Patents by Inventor Jurgen Hofmann
Jurgen Hofmann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20030047831Abstract: In a method for granulating thermoplastic polymers, in particular thermoplastic polyolefins, the polymer powder prepared in the polymerization reactor is melted and homogenized in an extruder, then forced through an extrusion die and granulated. In accordance with the invention, the polymer powder is subjected to heat treatment before introduction into the extruder, resulting in the introduction of the polymer powder into the extruder being carried out at an elevated powder temperature. The invention is particularly suitable for the granulation of polyethylene or polypropylene.Type: ApplicationFiled: September 13, 2002Publication date: March 13, 2003Inventors: Michael Witt, Rainer Anderlik, Jurgen Hofmann, Thomas Kessler, Farid Rizk, Wolfgang Bickel
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Publication number: 20030015814Abstract: The present invention relates to an apparatus for producing solid active ingredient-containing forms from an active ingredient-containing formulation which comprises at least one polymeric binder. The apparatus according to the invention has at least one extruder 1 for continuous plastication of the formulation and at least two injection units 2 which are provided separate from one another, each of which is connected to the extruder 1, and through which the formulation can be injected into at least one mold 3.Type: ApplicationFiled: June 13, 2002Publication date: January 23, 2003Inventors: Harald Krull, Jorg Rosenberg, Jorg Breitenbach, Jurgen Hofmann, Rainer Klenz, Hans Buhrle
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Patent number: 6498232Abstract: Shear forces are used for essentially salt-free coagulation of plastics dispersions or rubber dispersions. For this, method of use is made of an apparatus with at least one shearing module which has a stator and a rotor arranged within the stator, where the surfaces facing toward one another in the stator and in the rotor are in each case smooth, or at least the rotor exhibits a structure formed on its surface and facing from this in the direction of the stator, and between the stator and the rotor there is a gap of predetermined gap width. The process is carried out by passing the dispersion to be coagulated through the gap between stator and rotor and precipitating the dispersion by rotation of the rotor with predetermined shear rate and shear deformation.Type: GrantFiled: May 31, 2001Date of Patent: December 24, 2002Assignee: BASF AktiengesellschaftInventors: Norbert Güntherberg, Jürgen Hofmann, Alexander Ludwig, Hartmut Heinen, Gerd Ehrmann, Peter Barghoorn, Andreas Kleinke, Sven Grabowski, Rainer Nachtrab, Bernhard Czauderna
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Patent number: 6455612Abstract: This invention provides an apparatus and method for injecting an additive directly into a polymer melt stream. The method comprises supplying a melt flow of a polymeric host material to a die assembly having a thin-plate assembly and injecting at least one additive into at least one predetermined location in a cross-section of the melt flow of the polymeric host material while the melt flow passes through the die assembly. The method achieves uniform dosing of the one or more additives in the extrusion direction in the polymeric host material without homogeneously mixing the one or more additives and the polymeric host material. The apparatus for directly injecting one or more additives into a polymer melt stream comprises a pumping system, a die assembly having a thin-plate assembly, and a distribution line.Type: GrantFiled: February 27, 2001Date of Patent: September 24, 2002Assignee: BASF CorporationInventors: Charles F. Helms, Jr., Dominick A. Burlone, James L. Huff, Thomas Kessler, Herman Brandt, Walter Gotz, Jürgen Hofmann
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Patent number: 6391239Abstract: This invention provides an apparatus and method for injecting an additive directly into a polymer melt stream. The method comprises supplying a melt flow of a polymeric host material to a die assembly having a thin-plate assembly and injecting at least one additive into at least one predetermined location in a cross-section of the melt flow of the polymeric host material while the melt flow passes through the die assembly. The method achieves uniform dosing of the one or more additives in the extrusion direction in the polymeric host material without homogeneously mixing the one or more additives and the polymeric host material. The apparatus for directly injecting one or more additives into a polymer melt stream comprises a pumping system, a die assembly having a thin-plate assembly, and a distribution line.Type: GrantFiled: December 8, 2000Date of Patent: May 21, 2002Assignee: BASF CorporationInventors: Charles F. Helms, Jr., Dominick A. Burlone, James L. Huff, Thomas Kessler, Herman Brandt, Walter Gotz, Jürgen Hofmann
