Curing Or Polymerization In The Extruder (includes Incomplete Polymerization Or Curing, Or Coagulating Rubber) Patents (Class 264/211.24)
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Patent number: 7666339Abstract: A hydrogel string that is useful as a medical device and a method for forming a hydrogel string that utilizes a delivery device in which gelation of a prepolymer is initiated to form a hydrogel, which is then extruded from the device as the hydrogel string.Type: GrantFiled: March 3, 2006Date of Patent: February 23, 2010Assignee: Bio Cure, Inc.Inventors: Hassan Chaouk, Bruktawit T. Asfaw
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Patent number: 7666338Abstract: An extrusion process for manufacturing powder coating compositions is disclosed. The process generally includes a shear mixing step done at ambient temperature and a focused heating step in which the shear mix is heated to a higher temperature for a shorter time than in conventional methods. The focused heating provides for a shorter heat history, resulting in enhanced coating properties. The mixture may be cooled before it leaves the extruder.Type: GrantFiled: March 25, 2004Date of Patent: February 23, 2010Assignee: PPG Industries Ohio, Inc.Inventors: Joseph M. Ferencz, Vincent A. Gaspar
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Publication number: 20100009189Abstract: Controlled geometry particles of thermoplastic polymers are prepared from compositions containing the thermoplastic polymer and two additives, in the molten state, by cooling the molten composition and disintegrating the resulting dispersion of thermoplastic polymer; powders obtained therefrom advantageously have mean particle diameters ranging from 0.1 to 800 ?m and are useful additives in, e.g., paints and coatings.Type: ApplicationFiled: April 3, 2007Publication date: January 14, 2010Applicant: RHODIA SERVICESInventor: Pascal Herve
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Publication number: 20090295021Abstract: Methods of extruding polyurethane composite materials are described. One method includes introducing at least one polyol and organic and/or inorganic filler to a first conveying section of the extruder, transferring the at least one polyol and organic and/or inorganic filler to a first mixing section of an extruder, mixing the at least one polyol and the organic and/or inorganic filler in the first mixing section, transferring the mixed at least one polyol and organic and/or inorganic filler to a second conveying section of the extruder, introducing a di- or poly-isocyanate to the second conveying section, transferring the mixed at least one polyol and organic and/or inorganic filler and the di- or poly-isocyanate to a second mixing section, mixing the mixed at least one polyol and organic and/or inorganic filler with the di- or poly-isocyanate in the second mixing section of the extruder to provide a composite mixture, and transferring the composite mixture to an output end of the extruder.Type: ApplicationFiled: May 27, 2009Publication date: December 3, 2009Applicant: CENTURY-BOARD USA, LLCInventor: Wade H. Brown
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Publication number: 20090286950Abstract: Process for producing a chemically crosslinked polyurethane film, comprising the following substeps: A) chemically reacting a mixture comprising two or more polyols with one or more polyisocyanates, at least one of the polyols or at least one of the polyisocyanates comprising molecules having a functionality of three or more, and the ratio of the total number of isocyanate groups to the total number of hydroxyl groups being less than 1.Type: ApplicationFiled: May 6, 2009Publication date: November 19, 2009Applicant: tesa AGInventors: Uwe SCHUMANN, Kirstin WEILAND, Sven HANSEN, Esther VON POSSEL
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Publication number: 20090194903Abstract: Disclosed is a nozzle tip, having a tip insert attached to a nozzle tip outlet end of a nozzle tip body, the tip insert being made of a material, or having a thermal barrier coating, having a thermal conductivity value of K<10 W/m° K, and having a lower thermal conductivity than that of the nozzle tip body, to preclude the conduction of excessive heat to the nozzle tip outlet end, and promoting a more decisive fracture of the solidified resin at a gate orifice upon ejection of a molded product, thereby eliminating a string of molten resin and a vestige of excessive height, both of which are undesirable, on the molded product.Type: ApplicationFiled: January 31, 2008Publication date: August 6, 2009Applicant: HUSKY INJECTION MOLDING SYSTEMS LTD.Inventors: Abdeslam Bouti, Stephen Linwood Gray
