into a zoner of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and contacting the fragmented stream in the zone with a coagulating fluid.Type: GrantFiled: February 1, 1989Date of Patent: October 16, 1990Assignee: E. I. Du Pont de Nemours and CompanyInventors: Steven R. Allen, Aziz A. Mian, Sam L. Samuels
-
Patent number: 4898704Abstract: Coagulating a warp of filaments from a linear spinneret by delivering a transparent, jetted sheet of coagulating liquid equally and uniformly along each side of the warp.Type: GrantFiled: August 30, 1988Date of Patent: February 6, 1990Assignee: E. I. Du Pont De Nemours & Co.Inventor: David W. Luckey
-
Patent number: 4876040Abstract: A process for preparing aromatic polyamide fibers wherein an aromatic diamine and an aromatic diacidchloride are dissolved in an amide polymerization solvent containing an inorganic salt, a partial polymerization is effected at a low temperature to form an optically anisotropic liquid crystalline prepolymer dope, and the liquid crystalline prepolymer dope is subjected to a molecular orientating polymerization in a polymerization accelerating-precipitation solvent to provide aromatic polyamide fibers free of a crystal defect layer perpendicular to the fiber axis and having high strength and high degree of molecular orientation.Type: GrantFiled: March 10, 1987Date of Patent: October 24, 1989Assignee: Kolon Industries, Inc.Inventors: Ho J. Park, Moo S. Rhim, Hak M. Kim, Du H. Kim, Seog C. Yoo, Sang H. Kim, Sa Ng B. Park, Ink S. Han, Jong T. Park, Si M. Kim
-
Patent number: 4865902Abstract: A multi-layered, heat shrinkable film is disclosed which possesses one or two outer layers of a polyolefin and a core layer of material having a melting point below the temperature required to orient the material of the outer layer or layers, the core layer comprising 50 to 95% of the overall thickness of the film.Type: GrantFiled: March 8, 1988Date of Patent: September 12, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ralph C. Golike, Robert W. Thies
-
Patent number: 4836507Abstract: Directly spinning highly oriented staple fibers of para-aramids using a dry-jet wet-spinning process in which the filaments in the gap between the spinneret and the coagulating fluid are attenuated with a liquid jetted symmetrically about the filaments at a rate sufficient to break the filaments intermittently to form staple length fibers that taper along their length from an enlarged head.Type: GrantFiled: August 10, 1987Date of Patent: June 6, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventor: Hung H. Yang
-
Patent number: 4728473Abstract: A process for the preparation of poly-p-phenylene terephthalamide fibers according to the wet spinning method comprising passing an optically anisotropic solution of a poly-p-phenylene terephthalamide type polymer through a non-coagulating fluid layer and guiding the solution to a coagulating bath, characterized in that (a) filaments are taken out together with a stream of a coagulating solution from fine tube or fine hole arranged in the lower portion of the coagulating bath and the filaments are travelled through a second fine tube or fine hole arranged below said fine tube or fine hole through a space, and (b) in the fine tube or fine hole arranged in the lower portion of the coagulating bath, the stream of the coagulating solution flowing out together with the filaments is accelerated and in the second fine tube or fine hole, the speed of the stream of coagulating solution accompanying the filaments is decreased.Type: GrantFiled: February 27, 1984Date of Patent: March 1, 1988Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Eiji Satoh, Jun Yamaguchi
-
Patent number: 4391875Abstract: The abrasion resistance and tensile strength of asbestos is significantly improved by the addition of significant amounts of metal oxides, such as iron oxide, under conditions to provide at least some surface bonding of the oxides to the surface of the asbestos. The oxides are preferably added during formation of bodies from asbestos dispersions and also impart color to the final product.Type: GrantFiled: December 11, 1980Date of Patent: July 5, 1983Assignee: RM Industrial Products Company, Inc.Inventors: Byeong H. Jo, Jerry Zucker
-
Patent number: 4340559Abstract: Improved aromatic polyamide fibers from aromatic polyamides whose chain-extending bonds are either coaxial or parallel and oppositely directed are obtained by dry spinneret wet spinning into a shallow coagulating bath having an orifice in its bottom for removal of coagulating liquid and fibers wherein no more than a minor portion of coagulating liquid is lower than the entrance of the bath orifice in the proximity of the bath orifice. Preferably, no more than 10% of the coagulating liquid is lower than the entrance of the bath orifice and most preferably none of the coagulating liquid is lower than the entrance of the bath orifice.Type: GrantFiled: October 31, 1980Date of Patent: July 20, 1982Assignee: E. I. Du Pont de Nemours and CompanyInventor: Hung H. Yang
-
Patent number: 4298565Abstract: A process for preparing high strength, high modulus aromatic polyamide filaments by extruding an acid solution containing at least 30 g. per 100 acid of an aromatic polyamide having an inherent viscosity of at least 4 and chain extending bonds which are either coaxial or parallel and oppositely directed through a layer of inert noncoagulating fluid into a coagulating bath and then through a spin tube along with overflowing coagulating liquid is improved by jetting additional coagulating liquid symmetrically about the filaments in a downward direction forming an angle .theta. or 0.degree. to 85.degree. with respect to the filaments within 2.0 milliseconds from the time the filaments enter the spin tube, the flow rates of both the jetted and overflowing coagulating liquid being maintained at a constant rate such that their momentum ratio .phi. is from 0.5 to 6.0 and the mass flow rate of total coagulating liquid is from 70 to 200 times the mass flow rate of the filaments.Type: GrantFiled: February 12, 1980Date of Patent: November 3, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Hung H. Yang
