Patents by Inventor Herbert Vorholt
Herbert Vorholt 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: 10377057Abstract: The invention relates generally to a process for the preparation of water-absorbent polymer particles, comprising the process steps including of drying the polymer gel particles wherein in process step (viii) the gel particles obtained in process step (vii) are charged onto the surface of the belt material of a belt dryer at a position L0 and are subsequently dried on their way through the belt dryer and wherein the belt material has been cooled before coming into contact with the gel particles. The invention also relates to water-absorbent polymer particles obtainable by such a process.Type: GrantFiled: December 13, 2012Date of Patent: August 13, 2019Assignee: Evonik Degussa GmbHInventors: Herbert Vorholt, Henry Rudolph, Armin Reimann, Volker Becker, Detlef Jung, Manfred van Stiphoudt
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Publication number: 20150017426Abstract: The invention relates to a process for the preparation of water-absorbent polymer particles, comprising the process steps of preparing an aqueous monomer solution comprising at least partially neutralized, monoethylenically unsaturated monomers bearing carboxylic acid groups (?1) and at least one crosslinker (?3), and at least partially neutralizing acrylic acid by mixing acrylic acid with an aqueous solution of sodium hydroxide, thereby obtaining an aqueous solution of the at least partially neutralized acrylic acid; cooling the aqueous solution with a cooling liquid in a heat exchanger, wherein the cooling liquid used in the heat exchanger has been cooled in an absorption chiller in which at least a part of the heat of the heated cooling liquid obtained in the heat exchanger is consumed by the evaporation of a refrigerant liquid in a vacuum that is created by the absorption of a refrigerant vapor into an absorbent.Type: ApplicationFiled: December 13, 2012Publication date: January 15, 2015Applicant: EVONIK DEGUSSA GMBHInventors: Herbert Vorholt, Henry Rudolph, Manfred van Stiphoudt, Armin Reimann, Detlef Jung, Martin W. Beerhorst, Heinz-Peter Grupe, Volker Becker
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Publication number: 20140377538Abstract: The invention relates generally to a process for the preparation of water-absorbent polymer particles, comprising the process steps including of drying the polymer gel particles wherein in process step (viii) the gel particles obtained in process step (vii) are charged onto the surface of the belt material of a belt dryer at a position L0 and are subsequently dried on their way through the belt dryer and wherein the belt material has been cooled before coming into contact with the gel particles. The invention also relates to water-absorbent polymer particles obtainable by such a process.Type: ApplicationFiled: December 13, 2012Publication date: December 25, 2014Applicant: EVONIK DEGUSSA GMBHInventors: Herbert Vorholt, Henry Rudolph, Armin Reimann, Volker Becker, Detlef Jung, Manfred van Stiphoudt
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Patent number: 8349913Abstract: The present invention relates to a process for the production of a superabsorber, comprising as steps providing a water-absorbing polymer structure, bringing the water-absorbing polymer structure into contact with a modifying agent, preferably a modifying agent, and the further treatment of the water-absorbing polymer structure which has been brought into contact with the modifying agent. The further treatment is carried out at least partly in a rotating container. The invention furthermore relates to a device for the production of a superabsorber, superabsorbers, a composite, a process for the production of a composite, the composites obtainable by this process, chemical products, such as foams, shaped articles or fibers, and the use of a superabsorber.Type: GrantFiled: May 21, 2008Date of Patent: January 8, 2013Assignee: Evonik Stockhausen GmbHInventors: Jörg Harren, Herbert Vorholt, Manfred Van Stiphoudt, Rüdiger Hose, Stephan Ramlow, Stefan Derstappen, Axel Busch, Michael Lange, Waldemar Inger, Kai Hebben
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Patent number: 7893134Abstract: A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.Type: GrantFiled: April 27, 2009Date of Patent: February 22, 2011Assignee: Evonik Stockhausen GmbHInventors: Armin Reimann, Manfred Van Stiphoudt, Herbert Vorholt
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Publication number: 20100130950Abstract: The present invention relates to a process for the production of a superabsorber, comprising as steps providing a water-absorbing polymer structure, bringing the water-absorbing polymer structure into contact with a modifying agent, preferably a modifying agent, and the further treatment of the water-absorbing polymer structure which has been brought into contact with the modifying agent. The further treatment is carried out at least partly in a rotating container. The invention furthermore relates to a device for the production of a superabsorber, superabsorbers, a composite, a process for the production of a composite, the composites obtainable by this process, chemical products, such as foams, shaped articles or fibers, and the use of a superabsorber.Type: ApplicationFiled: May 21, 2008Publication date: May 27, 2010Inventors: Jörg Harren, Herbert Vorholt, Manfred Van Stiphoudt, Rüdiger Hose, Stephan Ramlow, Stefan Derstappen, Axel Busch, Michael Lange, Waldemar Inger, Kal Hebben
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Publication number: 20090209683Abstract: A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.Type: ApplicationFiled: April 27, 2009Publication date: August 20, 2009Inventors: Armin Reimann, Manfred Van Stiphoudt, Herbert Vorholt
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Patent number: 7541395Abstract: A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.Type: GrantFiled: October 24, 2003Date of Patent: June 2, 2009Assignee: Evonik Stockhausen GmbHInventors: Armin Reimann, Manfred Van Stiphoudt, Herbert Vorholt
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Publication number: 20060057389Abstract: A process for producing an absorbent polymer including a first mixing event, in which a plurality of absorbent polymer particles (1) are mixed with a liquid (2) and a second mixing event, in which the liquid (2) is homogenized within the interior of the polymer particles. The polymer particles (1) in the first mixing event are mixed with a speed such that the kinetic energy of the individual polymer particles (1) is on average larger than the adhesion energy of the individual polymer particles (1), and the polymer particles (1) in the second mixing event are stirred at a lower speed than in the first mixing event. The different speeds effect a fluidization of the polymer particles (1), which prevents a clumping of the polymer particles (1) during the mixing event. The absorbent polymers thus produced are distinguished by a particularly rapid swelling behavior.Type: ApplicationFiled: October 24, 2003Publication date: March 16, 2006Inventors: Armin Reimann, Manfred Van Stiphoudt, Herbert Vorholt
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Patent number: 6841595Abstract: Process for the preparation of protective colloid-stabilized, emulsifier-free, aqueous dispersions based on at least two monomers selected from vinylaromatics, 1,3-dienes and/or (meth)acrylates, in the presence of assistants and, if required, further comonomers in an amount of from 0.1% by weight to 20% by weight, based on the total amount of monomers, wherein at least 10% by weight of the total amount of water are added to the reaction vessel only after the monomers have been added to the reaction vessel and the conversion is at least 40%, based on 100% of the monomers.Type: GrantFiled: July 3, 2002Date of Patent: January 11, 2005Assignee: PolymerLatex GmbH & Co. KGInventors: Davide Brizzolara, Herbert Vorholt
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Publication number: 20030022976Abstract: Process for the preparation of protective colloid-stabilized, emulsifier-free, aqueous dispersions based on at least two monomers selected from vinylaromatics, 1,3-dienes and/or (meth)acrylates, in the presence of assistants and, if required, further comonomers in an amount of from 0.1% by weight to 20% by weight, based on the total amount of monomers, wherein at least 10% by weight of the total amount of water are added to the reaction vessel only after the monomers have been added to the reaction vessel and the conversion is at least 40%, based on 100% of the monomers.Type: ApplicationFiled: July 3, 2002Publication date: January 30, 2003Applicant: POLYMERLATEX GmbH & Co. KGInventors: Davide Brizzolara, Herbert Vorholt