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Publication number: 20090166919Abstract: A method of manufacturing a cellulose/gelatin composite viscose rayon filament that is characterized by including a process in which a spinning process is carried out while a viscose spinning solution is mixed with a gelatin crosslinking solution, which makes it possible to produce a cellulose/gelatin composite viscose rayon having uniform strength and elongation without yarn disconnection.Type: ApplicationFiled: May 10, 2006Publication date: July 2, 2009Inventors: Masaru Yamada, Kunihiro Ohshima
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Publication number: 20090156078Abstract: The present invention provides flexible binder compositions comprising one or more polycarboxy emulsion copolymer has a measured Tg of 40° C. or less, such as from ?45° C. to 25° C., and a polyol crosslinker. In one embodiment, the binder compositions comprising the polycarboxy emulsion copolymer can be used in making pultruded composites, such as sheets, for example, flexible gypsum board facing sheets, and flexible non-woven articles such as, for example, carpet backing.Type: ApplicationFiled: December 10, 2008Publication date: June 18, 2009Inventors: James T. Connaughton, I, William C. Finch, Michael D. Kelly, Hal C. Morris, Xun Tang
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Patent number: 7528089Abstract: The present invention includes a microporous or mesoporous composition of matter in which the composition is formed continuously or semi-continuously in a heated reactor zone, including a rotary calciner or a rotary screw as a means for conveying the synthesis mixture, at a temperature between 200° C. and 500° C. with a residence time less than 24 hours. The reagents are solid and liquid reagents in which the solid reagents have a weight percent between 45% and 98% of the total reagents. The invention also includes a continuous or semi-continuous process for the hydrothermal manufacture of the microporous or mesoporous composition.Type: GrantFiled: October 15, 2004Date of Patent: May 5, 2009Assignee: ExxonMobil Research and Engineering CompanyInventors: Ivy D. Johnson, Kirk D. Schmitt, Steven T. Ragomo, Stephen G. Casmer
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Publication number: 20090110855Abstract: The present invention provides polymer formulations containing 20 to about 40 weight percent of a filler, such as calcium carbonate. Multilayer polymer structures containing a filler in at least one layer of the multilayer structure, and methods of making these multilayer structures, are also disclosed. Articles of manufacture, such as food service articles, including cups, lids, plates, trays, containers, cutlery, and the like, derived from these formulations and multilayer structures are also provided in the present invention.Type: ApplicationFiled: October 30, 2007Publication date: April 30, 2009Applicant: Dixie Consumer Products LLCInventors: Donald C. McCarthy, William Pucci, Anthony J. Swiontek
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Publication number: 20090099314Abstract: An elastic material for use in an absorbent article is provided. The elastic material contains a crosslinked network formed from a linear block copolymer having a monoalkenyl aromatic midblock positioned between conjugated diene endblocks (e.g., butadiene-styrene-butadiene (“B-S-B”) triblock copolymer). Prior to crosslinking, such linear block copolymers have a relatively low viscosity and thus may be readily formed into a precursor elastic material (e.g., film, strands, web, etc.) that is subsequently crosslinked to achieve the desired elastic and mechanical properties. Crosslinking is typically achieved through the formation of free radicals (unpaired electrons) that link together to form a plurality of carbon-carbon covalent bonds at the conjugated diene endblocks.Type: ApplicationFiled: October 16, 2007Publication date: April 16, 2009Inventors: Oomman P. Thomas, John E. Flood
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Patent number: 7510751Abstract: Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.Type: GrantFiled: October 24, 2007Date of Patent: March 31, 2009Assignee: INVISTA North America S.ar.l.Inventors: Michael Anthony Neal, David A. Harrison, Stephen Derek Jenkins, J. Paul Davis
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Publication number: 20080308967Abstract: The present invention relates to processing of thermoplastic polymers, for example to injection molding and extrusion. More particularly the present invention relates to extrusion of polyolefin resins, especially polyethylene resin, and could be used in manufacture of polymer profile, isolating jacketing at electrical cable, polymer tube and film in blown film process. The present invention is directed to increase rate of defect free extrusion. Other objects of the present invention are: to lower cost of the used additives, to lower amount of additives during extrusion of polymer melts with fillers, to simplify design of equipment, which is used for processing of polymeric materials, to save energy, which is necessary for processing, to improve product appearance and its mechanical performances.Type: ApplicationFiled: October 21, 2004Publication date: December 18, 2008Inventor: Oleg Leonidovich Kulikov
