Patents by Inventor Knut Zollner
Knut Zollner 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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Patent number: 7906609Abstract: Process for preparing polyoxymethylene copolymers (POMs) by a) polymerizing a reaction mixture comprising suitable main monomers and comonomers and also a polymerization initiator and, if appropriate, a regulator, b) adding a deactivator and c) removing the residual monomers, wherein the amount of compounds whose melting point at 1013 hPa is below 60° C. present in the reaction mixture at any point in time during the process is not more than 0.1% by weight, with the POM, the monomers, comonomers, polymerization initiators, deactivators and regulators not being included in the calculation.Type: GrantFiled: July 13, 2006Date of Patent: March 15, 2011Assignee: BASF AGInventors: Marko Blinzler, Knut Zöllner, Claudius Schwittay, Jens Assmann
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Patent number: 7863393Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.Type: GrantFiled: November 28, 2005Date of Patent: January 4, 2011Assignee: BASF AGInventors: Jens Assmann, Knut Zollner, Johannes Heinemann, Elmar Stockelmann, Achim Stammer
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Patent number: 7645822Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b) and also, if appropriate, in the presence of regulators c), followed by deactivation and discharge from the reactor, which comprises using, as deactivator (d) at least one basic compound having at least 2 amino functions of different reactivity in one molecule.Type: GrantFiled: November 5, 2005Date of Patent: January 12, 2010Assignee: BASF SEInventors: Jens Assmann, Knut Zollner
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Patent number: 7598339Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.Type: GrantFiled: May 17, 2005Date of Patent: October 6, 2009Assignee: BASF AktiengesellschaftInventors: Claudius Schwittay, Elmar Stockelmann, Johannes Heinemann, Knut Zollner, Achim Stammer
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Publication number: 20080234459Abstract: A process for preparing polyoxymethylene homopolymers or copolymers by homopolymerization or copolymerization of trioxane or additionally of suitable comonomers, in which trioxane which still comprises residual monomers is firstly prepared in a monomer plant and is degassed in one or more stages to give one or more vapor streams (13, 14) which are, if appropriate, fed to a condenser (K) in which the condensable fractions of these vapor streams are condensed to give a condensate (15) which is recycled to the polymerization reactor (P) and one or more gaseous, formaldehyde-comprising streams (16) and also a partially degassed polyoxymethylene homopolymer or copolymer (17) which is fed to an extruder (E) or kneader and is mixed with customary additives and processing aids in this to give a polymer melt (19) and extraction of a formaldehyde-comprising extruder or kneader offgas (18) from the extruder (E) or kneader, wherein the formaldehyde-comprising secondary streams (14, 16, 18) from the polymer plant are rType: ApplicationFiled: August 25, 2006Publication date: September 25, 2008Applicant: BASF SEInventors: Neven Lang, Knut Zollner, Achim Stammer, Elmar Stockelmann
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Publication number: 20080214748Abstract: Process for removing unconverted residual monomers from polyoxymethylenes, wherein a devolatilization step is carried out in an extrudate devolatilizer.Type: ApplicationFiled: March 15, 2006Publication date: September 4, 2008Applicant: BASF AktiengesellschaftInventors: Jens Assmann, Knut Zollner, Marko Blinzler, Melanie Urtel, Claudius Schwittay
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Publication number: 20080207865Abstract: Process for preparing polyoxymethylene copolymers (POMs) by a) polymerizing a reaction mixture comprising suitable main monomers and comonomers and also a polymerization initiator and, if appropriate, a regulator, b) adding a deactivator and c) removing the residual monomers, wherein the amount of compounds whose melting point at 1013 hPa is below 60° C. present in the reaction mixture at any point in time during the process is not more than 0.1% by weight, with the POM, the monomers, comonomers, polymerization initiators, deactivators and regulators not being included in the calculation.Type: ApplicationFiled: July 13, 2006Publication date: August 28, 2008Applicant: BASF Aktiengesellschaft Patents, Trademarks and LicensesInventors: Marko Blinzler, Knut Zollner, Claudius Schwittay, Jens Assmann
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Publication number: 20080167439Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.Type: ApplicationFiled: November 28, 2005Publication date: July 10, 2008Applicant: BASF AKTIENGESELLSCHAFTInventors: Jens Assmann, Knut Zollner, Johannes Heinemann, Elmar Stockelmann, Achim Stammer
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Publication number: 20080097077Abstract: A process for the preparation of polyoxymethylenes by cationic polymerization of the monomers a) in the presence of initiators b) and, if appropriate, in the presence of regulators c) and subsequent deactivation and isolation of the polymer, wherein the total amount of proton donors is less than 5000 ppm in the entire polymerization.Type: ApplicationFiled: March 15, 2006Publication date: April 24, 2008Applicant: BASF AktiengesellschaftInventors: Jens Assmann, Knut Zollner, Mark Blinzler, Melanie Urtel, Claudius Schwittay
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Publication number: 20080009594Abstract: Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b) and also, if appropriate, in the presence of regulators c), followed by deactivation and discharge from the reactor, which comprises using, as deactivator (d) at least one basic compound having at least 2 amino functions of different reactivity in one molecule.Type: ApplicationFiled: November 5, 2005Publication date: January 10, 2008Applicant: BASF AKTIENGESELLSCHAFTInventors: Jens Assmann, Knut Zollner
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Publication number: 20070191588Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.Type: ApplicationFiled: May 17, 2005Publication date: August 16, 2007Inventors: Claudius Schwittay, Elmar Stockelmann, Johannes Heinemann, Knut Zollner, Achim Stammer