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Patent number: 6289928Abstract: This invention provides an apparatus and method for injecting an additive directly into a polymer melt stream. The method comprises supplying a melt flow of a polymeric host material to a die assembly having a thin-plate assembly and injecting at least one additive into at least one predetermined location in a cross-section of the melt flow of the polymeric host material while the melt flow passes through the die assembly. The method achieves uniform dosing of the one or more additives in the extrusion direction in the polymeric host material without homogeneously mixing the one or more additives and the polymeric host material. The apparatus for directly injecting one or more additives into a polymer melt stream comprises a pumping system, a die assembly having a thin-plate assembly, and a distribution line.Type: GrantFiled: December 4, 1998Date of Patent: September 18, 2001Assignee: BASF CorporationInventors: Charles F. Helms, Jr., Dominick A. Burlone, James L. Huff, Thomas Kessler, Herman Brandt, Walter Gotz, Jürgen Hofmann
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Patent number: 6187825Abstract: A process for the continuous coagulation of aqueous dispersions of graft rubbers suitable for toughening thermoplastics is described. In the process, dispersions are transported through an apparatus having at least one shear element with a slotted stator and a rotating of the rotor within the stator, so that said dispersions are passed radially from the inside to the outside as a result of the rotation of the rotor in the shear element and, during or after passage through the slots of the rotor and stator, are subjected to such strong shearing that they coagulate, resulting in graft rubber coagulums which can be readily worked up even at a solids content of more than 50% by weight of elastomers.Type: GrantFiled: June 21, 1999Date of Patent: February 13, 2001Assignee: BASF AktiengesellschaftInventors: Norbert Güntherberg, Jürgen Hofmann
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Patent number: 6187877Abstract: A polymer based on a dicarboxylic acid and a diamine is prepared by polycondensation in an extruder, by (a) heating a mixture of a dicarboxylic acid having from 4 to 12 carbon atoms and a diamine having from 4 to 12 carbon atoms, which mixture is solid at room temperature and has a residual moisture content of less than 5% by weight, to a temperature in the range from 150 to 400° C. under autogenous pressure in a contrarotating twin-screw extruder to give a product A, (b) feeding the product A to a corotating twin-screw extruder, with the product A being exposed to a temperature in the range from 150 to 400° C. and residual water present and also water from the polycondensation being removed through the degassing openings, to give a product B, with the proviso that the corotating twin-screw extruder has at least two segments having different pressures.Type: GrantFiled: October 7, 1997Date of Patent: February 13, 2001Assignee: BASF AktiengesellschaftInventors: Walter Götz, Jürgen Hofmann, Michael Kopietz, Helmut Horle
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Patent number: 6183286Abstract: A lamp socket system 1 is provided for mounting an associated lamp 20, 20′ by holding a base 15 of the lamp through engagement between a set of connection pins 8, 8′ extending outwardly from the lamp base and a set of bayonet catch contacts 17, 18. The lamp socket includes a main housing body 2 and a substantially cylindrical coding ring 3, 3′ selectively connectable with the housing. The cylindrical coding ring 3 includes a set of recesses 10, 10′ arranged on an inner circumference of the coding ring at positions corresponding with positions of the set of connection pins 8, 8′ extending from the associated lamp socket base 15. The set of recesses 10, 10′ are adapted to receive the set of bayonet catch contacts 17, 18 associated with the lamp socket. A plurality of cylindrical coding rings are provided for selective connection with the main housing body to provide a convertible lamp socket system.Type: GrantFiled: February 24, 1999Date of Patent: February 6, 2001Assignee: TRW Automotive Electronics & Components GmbH & Co. KGInventor: Jürgen Hofmann