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Publication number: 20080194715Abstract: The present invention relates to the use of copolymers obtainable by copolymerization of at least one ethylenically unsaturated dicarboxylic acid anhydride derived from at least one dicarboxylic acid having 4 to 8 carbon atoms and at least one oligomer of branched or unbranched C3-C10-alkene, where at least one oligomer has an average molecular weight Mn in the range from 300 to 5000 g/mol, preferably up to 1200 g/mol or is obtainable by oligomerization of at least 3 equivalents of C3-C10-alkene, in cosmetic compositions.Type: ApplicationFiled: April 7, 2006Publication date: August 14, 2008Applicant: BASF AKTIENGESELLSCHAFTInventors: Volker Wendel, Darijo Mijolovic, Matthias Kluglein, Hubertus Peter Bell, Matthias Laubender, Helmuth Vollmar, Anja Suckert
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Publication number: 20080118749Abstract: Barrier films are prepared from a blend of two high density polyethylene blend components and a high performance organic nucleating agent. The two high density polyethylene blend components have substantially different melt indices. Large reductions in the moisture vapor transmission rate of the film are observed in the presence of the nucleating agent when the melt indices of the two blend components have a ratio of greater than 10/1. The resulting barrier films are suitable for the preparation of packaging for dry foods such as crackers and breakfast cereals.Type: ApplicationFiled: November 8, 2007Publication date: May 22, 2008Inventors: Norman Dorien Joseph Aubee, Tingting Yu Chuang, Douglas Checknita, P. Scott Chisholm, Patrick Lam, Sarah Marshall, Denny Paul Sauvageau, Tony Tikuisis
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Publication number: 20080057267Abstract: The disclosure provides a composition including a porous cordierite honeycomb body as defined herein having excellent strength, high thermal shock resistance, and reduced microcrack properties. The disclosure also provides methods of making and using the composition, for example, as a catalyst carrier.Type: ApplicationFiled: June 28, 2007Publication date: March 6, 2008Inventors: Yves Andre Henri Brocheton, Dilip Kumar Chatterjee, Michele Fredholm, Gregory Albert Merkel, Steven Bolaji Ogunwumi
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Publication number: 20080048358Abstract: The invention relates to a method and a device for producing Lyocell fibres which are extruded from a cellulose solution of water, cellulose and tertiary amine oxide in a spinning head (25). The cellulose solution is obtained in a number of process steps directly from the cellulose (3, 4) or with the formation of a cellulose suspension. Since the degree of polymerisation decreases in the course of processing the cellulose through to its extrusion in the cellulose solution, with the processing of celluloses with a low degree of polymerisation there is the risk that the endless moulded bodies (2) extruded in the spinning head (25) exhibit defective quality.Type: ApplicationFiled: February 28, 2005Publication date: February 28, 2008Applicant: ZIMMER AKTIENGESELLSCHAFTInventors: Stefan Zikeli, Michael Longin
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Patent number: 7303795Abstract: Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.Type: GrantFiled: March 13, 2003Date of Patent: December 4, 2007Assignee: INVISTA North America S.a. r.l.Inventors: Michael Anthony Neal, David Anthony Harrison, Stephen Derek Jenkins, John Paul Davis
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Patent number: 7279535Abstract: Production of vinyl polymers by the polymerization of vinyl monomers in a planetary gear extruder.Type: GrantFiled: May 18, 2004Date of Patent: October 9, 2007Assignee: tesa AGInventors: Sven Konig, Jessica Erwin, Klaus Massow, Stephan Zollner
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Publication number: 20070222105Abstract: Methods of extruding polyurethane composite materials are described. One method includes introducing at least one polyol and inorganic filler to a first conveying section of the extruder, transferring the at least one polyol and inorganic filler to a first mixing section of an extruder, mixing the at least one polyol and the inorganic filler in the first mixing section, transferring the mixed at least one polyol and inorganic filler to a second conveying section of the extruder, introducing a di- or poly-isocyanate to the second conveying section, transferring the mixed at least one polyol and inorganic filler and the di- or poly-isocyanate to a second mixing section, mixing the mixed at least one polyol and inorganic filler with the di- or poly-isocyanate in the second mixing section of the extruder to provide a composite mixture, and transferring the composite mixture to an output end of the extruder. Other related methods are also described.Type: ApplicationFiled: March 26, 2007Publication date: September 27, 2007Applicant: Century-Board USA, LLCInventor: Wade H. Brown
