Patents by Inventor Christopher Barner-Kowollik
Christopher Barner-Kowollik 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: 10875949Abstract: The present invention relates to polymerizable and photochemically crosslinkable compositions which contain at least one polymerizable benzaldehyde derivative according to general formula I and which are suitable as materials for technical and medical applications, for example in surgery or ophthalmology, and in particular as dental materials.Type: GrantFiled: August 23, 2019Date of Patent: December 29, 2020Assignee: Ivoclar Vivadent AGInventors: Norbert Moszner, John Hendrik, Iris Lamparth, Christopher Barner-Kowollik, Tim Krappitz, Florian Feist
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Publication number: 20200079888Abstract: The present invention relates to polymerizable and photochemically crosslinkable compositions which contain at least one polymerizable benzaldehyde derivative according to general formula I and which are suitable as materials for technical and medical applications, for example in surgery or ophthalmology, and in particular as dental materials.Type: ApplicationFiled: August 23, 2019Publication date: March 12, 2020Inventors: Norbert Moszner, John Hendrik, Iris Lamparth, Christopher Barner-Kowollik, Tim Krappitz, Fiorian Feist
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Publication number: 20190016676Abstract: The invention relates to a novel hetero-Diels-Alder crosslinker, to a process for the production thereof and to the use thereof for reversibly crosslinking polymer systems.Type: ApplicationFiled: January 20, 2017Publication date: January 17, 2019Applicant: Evonik Degussa GmbHInventors: Friedrich Georg SCHMIDT, Uwe PAULMANN, Christian RICHTER, Marcel INHESTERN, Christian MEIER, Christopher BARNER-KOWOLLIK, Kai PAHNKE, Miguel Angel SANZ, Sumaira UMBREEN, Christian Ewald JANSSEN
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Patent number: 10030105Abstract: The invention relates to low molecular mass products and to the use thereof as reversible or permanent low-temperature crosslinkers in Diels-Alder reactions.Type: GrantFiled: June 29, 2012Date of Patent: July 24, 2018Assignee: Evonik Degussa GmbHInventors: Friedrich Georg Schmidt, Stefan Hilf, Emmanouil Spyrou, Jiawen Zhou, Nathalie Guimard, Christopher Barner-Kowollik, Kim Klaus Oehlenschlaeger, Andre Hennig
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Publication number: 20180149972Abstract: Disclosed is a method of conducting chemical reactions below the diffraction limit. The method comprises providing a composition comprising or consisting of at least one photoenol, initiating a reaction which emanates from the photoenol at a selected site by irradiation with light of a first, photoenol-activating wavelength, and concurrently or thereafter, suppressing the reaction emanating from the photoenol in the immediate vicinity of the selected site by irradiation with light of a second, photoenol-deactivating wavelength which creates an interference pattern having an intensity minimum or zero intensity at the selected site.Type: ApplicationFiled: May 23, 2016Publication date: May 31, 2018Inventors: Joachim FISCHER, Benjamin RICHTER, Alexander QUICK, Jonathan MUELLER, Martin BASTMEYER, Christopher BARNER-KOWOLLIK, Martin WEGENER
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Patent number: 9550851Abstract: A method for the reversible crosslinking of, for example, adhesives or coating materials, and a composition stable on storage at room temperature for implementing the crosslinking reaction. The reversible crosslinking method allows very rapid crosslinking even at a low first temperature, and undoing of the crosslinks at higher temperatures, thereby recovering thermoplastic processability and, for example, allowing the originally bonded substrates to be parted from one another again easily. A particular aspect is that a plurality of cycles of crosslinking and undoing of the crosslinks are possible with the present system. A feature of the system used for the reversible crosslinking is that it contains two components, A and B, where component A is a compound having at least two protected dithioester functionalities, preferably cyanodithioester functionalities, and component B is a compound having at least two diene functionalities.Type: GrantFiled: November 11, 2013Date of Patent: January 24, 2017Assignee: EVONIK ROEHM GmbHInventors: Christopher Barner-Kowollik, Kim Klaus Oehlenschlaeger, Stefan Hilf, Friedrich Georg Schmidt, Nathalie Guimard, Jan Mueller
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Publication number: 20160251300Abstract: Photoreactive monomer which has (i) at least one free-radically polymerizable C—C double bond, (ii) at least one hydrophilic group selected from an ethylene glycol group and a polyethylene glycol group having at least 2 ethylene glycol units and (iii) at least one photoreactive group, the photoreactive group being a photoenolizable carbonyl group, and also a method for preparing the photoreactive monomers.Type: ApplicationFiled: February 23, 2016Publication date: September 1, 2016Applicant: BASF SEInventors: Dieter URBAN, Ulrike LICHT, Christopher BARNER-KOWOLLIK, Guillaume DELAITTRE, Elena FRICK