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Patent number: 6165399Abstract: A process for preparing thermoplastics or polymer blends comprising (A) from 5 to 95% of a water-moist elastomer component containing up to 60% of residual water, (B) from 5 to 95% of a thermoplastic polymer, (C) from 0 to 95% of a further polymer, and (D) from 0 to 70% of additives, said process comprising mixing the components A to D in an extruder with mechanical dewatering of component A, wherein the extruder has at least two rotating screws and, in the conveying direction, is essentially composed of a metering section into which component A is fed, a squeeze section which serves for dewatering component A and contains a retarding element and an associated dewatering orifice which is present upstream of the retarding element by a distance corresponding to at least one screw diameter, a feed section in which the thermoplastic polymer B is introduced as a melt into the extruder, a plastication section with mixing or kneading elements, a devolatilization section with an orifice and in which the remaining watType: GrantFiled: March 25, 1999Date of Patent: December 26, 2000Assignee: BASF AktiengesellschaftInventors: Norbert Guntherberg, Jurgen Hofmann, Elmar Mailahn, Hilmar Ohlig, Bernhard Czauderna, Sven Grabowski, Klaus Bus
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Patent number: 6140409Abstract: Halogen-free antidrip agents for thermoplastic molding materials contain polymers based on vinylaromatic monomers and having molecular weights (M.sub.w) of at least 800 000 g/mol and a narrow molecular weight distribution.Type: GrantFiled: January 5, 1998Date of Patent: October 31, 2000Assignee: BASF AktiengesellschaftInventors: Martin Weber, Jurgen Hofmann, Robert Weiss, Walter Heckmann, Roland Hingmann, Josef Wunsch, Graham Edmund McKee
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Patent number: 6120802Abstract: The present invention relates to a process for producing multilayer, solid drug forms for oral or rectal administration, which comprises coextrusion of at least two compositions which in each case comprise a thermoplastic, pharmacologically acceptable polymeric binder which is soluble or swellable in a physiological environment, and at least one of which contains a pharmaceutical active ingredient, and shaping the coextruded multilayer material to the required drug form.Type: GrantFiled: April 15, 1998Date of Patent: September 19, 2000Assignee: BASF AktiengesellschaftInventors: Jorg Breitenbach, Axel Paul Hartl, Jurgen Hofmann, Joerg Rosenberg, Michael Schiessl, Hans Dieter Zettler
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Patent number: 6121391Abstract: Polymers of vinylaromatic compounds are prepared at from -80 to 150.degree. C. in the presence of metallocene catalyst systems by a process in which polymerization is carried out in one stage with the use of a closely intermeshing twin-screw extruder having corotating screws.Type: GrantFiled: June 2, 1998Date of Patent: September 19, 2000Assignee: BASF AktiengesellschaftInventors: Josef Wunsch, Jurgen Hofmann, Thomas Kessler, David Fischer
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Patent number: 6111058Abstract: Biodegradable polyesteramides as defined in the specification obtained by reacting a mixture consisting essentially of(a1) from 95 to 99.9% by weight of a polyesteramide,(a2) from 0.1 to 5% by weight of a divinyl ether, and(a3) from 0 to 5 mol % of compound D as defined in the specification, and other biodegradable polymers and thermoplastic molding compositions, processes for the preparation thereof, the use thereof for producing biodegradable moldings, and adhesives, biodegradable moldings obtained from the polymers and molding compositions according to the invention.Type: GrantFiled: July 3, 1997Date of Patent: August 29, 2000Assignee: BASF AktiengesellschaftInventors: Volker Warzelhan, Matthias Kroner, Jurgen Hofmann, Ursula Seeliger, Motonori Yamamoto, Peter Bauer
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Patent number: 6048951Abstract: Process for preparing copolymers of aromatic vinyl compounds at -80 to 150.degree. C. in the presence of metallocene catalyst systems using a corotating, closely intermeshing twin-screw extruder for polymerization.Type: GrantFiled: June 2, 1998Date of Patent: April 11, 2000Assignee: BASF AktiengesellschaftInventors: Josef Wunsch, Jurgen Hofmann, Thomas Kessler