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Patent number: 7256250Abstract: The object of the present invention is a biodegradable polymer network and methods to make it. The polymer network consists of a cross-linked polyester resin, which is composed of hydroxy acid units, structural units derived from an unsaturated bifunctional monomer, and structural units derived from a polyol monomer. The polyester resin is produced directly by a polyoon-densation reaction, after which it is cross-linked to a polymer of high molecular weight The polyester can be co-polymerised with a co-monomer increasing flexibility, or be blended with a reactive macromonomer, which adds elasticity and crosslinking density. The prepared polymer network can be especially used to coat continuous or singular objects made of fibrous, porous, biomass based or inorganic materials, or as a blending component in these, or used to impregnate these in order to induce water durability, barrier properties, elasticity, coherence or mechanical strength.Type: GrantFiled: October 11, 2002Date of Patent: August 14, 2007Assignee: JVS-Polymers OyInventors: Jukka Tuominen, Janne Kylmä, Jukka Seppälä, Johan-Fredrik Selin
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Patent number: 7195728Abstract: A method of molding a rubber product from a rubber compound by a molding apparatus having a kneading region. A full amount of carbon black (CB) and a full amount of process oil, together with other auxiliary materials except vulcanizing chemicals, are compounded with raw rubber to thereby knead and prepare a granular master batch (granular MB) . The rubber product is extrusion-molded and vulcanized after vulcanizing chemicals (a vulcanizing agent and a vulcanization accelerator) are quantitatively supplied into the kneading region of the molding apparatus through a material supply port while the vulcanizing chemicals are mixed with the granular MB.Type: GrantFiled: April 21, 2003Date of Patent: March 27, 2007Assignee: Toyoda Gosei Co., Ltd.Inventors: Gunpei Katsumura, Tomoaki Okita
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Patent number: 7186362Abstract: A prosthetic medical device exhibiting improved wear resistance is fabricated by sealing at least one polyolefinic material in an airtight container and providing an inert atmosphere within the airtight container. The polyolefinic material is exposed to an irradiation source to yield a cross-linked irradiated polyolefinic material. At least one non-irradiated polyolefinic material is blended with the irradiated polyolefinic material, and the prosthetic medical device is formed from the blended material. Selectively cross-linked polymeric compositions may be created by blending a specific amount of cross-linked resins with a specific amount of uncross-linked resins then cured into a polymeric matrix whereby the desired degree or percentage of overall cross-linking is obtained. The polymeric material may then be formed directly into a finished article by injection molding the polymeric material.Type: GrantFiled: February 25, 2005Date of Patent: March 6, 2007Assignee: Howmedica Osteonics Corp.Inventors: Aiguo Wang, Aaron Essner
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Patent number: 7150842Abstract: A method of extruding a mixture made of a granulate, chips, or powder, etc. of a first thermoplastic and a second thermoplastic is described, the melting range of the first thermoplastic differing from the melting range of the second thermoplastic, using an extruder which has a heatable housing and a screw, which has an intake zone, a melting zone, a delivery zone, and a hole, extending from the intake zone up to the delivery zone, into which a temperature control media may be introduced, in which the temperature control medium causes heating of the screw in the intake zone to a temperature below the melting range of the thermoplastic having the lower melting range and temperature control of the screw in the delivery zone to a temperature which lies between the melting range of the first thermoplastic and the second thermoplastic.Type: GrantFiled: September 29, 2003Date of Patent: December 19, 2006Assignee: NexansInventors: Franz Dänekas, Dirk Köhler