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Patent number: 9315445Abstract: Photoreactive monomer which has (i) at least one free-radically polymerizable C—C double bond, (ii) at least one hydrophilic group selected from an ethylene glycol group and a polyethylene glycol group having at least 2 ethylene glycol units and (iii) at least one photoreactive group, the photoreactive group being a photoenolizable carbonyl group, and also a method for preparing the photoreactive monomers.Type: GrantFiled: September 9, 2013Date of Patent: April 19, 2016Assignee: BASF SEInventors: Dieter Urban, Ulrike Licht, Christopher Barner-Kowollik, Guillaume Delaittre, Elena Frick
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Publication number: 20150299363Abstract: The present invention relates to an innovative method for the reversible crosslinking of, for example, adhesives or coating materials, and to a composition stable on storage at room temperature for implementing this crosslinking reaction. The reversible crosslinking method allows very rapid crosslinking even at a low first temperature, and undoing of the crosslinks at higher temperatures, thereby recovering thermoplastic processability and, for example, allowing the originally bonded substrates to be parted from one another again easily. A particular aspect here is that a plurality of cycles of crosslinking and undoing of the crosslinks are possible with the present system. A feature of the system used for the reversible crosslinking is that it consists of two components, A and B, in which component A is a compound comprising at least two protected dithioester functionalities, preferably cyanodithioester functionalities, and component B is a compound having at least two diene functionalities.Type: ApplicationFiled: November 11, 2013Publication date: October 22, 2015Applicant: Evonik Roehm GmbHInventors: Christopher BARNER-KOWOLLIK, Kim Klaus OEHLENSCHLAEGER, Stefan HILF, Friedrich Georg SCHMIDT, Nathalie GUIMARD, Jan MUELLER
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Patent number: 9034938Abstract: A description is given of a photoreactive polymer preparable by radical polymerization using at least one photoreactive monomer, where the photoreactive monomer has at least one radically polymerizable C—C double bond, at least one hydrophilic group selected from an ethylene glycol group and polyethylene glycol groups having at least 2 ethylene glycol units, and at least one photoreactive group, the photoreactive group being a photoenolizable carbonyl group.Type: GrantFiled: September 9, 2013Date of Patent: May 19, 2015Assignee: BASF SEInventors: Dieter Urban, Ulrike Licht, Theo Smit, Christopher Barner-Kowollik, Guillaume Delaittre, Elena Frick
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Patent number: 9023914Abstract: A new process is provided for preparing nitrile rubbers by free-radical polymerization in an organic solvent and in the presence of specific modifier substances. This polymerization may be followed by hydrogenation to give likewise new hydrogenated nitrile rubbers, the hydrogenation advantageously taking place likewise in organic solvent. The optionally hydrogenated nitrile rubbers obtained are notable for having fragments of the employed modifier substances in the main polymer chain and/or as end groups. They can be prepared with a wide diversity of molecular weights and polydispersity indices, especially with very low polydispersity indices.Type: GrantFiled: August 31, 2010Date of Patent: May 5, 2015Assignee: LANXESS Deutschland GmbHInventors: Michael Klimpel, Sven Brandau, Uwe Westeppe, Christopher Barner-Kowollik, Andreas Kaiser
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Patent number: 8987380Abstract: The present invention relates to an innovative method for controlling the viscosity of, for example, adhesives or coating formulations. The method for controlling viscosity allows very rapid thermoplastic curing of a formulation even at room temperature and a significant reduction in the viscosity at higher temperatures, thereby regaining the capacity for simple processing and allowing, for example, the originally bonded substrates to be separated from one another again with ease. A particular aspect in this context is that a plurality of cycles of thermoplastic curing and a significant reduction in the viscosity are possible with the present system.Type: GrantFiled: January 4, 2011Date of Patent: March 24, 2015Assignee: Evonik Roehm GmbHInventors: Stefan Hilf, Friedrich Georg Schmidt, Andre Hennig, Simon Krause, Christopher Barner-Kowollik, Andrew John Inglis, Leena Nebhani
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Patent number: 8981010Abstract: The invention relates to the use of a powder made of a polymer, which of two or more components with functionalities suitable for Diels-Alder reactions, or of a powder mixture (dry blend) made of powders respectively of at least one of the reactive components, where these together enter into the Diels-Alder reaction with one another and are capable of a retro-Diels-Alder reaction, in a rapid-prototyping process. The invention further relates to moldings produced with use of said polymer powder through a layer-by-layer shaping process in which regions of a powder layer are melted selectively. The molding here can be removed from the powder bed after cooling and hardening of the regions previously melted layer-by-layer.Type: GrantFiled: June 5, 2012Date of Patent: March 17, 2015Assignee: Evonik Roehm GmbHInventors: Friedrich Georg Schmidt, Stefan Hilf, Jiawen Zhou, Nathalie Guimard, Christopher Barner-Kowollik, Kim Klaus Oehlenschlaeger
