Patents by Inventor Thomas Kehr
Thomas Kehr 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: 8686181Abstract: The present invention relates to a process for preparing ethylene glycol dimethacrylate, which comprises transesterification of ethylene glycol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising lithium amide (LiNH2) and lithium chloride (LiCl) is used as catalyst. The process of the invention makes it possible to prepare ethylene glycol dimethacrylate particularly inexpensively and in a very high purity.Type: GrantFiled: May 8, 2008Date of Patent: April 1, 2014Assignee: Evonik Roehm GmbHInventors: Joachim Knebel, Thorben Schuetz, Guido Protzmann, Harald Trauthwein, Guenther Lauster, Thomas Kehr, Gerhard Koelbl, Guenter Westhaeuser
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Patent number: 8674133Abstract: The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl(meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.Type: GrantFiled: March 3, 2010Date of Patent: March 18, 2014Assignee: Evonik Röhm GmbHInventors: Bardo Schmitt, Wolfgang Klesse, Martina Ebert, Dirk Broell, Guido Protzmann, Joachim Knebel, Thomas Kehr, Hans-Gerhard Stadler, Gerhard Koelbl, Benedikt Laux
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Publication number: 20130172598Abstract: The present invention relates to a process for preparing ethylene glycol dimethacrylate, which comprises transesterification of ethylene glycol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising lithium amide (LiNH2) and lithium chloride (LiCl) is used as catalyst. The process of the invention makes it possible to prepare ethylene glycol dimethacrylate particularly inexpensively and in a very high purity.Type: ApplicationFiled: May 8, 2008Publication date: July 4, 2013Applicant: Evonik Roehm GmbHInventors: Joachim Knebel, Thorben Schuetz, Guido Protzmann, Harald Trauthwein, Guenther Lauster, Thomas Kehr, Gerhard Koelbl, Guenter Westhaeuser
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Patent number: 8129563Abstract: The present invention relates to a process for preparing allyl methacrylate, comprising the reaction of allyl alcohol with an ester of methacrylic acid, wherein the reaction is catalyzed by zirconium acetylacetonate. The process according to the invention enables particularly favorable preparation of allyl methacrylate with a very high purity.Type: GrantFiled: May 8, 2008Date of Patent: March 6, 2012Assignee: Evonik Roehm GmbHInventors: Bardo Schmitt, Guido Protzmann, Thorben Schuetz, Harald Trauthwein, Reinhold Martin, Joachim Knebel, Ingo Sander, Klaus Gottmann, Thomas Kehr, Dieter Bathen, Christian Maul
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Publication number: 20110313195Abstract: The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl (meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.Type: ApplicationFiled: March 3, 2010Publication date: December 22, 2011Inventors: Bardo Schmitt, Wolfgang Klesse, Martina Ebert, Dirk Broell, Guido Protzmann, Joachim Knebel, Thomas Kehr, Hans-Gerhard Stadler, Gerhard Koelbl, Benedikt Laux
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Patent number: 8049030Abstract: The present invention relates to a process for preparing (meth)acrylates, which comprises the transesterification of an alcohol with a low-boiling ester of (meth)acrylic acid in the presence of catalysts, with the alcohol liberated from the low-boiling ester of (meth)acrylic acid being separated off by distillation, characterized in that the molar ratio of low-boiling ester of (meth)acrylic acid to starting alcohol present in the reaction mixture is increased during the reaction by addition of low-boiling ester of (meth)acrylic acid. The process of the invention makes a particularly inexpensive preparation of (meth)acrylates having a very high purity possible.Type: GrantFiled: May 8, 2008Date of Patent: November 1, 2011Assignee: Evonik Röhm GmbHInventors: Guido Protzmann, Harald Trauthwein, Joachim Knebel, Thorben Schuetz, Gerhard Koelbl, Thomas Kehr, Guenther Lauster