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Patent number: 6930163Abstract: Process for the continuous preparation of thermoplastically processable polyurethane elastomers with improved softening properties is disclosed. The process is carried out in a tubular reactor at a ratio of the circumferential speed of the stirrer (in m/sec) in the tubular reactor and the throughput (in g/sec) of >0.03 m/g.Type: GrantFiled: May 17, 2000Date of Patent: August 16, 2005Assignee: Bayer AktiengesellschaftInventors: Wolfgang Bräuer, Wolfgang Kaufhold, Friedemann Müller, Jürgen Winkler, Herbert Heidingsfeld, Wolfgang Röhrig, Hans-Georg Hoppe
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Patent number: 6911522Abstract: Compositions based on ?-caprolactone polymer, comprising at least one ?-caprolactone polymer and calcium carbonate. Process for preparing these compositions, which are used for manufacturing articles, in particular films, preferably obtained by extrusion blow-moulding or by flat-die extrusion.Type: GrantFiled: January 19, 2001Date of Patent: June 28, 2005Assignee: SOLVAY (Societe Anonyme)Inventors: Dino Manfredi, Ivan Claeys
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Patent number: 6833427Abstract: A polycarbonate resin molding material for optical use which is pellets formed from a polycarbonate resin and having a bulk density of 0.72 kg/l or more and an optical disk substrate formed therefrom. According to the present invention, use of the above pellets makes it possible to obtain an optical disk substrate which rarely experiences the production of a silver streak, reduce the molding cycle and smoothen the molding operation.Type: GrantFiled: January 21, 2003Date of Patent: December 21, 2004Assignee: Teijin Chemicals, Ltd.Inventors: Shinzi Kawano, Fumi Izumi
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Publication number: 20040217512Abstract: The present invention relates to polymeric articles that are colored using an unformulated heat stable black, blue or violet dye during melt processing, for example a melt spinning process. The process eliminates the need for acid bath dyeing of high melt polymeric materials. The polymeric articles are for example polyester or polyamide.Type: ApplicationFiled: March 8, 2004Publication date: November 4, 2004Inventors: Fridolin Babler, Leonardus Franciscus Peeters
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Patent number: 6805945Abstract: A waterproof heat-preservative film is formed by providing a melt of a waterproof material, mixing phase-change microcapsules with the melt to form a mixture, solidifying the mixture and pulverizing the solidified mixture to form particles containing phase-change microcapsules, and forming a film with the particles by means of extruding or blowing.Type: GrantFiled: May 6, 2003Date of Patent: October 19, 2004Assignee: Cheng Loong CorporationInventor: Chieh-Jen Wu
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Patent number: 6803004Abstract: The present invention provides low cost resins (e.g., advanced epoxy resins), processes for making these resins, and coatings made with theses resins. Specifically, the present invention provides high throughput extrusion processing of advanced epoxy resins using an appropriate amount of an iminium salt catalyst. Preferred iminium salt catalysts are stable at room temperature in the reaction mixture (thereby enabling the pre-mixing of ingredients and the stable storage of the pre-mixed ingredients) and yet are highly efficient at the processing temperatures described herein. An example of one such advance epoxy resin is the reaction product of diglycidyl ether of bisphenol A with bisphenol A in the presence of an iminium salt catalyst. Preferred processes are performed using no solvent or only negligible amounts of solvent. One preferred extrusion process utilizes an intermeshing co-rotating twin-screw extruder, however, other types of extruders may alternatively be employed.Type: GrantFiled: October 24, 2001Date of Patent: October 12, 2004Assignee: Valspar Sourcing, Inc.Inventors: Alan Bochan, Thomas R. Mallen, Mike A. Lucarelli
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Publication number: 20040180159Abstract: Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.Type: ApplicationFiled: March 13, 2003Publication date: September 16, 2004Inventors: Michael A. Neal, David A. Harrison, Stephen D. Jenkins, J. Paul Davis
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Patent number: 6790916Abstract: The present invention relates to a process for the production of molding compositions, which can easily be released from the mold. These molding compositions comprise thermoplastic polyurethanes with a hardness of 45 to 65 Shore A, with good mechanical properties, with low shrinkage and good low temperature properties.Type: GrantFiled: February 19, 2003Date of Patent: September 14, 2004Assignee: Bayer AktiengesellschaftInventors: Wolfgang Bräuer, Herbert Heidingsfeld, Hans-Georg Hoppe, Hans-Georg Wussow, Eva Brigitte Eggeling, Wolfgang Röhrig