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Patent number: 8980999Abstract: The present invention relates to innovative materials which are reversibly crosslinkable by means of a thermoreversible mechanism and/or whose viscosity is reversibly adjustable. Through the use of bishydrazones or conjugated bis-Schiff bases as diene components in aza-Diels-Alder reactions, functional materials are generated that feature controllable viscosity and/or reversible crosslinking.Type: GrantFiled: July 27, 2011Date of Patent: March 17, 2015Assignee: Evonik Röhm GmbHInventors: Friedrich Georg Schmidt, Stefan Hilf, Christopher Barner-Kowollik, Jiawen Zhou
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Patent number: 8969467Abstract: The present invention relates to innovative materials which can be crosslinked by means of two different crosslinking mechanisms, the first crosslinking mechanism being an irreversible crosslinking. The second crosslinking mechanism is a thermoreversible mechanism. As a result of this thermoreversible change in the arc length, properties of the crosslinked material can be decisively changed and controlled, including flexibility, elasticity and other mechanical properties, but also chemical properties, the gas permeability and vapor permeability and storage capacity of the network. In this way it would be possible, for example, to store energy sources such as fuels.Type: GrantFiled: October 12, 2011Date of Patent: March 3, 2015Assignee: Evonik Roehm GmbHInventors: Stefan Hilf, Friedrich Georg Schmidt, Christopher Barner-Kowollik, Jiawen Zhou
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Patent number: 8916635Abstract: The present invention relates to an innovative method for the reversible crosslinking of, for example, adhesives or coating materials. The reversible crosslinking method allows very rapid crosslinking even at room temperature and undoing of the crosslinks at higher temperatures, thereby regaining the capacity for thermoplastic processing and allowing the originally bonded substrates to be separated from one another again with ease. A particular aspect in this context is that a plurality of cycles of crosslinking and undoing of the crosslinks are possible with the present system.Type: GrantFiled: January 4, 2011Date of Patent: December 23, 2014Assignee: Evonik Roehm GmbHInventors: Friedrich Georg Schmidt, Simon Krause, Andre Hennig, Stefan Hilf, Christopher Barner-Kowollik, Andrew John Inglis, Leena Nebhani, Ozcan Altintas
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Publication number: 20140357801Abstract: A nitrile rubber coupled via bisdihydropyrazole groups is produced by reacting a nitrile rubber which is based on conjugated dienes, ?,?-unsaturated nitriles and optionally further copolymerizable monomers as monomers, may have been hydrogenated and has covalently bonded tetrazole groups with a bifunctional ene compound in which the ene groups can each be reacted with the tetrazole groups to give dihydropyrazole groups.Type: ApplicationFiled: May 21, 2014Publication date: December 4, 2014Applicant: LANXESS Deutschland GmbHInventors: Sven BRANDAU, Andreas KAISER, Uwe WESTEPPE, Christopher BARNER-KOWOLLIK, Christoph DUERR, Paul LEDERHOSE
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Publication number: 20140323648Abstract: The present invention relates to a novel method for photoinduced crosslinking of, for example, adhesives or coating compositions. More particularly, the present invention relates to a novel, irreversible crosslinking mechanism in which it is possible to obtain, through irradiation with visible light, specific photoactive systems via photoenol reactions controlled high-reactivity diene intermediates which crosslink polymers containing double bonds by means of a Diels-Alder reaction.Type: ApplicationFiled: December 14, 2012Publication date: October 30, 2014Applicant: EVONIK INDUSTRIES AGInventors: Friedrich Georg Schmidt, Stefan Hilf, Christopher Barner-Kowollik, Nathalie Guimard, Kim Klaus Oehlenschlaeger, Jan Mueller
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Publication number: 20140235744Abstract: A novel and improved process is provided for producing nitrile rubbers through free-radical polymerization in specific solvent mixtures. The resultant nitrile rubbers can then be subjected to hydrogenation. The process features excellent time-conversion curves.Type: ApplicationFiled: August 1, 2012Publication date: August 21, 2014Applicant: LANXESS DEUTSCHLAND GMBHInventors: Sven Brandau, Andreas Kaiser, Michael Klimpel, Christopher Barner-Kowollik, Christoph Duerr, Sebastian Emmerling
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Publication number: 20140163165Abstract: The invention relates to low molecular mass products and to the use thereof as reversible or permanent low-temperature crosslinkers in Diels-Alder reactions.Type: ApplicationFiled: June 29, 2012Publication date: June 12, 2014Applicant: Evonik Degussa GmbHInventors: Friedrich Georg Schmidt, Stefan Hilf, Emmanouil Spyrou, Jiawen Zhou, Nathalie Guimard, Christopher Barner-Kowollik, Kim Klaus Oehlenschlaeger, Andre Hennig