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Patent number: 5958316Abstract: Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 50% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in a mixing unit, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating screws and essentially includes, in the transport direction,one unheated metering section in which the elastomer component A is fed to the extruder by a metering means,at least one unheated squeeze section which serves for dewatering and contains at least one retarding element and in each case at least one associated dewatering orifice,at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder,at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements,at least one devolatilization section which is provided with at least one devolatilization orifice and in whichType: GrantFiled: March 22, 1996Date of Patent: September 28, 1999Assignee: BASF AktiengesellschaftInventors: Norbert Guntherberg, Jurgen Hofmann, Hilmar Ohlig, Elmar Mailahn, Klaus Bus, Bernhard Czauderna, Sven Grabowski
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Patent number: 5910276Abstract: Toughened thermoplastics are prepared by mechanically dewatering a water-moist elastomer component A containing up to 60% by weight of residual water and mixing the resulting dewatered elastomer component A' with a thermoplastic polymer B in an extruder, by a process in which the elastomer component A is fed to a twin-screw extruder which has corotating, in each case double-flight, screws and essentially includes, in the transport direction,a metering section in which the elastomer component A is fed to the extruder by a metering means,at least one squeeze section which serves for dewatering and contains at least one retarding element and in each case at least one associated dewatering orifice,at least one section provided with a conveying screw or at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements,at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder,at least one section provided with mixing, kneadType: GrantFiled: March 22, 1996Date of Patent: June 8, 1999Assignee: BASF AktiengesellschaftInventors: Norbert Guntherberg, Jurgen Hofmann, Hilmar Ohlig, Elmar Mailahn, Klaus Bus, Bernhard Czauderna, Sven Grabowski
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Patent number: 5881751Abstract: A method and an apparatus for removing residues from an inner wall surface of a liquid-filled vessel includes a submergible carrier unit drivable in liquid; a coaxial, multi-pole electrode system mounted on the carrier unit; an arrangement for steering the carrier unit to a desired location at the wall surface; and a high-power pulse generator connected with the electrode system for generating a shock wave to be applied to the wall surface at the desired location, whereby the push-pull effect of the forces derived from the shock wave causes the residues to loosen and drop off the wall surface.Type: GrantFiled: February 3, 1997Date of Patent: March 16, 1999Assignees: TZN Forschungs- und Entwicklungs-zentrum Unterluss, Telerob Ges. fur Fernhantierungs-technik GmbHInventors: Jurgen Hofmann, Bernd Birkicht
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Patent number: 5855325Abstract: A method of separating glass from film in a recycling of laminated panes, includes the following consecutive steps: in a crusher, breaking the glass carried on the film; heating the broken panes in a heating bath; and removing the glass from the film in a separating device.Type: GrantFiled: March 3, 1997Date of Patent: January 5, 1999Assignee: TZN Forschungs-undInventors: Jurgen Hofmann, Hans-Otto Demski
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Patent number: 5852113Abstract: Toughened thermoplastics are prepared by mixing a water-moist elastomer component A containing up to 60% by weight of residual water with a thermoplastic polymer B and further polymers C and additives D in an extruder with mechanical dewatering of the elastomer component A, by a process in which the components A, B, C and D are fed to a twin-screw extruder which has corotating screws and essentially comprises, in the transport direction,at least one metering section in which the elastomer component A is fed to the extruder by a metering means,at least one squeeze section which serves for dewatering the component A and contains at least one retarding element and in each case at least one associated dewatering orifice,at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder,at least one section provided with mixing, kneading or other plasticating elements or combinations of these elements,at least one devolatilization section which is provided with at least one devolatType: GrantFiled: March 22, 1996Date of Patent: December 22, 1998Assignee: BASF AktiengesellschaftInventors: Norbert Guntherberg, Jurgen Hofmann, Elmar Mailahn, Hilmar Ohlig, Sven Grabowski, Bernhard Czauderna, Klaus Bus