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Publication number: 20040159972Abstract: A polymer composition is disclosed that comprises a propylene polymer having a melt flow index in the range from 4 to 120 decigrams/minute, di-t-amyl peroxide, and at least one decomposition product of said peroxide, whereby said composition has agreeable odor characteristics.Type: ApplicationFiled: July 23, 2001Publication date: August 19, 2004Inventors: Stefan U. Koschmieder, Peter Frenkel, Ted M. Pettijohn
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Publication number: 20040104500Abstract: A method for producing a plastic scintillator is disclosed. A plurality of nano-sized particles and one or more dopants can be combined with a plastic material for the formation of a plastic scintillator thereof. The nano-sized particles, the dopant and the plastic material can be combined within the dry inert atmosphere of an extruder to produce a reaction that results in the formation of a plastic scintillator thereof and the deposition of energy within the plastic scintillator, such that the plastic scintillator produces light signifying the detection of a radiative element. The nano-sized particles can be treated with an inert gas prior to processing the nano-sized particles, the dopant and the plastic material utilizing the extruder. The plastic scintillator can be a neutron-sensitive scintillator, x-ray sensitive scintillator and/or a scintillator for the detection of minimum ionizing particles.Type: ApplicationFiled: December 3, 2002Publication date: June 3, 2004Inventors: Alan D. Bross, Kerry L. Mellott, Anna Pla-Dalmau
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Publication number: 20040084805Abstract: A continuous process for the preparation of absorbable block copolymers and their processing into monofilament fibers is disclosed. The process comprises a reactive extrusion step where cyclic monomers and other additives are polymerized in stages to form the absorbable block copolymer compositions, which are then continuously extruded and spun into monofilament fibers using regular fiber spinning and drawing techniques.Type: ApplicationFiled: April 28, 2003Publication date: May 6, 2004Inventor: Amy T. Jonn
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Publication number: 20040084804Abstract: A continuous process for the preparation of absorbable polymers and their processing into articles is disclosed. The process comprises a reactive extrusion step where cyclic monomers and other additives are polymerized into absorbable homopolymer or copolymer compositions, which are then extruded continuously and molded into desirable articles using regular molding techniques.Type: ApplicationFiled: April 28, 2003Publication date: May 6, 2004Inventor: Amy T. Jonn
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Patent number: 6720406Abstract: A process for producing polymer pellets is disclosed. The process that is particular suitable for making polycarbonate pellets entails extruding a polymer melt, cooling the extrudate by contacting it with a cooling fluid and pelletizing the solidified polymer. The process is characterized in that the cooling fluid has a solids particle content of at most 10 ppm.Type: GrantFiled: April 30, 2002Date of Patent: April 13, 2004Assignees: Bayer Aktiengesellschaft, Bayer Antwerpen N.V.Inventors: Thomas Elsner, Jürgen Heuser, Christian Kords, Steffen Kühling, Paul Viroux
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Publication number: 20040049002Abstract: A process for making a polyurethane, comprising reacting a multifunctional isocyanate, a polyol and, optionally, a chain extender, wherein at least two reagents selected from the isocyanate, the polyol, the chain extender, any mixture thereof and any pre-polymer formed therefrom, are intensively mixed prior to being reactively extruded, to form a polyurethane having a predetermined stoichiometry and thermal history. The polyurethanes obtained by such a process are of highly consistent composition and are, thus, especially suitable for use in the medical device industry.Type: ApplicationFiled: August 12, 2003Publication date: March 11, 2004Inventors: Geoffrey Andrews, Anthony Johnson
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Publication number: 20040005258Abstract: The invention relates to chemical reactor templates having channel-like voids parallel to the template's major axis. The channel-like voids may have either micro-scale or nano-scale cross sectional areas. The chemical reactor templates may be used to produce micro- and nano-scale filaments and particles which have a variety of uses. In some embodiments a chemical reactor template of the invention have at least two intersecting channel-like voids substantially parallel to the major axis of said template. The invention also relates to methods for manufacturing a chemical reactor template using sacrificial layers. The chemical reactor templates of the invention may be fabricated to have multiple arrays of channel-like structures as well as vertical elements to provide access to act as contacts for the channel-like voids and materials formed within the template. The invention relates to methods for producing filaments and particles using a chemical reactor template.Type: ApplicationFiled: December 12, 2002Publication date: January 8, 2004Inventors: Stephen J. Fonash, Chih-Yi Peng, Ayusmen Sen, Seong H. Kim, Henry C. Foley, Bin Gu, Wook Jun Nam, Kyuhwan Chang