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Patent number: 8039664Abstract: The present invention relates to a process for preparing butanediol dimethacrylates, which comprises the transesterification of butanediol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising at least one lithium compound and at least one calcium compound is used as catalyst, at least one of the compounds of lithium and/or of calcium is an oxide, a hydroxide, an alkoxide having from 1 to 4 carbon atoms or a carboxylate having from 1 to 4 carbon atoms and at least part of the reaction is carried out in the presence of an effective amount of water. The process of the invention makes a particularly inexpensive preparation of butanediol dimethacrylates having a very high purity possible.Type: GrantFiled: May 8, 2008Date of Patent: October 18, 2011Assignee: Evonik Roehm GmbHInventors: Joachim Knebel, Thorben Schuetz, Harald Trauthwein, Thomas Kehr, Guenther Lauster, Guido Protzmann, Gerhard Koelbl, Guenter Westhaeuser
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Publication number: 20100204509Abstract: The present invention relates to a process for preparing (meth)acrylates, which comprises the transesterification of an alcohol with a low-boiling ester of (meth)acrylic acid in the presence of catalysts, with the alcohol liberated from the low-boiling ester of (meth)acrylic acid being separated off by distillation, characterized in that the molar ratio of low-boiling ester of (meth)acrylic acid to starting alcohol present in the reaction mixture is increased during the reaction by addition of low-boiling ester of (meth)acrylic acid. The process of the invention makes a particularly inexpensive preparation of (meth)acrylates having a very high purity possible.Type: ApplicationFiled: May 8, 2008Publication date: August 12, 2010Applicant: EVONIK ROEHM GMBHInventors: Guido Protzmann, Harald Trauthwein, Joachim Knebel, Thorben Schuetz, Gerhard Koelbl, Thomas Kehr, Guenther Lauster
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Publication number: 20100197955Abstract: The present invention relates to a process for preparing butanediol dimethacrylates, which comprises the transesterification of butanediol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising at least one lithium compound and at least one calcium compound is used as catalyst, at least one of the compounds of lithium and/or of calcium is an oxide, a hydroxide, an alkoxide having from 1 to 4 carbon atoms or a carboxylate having from 1 to 4 carbon atoms and at least part of the reaction is carried out in the presence of an effective amount of water. The process of the invention makes a particularly inexpensive preparation of butanediol dimethacrylates having a very high purity possible.Type: ApplicationFiled: May 8, 2008Publication date: August 5, 2010Applicant: Evonik Roehm GMBHInventors: Joachim Knebel, Thorben Schuetz, Harald Trauthwein, Thomas Kehr, Guenther Lauster, Guido Protzmann, Gerhard Koelbl, Guenter Westhaeuser
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Publication number: 20100185009Abstract: The present invention relates to a process for preparing allyl methacrylate, comprising the reaction of allyl alcohol with an ester of methacrylic acid, wherein the reaction is catalysed by zirconium acetylacetonate. The process according to the invention enables particularly favourable preparation of allyl methacrylate with a very high purity.Type: ApplicationFiled: May 8, 2008Publication date: July 22, 2010Applicant: Evonik Roehm GmbHInventors: Bardo Schmitt, Guido Protzmann, Thorben Schuetz, Harald Trauthwein, Reinhold Martin, Joachim Knebel, Ingo Sander, Klaus Gottmann, Thomas Kehr, Dieter Bathen, Christian Maul
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Patent number: 5849946Abstract: The invention relates to a method of obtaining water-free 2-trimethylammoniumethyl methacrylate chloride (TMAC) characterized in that an aqueous TMAC solution is subjected to the following operations:(a) Azeotropic removal using an alkyl (meth)acrylate; and(b) Filtration of the resulting suspension.Type: GrantFiled: May 16, 1997Date of Patent: December 15, 1998Assignee: Roehm GmbH Chemische FabrikInventors: Peter-Joseph Arndt, Werner Ude, Klaus Gottmann, Thomas Kehr