-
Patent number: 4274900Abstract: The multi-layer polyester/polyolefin shrink film of this invention provides a combination of shrink tension, hot seal strength, sealability, and shrink temperature range heretofore unobtainable in an oriented, monolayer polyolefin material. The preferred film has five layers in which the middle layer comprises a polyester or copolyester, two inner layers adjacent the middle layer comprise ethylene-vinyl actate copolymer, and the skin or outer layers comprise an ethylene-propylene copolymer.Type: GrantFiled: July 9, 1979Date of Patent: June 23, 1981Assignee: W. R. Grace & Co.Inventors: Walter B. Mueller, Henry G. Schirmer, Julian H. Schoenberg, Alan S. Weinberg
-
Patent number: 4261943Abstract: This invention relates to a process for treating the surface of cellulosic shaped products such as fibers, films filaments, yarns and the like, formed from a spinning dope of a solution of cellulose in amine oxide, by applying to the surface of the product a nonsolvent liquid that will reduce the solvent action of the amine oxide for cellulose at the surface of the product.Type: GrantFiled: July 2, 1979Date of Patent: April 14, 1981Assignee: Akzona IncorporatedInventor: Clarence C. McCorsley, III
-
Patent number: 4159299Abstract: A method and apparatus for the production of rayon and for the continuous processing of filaments is disclosed. Filament threads are formed in a spinning column in which they are completely regenerated and stretched by the action of a constant temperature coagulating solution. The total length of the spinning column considerably exceeds the length of the column portion in which the rayon yarns are formed. The coagulating solution, after the formation of the rayon yarns, flows at a speed less than that of the threads at the column outlet eliminating an entire zone to the treatment of spun threads with strong high-temperature solution, heretofore necessary for complete regeneration of the threads.Type: GrantFiled: April 6, 1976Date of Patent: June 26, 1979Inventors: Arkady T. Serkov, Gennady A. Budnitsky, Nina P. Shishkina, Viktor A. Kalitin, Boris M. Sokolovsky, Leonid A. Bylinsky, Evsei M. Mogilevsky, Igor P. Baksheev, Lev G. Marakhovsky, Viktor V. Markov, Nadezhda F. Rumyantseva, Alexandr S. Daniljuk, Ljudmila N. Panova, Oleg S. Kozyrev, Lev G. Kaller, Viktor L. Silyanchik, Georgy G. Finger, Ivan G. Shimko, Valery V. Konoplev, Albina K. Khakimova
-
Patent number: 4154856Abstract: Stretched fibers or fibrils from single-cell dopes are prepared by extruding the dope into a moving coagulating bath wherein the fluid motion of the bath causes the extrudate to gradually stretch. The resultant stretched fibers are useful as textured food products.Type: GrantFiled: March 20, 1978Date of Patent: May 15, 1979Assignee: Standard Oil Company (Indiana)Inventor: Cavit Akin
-
Patent number: 4115991Abstract: Coherent strands are made from a dispersion of asbestos fibres in an aqueous soap solution containing up to 100 percent molar excess of fatty acid, by a process including the steps of forming a stream of dispersion and chilling the newly formed stream sufficiently to gel the dispersion.Type: GrantFiled: February 23, 1976Date of Patent: September 26, 1978Assignee: TBA Industrial Products Ltd.Inventors: Anthony N. Magnall, Philip H. Taylor, Fred Roberts
-
Patent number: 4078034Abstract: The strength of aromatic polyamide filaments spun at high speed downwardly through a non-coagulating fluid into a liquid coagulating bath and subsequently through a spin tube containing the freshly spun filaments and coagulating liquid is improved when the filaments are abruptly deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube.Type: GrantFiled: December 21, 1976Date of Patent: March 7, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventor: Gary Brett Lewis
-
Patent number: 4070431Abstract: The salt content of neutralized aromatic polyamide fibers spun from an acid solution downwardly into a spin tube containing the fibers and a coagulating liquid is reduced when a gas is injected into the spin tube 0.25 to 20 cm. downstream from the entrance of the spin tube.Type: GrantFiled: December 21, 1976Date of Patent: January 24, 1978Assignee: E. I. Du Pont de Nemours and CompanyInventors: Gary Brett Lewis, Stephen Donald Moore
-
Patent number: 4064296Abstract: A heat shrinkable multi-layer packaging film having a layer of a hydrolyzed ethylene-vinyl acetate copolymer. Preferably, the film is formed by coextruding the hydrolyzed ethylene-vinyl acetate copolymer layer between two other polymeric layers, at least one of which is cross-linkable, and thereafter irradiating and orienting the multi-layer structure. The resulting film is heat shrinkable and has very low oxygen permeability.Type: GrantFiled: October 2, 1975Date of Patent: December 20, 1977Assignee: W. R. Grace & Co.Inventors: Norman D. Bornstein, Donald J. D'Entremont, Alan S. Weinberg, Henry G. Schirmer, Joseph Zu Sun
-
Patent number: 3996321Abstract: In a process for forming fibers by extruding a spinning dope successively through a layer of inert gas and a tube immersed in a coagulating bath, the tension profile of the yarn passing through the tube is regulated by regulating the pressure of the layer inert gas. In this pressurized quench system, the coagulating liquid is maintained at a predetermined level, despite transient changes in liquid input, by passing both pressurized gas and coagulating liquid through a pipe having an opening at the level to be maintained.Type: GrantFiled: November 26, 1974Date of Patent: December 7, 1976Assignee: E. I. Du Pont de Nemours and CompanyInventor: Charles Brian Weinberger