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Patent number: 6637181Abstract: Described is a process for producing segmented polyurethanes having improved processing characteristics in the melt state and an efficient spinning process based thereon to form highly elastic, fine linear density elastane yarn and filament having improved mechanical and thermal properties by using hydroxyalkyl-terminated polysiloxanes in combination with specific crosslinking-capable polyisocyanates in the reaction of long-chain high molecular weight polyhydroxy compounds with organic diisocyanates and low molecular weight diols and also optionally further auxiliary and additive substances in the melt.Type: GrantFiled: December 1, 2000Date of Patent: October 28, 2003Assignee: Bayer AktiengesellschaftInventors: Siegfried Korte, Rolf-Volker Meyer, Stefan Hütte
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Publication number: 20030141623Abstract: A method of making polymeric particulates wherein polymeric scrap material, virgin polymeric material and mixtures thereof are supplied to intermeshing extruder screws which are rotated to transport the polymeric material along their length and subject the polymeric material to solid state shear pulverization and in-situ polymer compatibilization, if two or more incompatible polymers are present. Uniform pulverized particulates are produced without addition of a compatibilizing agent. The pulverized particulates are directly melt processable (as powder feedstock) and surprisingly yield a substantially homogeneous light color product.Type: ApplicationFiled: October 23, 2002Publication date: July 31, 2003Inventor: Klementina Khait
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Publication number: 20030127239Abstract: A process for manufacturing a cylindrical body comprises a step of blending at least two unsaturated polymer chains each having at least one branch with a carbon-carbon double bond and a hydrosilylizing compound having at least two silicon-hydrogen bonds in the presence of at least one hydrosilylation catalyst, the blend obtained being uncrosslinked, and a step of extruding the blend. The crosslinking of the blend by hydrosilylation is completed after the extrusion step. The process is intended in particular to be employed in the cablemaking field.Type: ApplicationFiled: September 3, 2002Publication date: July 10, 2003Inventor: Lionel Fomperie
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Patent number: 6582640Abstract: From about 50 to about 90% by weight of fibers, in particular wood fibers, and/or pellets made from cellulose or from wood, are mixed with from about 10 to about 50% by weight of a hot-curing resin, each of the percentages by weight being based on the total weight of the mixture. Instead of a single resin it is also possible to use a mixture made from two or more hot-curing resins. The mixture made from fibers and/or pellets and resin is kneaded and homogenized and then passed on to an extruder which has various heating zones in which the mixture is heated. Care has to be taken here that the maximum temperature, arising at the extruder exit, does not exceed about 120° C., since above this temperature the resin(s) begin(s) to cure.Type: GrantFiled: February 20, 2001Date of Patent: June 24, 2003Assignee: Trespa International B.V.Inventor: Remco Cornelis Willemse
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Patent number: 6537404Abstract: A thermoplastic polyester resin is fed into a twin extruder, wherein a resin is heated for melting, thereby removing moisture in the resin by evacuating and sucking from a vent port thereof, injecting a foaming agent into the resin to which is pushed out as a foaming sheet and, after that, forming the foaming sheet which is divided into a forming body and a trimming loss, whereby the trimming loss is crushed to obtain crushed materials which are provided so as to put the materials into the twin extruder as collection materials and recycle them.Type: GrantFiled: February 22, 1999Date of Patent: March 25, 2003Assignee: Sekisui Kaseihin Kogyo Kabushiki KaishaInventors: Susumu Ishiwatari, Masahiro Tsubone, Takaaki Hirai, Masahiro Shindo, Kiyoshi Yoshioka, Nobuyuki Tsujiwaki
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Patent number: 6537473Abstract: Polyolefin fibers and polyolefin yarns of high strength and elongation and textile fabrics produced therefrom, which consist of modified propylene polymers, unmodified propylene polymers and adjuvants, are produced by melting the polyolefin mixtures in the extruder, transferring the melt by extrusion pumps to the spinnerets and drawing off the extruded filaments by high-speed galettes and/or winders.Type: GrantFiled: December 8, 2000Date of Patent: March 25, 2003Assignee: Borealis GmbHInventors: Manfred Raetzsch, Ulf Panzer, Achim Hesse, Norbert Reichelt, Manfred Kirchberger, Peter Niedersuess, Anton Wolfsberger
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Patent number: 6524516Abstract: The present invention relates to apparatus for extruding mouldings from cross-linkable polymer material. The apparatus includes a first part to which the polymer material is delivered from a material container, and a second part which forms a moulding tool for moulding and cross-linking said article. The first part of the apparatus includes a feed zone (2) that has an inlet (8), a generally tubular outlet (7) and a rotatable feed screw (10) that functions to compress and feed the polymer material in a unmelted or solid state from said inlet (8) to said outlet (7), wherein the length of the feed screw (10) does not exceed the length of the feed zone (2).Type: GrantFiled: October 22, 1999Date of Patent: February 25, 2003Assignee: Wirsbo Burks ABInventors: Jan Rydberg, Nils-Olof Johnsson, Curt Axelsson, Michael Sjöberg
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Publication number: 20020180099Abstract: A process and apparatus for preparing compositions including one or more resinous materials and/or other ingredients using a continuous reactor combined with a slurry vessel for feeding a slurry feed stream to the reactor. More specifically, the process and apparatus prepares a composition by feeding a reactive slurry of one or more monomers and/or oligomers into a continuous reactor extruder to manufacture one or more resinous materials. Optionally, the resinous material may be continuously conveying to a mixer for continuously mixing the resinous material with other ingredients to form a blended composition.Type: ApplicationFiled: June 19, 2002Publication date: December 5, 2002Inventor: Peter T. Keillor
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Publication number: 20020171164Abstract: A thermosetting foam, preferably a polyurethane foam is prepare by mixing all the components in one or more extruders and directing the chemical streams to a mixing head where the catalyst is added. Thus, the reaction can be controlled in a facile manner, whereby clogging of the extrusion head is avoided.Type: ApplicationFiled: May 15, 2001Publication date: November 21, 2002Inventors: Steve Halterbaum, David G. Wernsing
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Patent number: 6465583Abstract: Continuous anionic polymerization and melt-spinning of a polycaprolactam includes forming a reaction mixture by bringing at least two streams of liquid caprolactam respectively containing a polymerization initiator and co-initiator into contact with one another, and then subjecting the reaction mixture to anionic polymerization reaction conditions to obtain a molten polycaprolactam. The molten polycaprolactam is the directly (i.e., without intermediate solidification) transferred to, and extruded through, a fiber-forming orifice of a spinneret to form a fiber thereof. One exemplary system to achieve such continuous anionic polymerization and melt-spinning of polycaprolactam includes a mixer for receiving and mixing at least two streams of liquid caprolactam respectively containing a polymerization initiator and co-initiator, and a reactor and melt-spinning apparatus downstream of the mixer.Type: GrantFiled: June 13, 2001Date of Patent: October 15, 2002Assignee: BASF CorporationInventors: Dominick A. Burlone, Matthew B. Hoyt, Charles F. Helms, Jr., John A. Hodan, Richard Kotek, Carol W. Morgan, Randall A. Sferrazza, Fang A. Wang, Otto M. Ilg, Terry D. Roberts, Ronald G. Morrow
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Patent number: 6454976Abstract: Polyethylene having a broad molecular weight distribution is extruded in pellet form using a pelletizing extruder having one or more zones essentially filled with the polyethylene and two or more zones partially filled with the polyethylene. The polyethylene is fed into the extruder at a temperature sufficient to melt the polyethylene, and a mixture of an inert gas and oxygen is fed into at least one partially filled zone of the extruder with the exception of the feed zone. The mixture contains about 1 to about 21% by volume oxygen based on the volume of the gas mixture.Type: GrantFiled: May 3, 1999Date of Patent: September 24, 2002Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Anthony Charles Neubauer