Patents by Inventor Gunter Kolbe
Gunter Kolbe 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: 6770779Abstract: The present invention relates to a process for the preparation of alkylphosphonous acid esters which comprises a) reacting elemental yellow phosphorus with alkylating agents in the presence of a base to give a mixture which comprises, as principal constituents, the (metal) salts of alkylphosphonous, phosphorous and hypophosphorous acids, b) esterifying the principal constituents of the mixture from a) to give an ester mixture, c) isolating the ester of the alkylphosphonous acid from the ester mixture. The invention likewise relates to the use of the alkylphosphonous acid esters prepared by this process as precursors for further syntheses, inter alia for the preparation of crop protection agents.Type: GrantFiled: May 24, 2000Date of Patent: August 3, 2004Assignee: Clariant GmbHInventors: Norbert Weferling, Martin Sicken, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6534673Abstract: The invention relates to a process for preparing salts of dialkylphosphinic acids, which comprises a) reacting alkylphosphonous and/or hypo- phosphorous acid and/or alkali metal salts thereof with olefins in the presence of a free-radical initiator to give dialkylphosphinic acids and/or alkali metal salts thereof and b) reacting the dialkylphosphinic acids and/or alkali metal salts thereof obtained according to a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkyl20 phosphinate salts.Type: GrantFiled: November 24, 1998Date of Patent: March 18, 2003Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6359171Abstract: The invention relates to a process for the preparation of dialkylphosphinic acids and salts thereof, which comprises a) reacting elemental yellow phosphorus with alkylating agents in the presence of a base to give a mixture which comprises, as principal constituents, the (metal) salts of alkylphosphonous, phosphorous and hypophosphorous acids, b) esterifying the principal constituents of the mixture from a) to give an ester mixture, c) isolating the ester of the alkylphosphonous acid from the ester mixture, d) preparing the corresponding ester of the dialkylphosphinic acid from the ester of the alkylphosphonous acid by free-radical-initiated reaction with olefins, e) converting the ester of the dialkylphosphinic acid into the free acid or into the dialkylphosphinic acid salts of metals from groups IA, IIA, IIIA, IVA, VA, IIB, IVB, VIIB or VIIIB of the Periodic Table or of cerium.Type: GrantFiled: May 24, 2000Date of Patent: March 19, 2002Assignee: Clariant GmbHInventors: Norbert Weferling, Martin Sicken, Günter Kolbe, Hans-Peter Schmitz
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Patent number: 6355832Abstract: The invention relates to a process for preparing salts of dialkylphosphinic acids, which comprises a) reacting alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof with olefins in the presence of a free-radical initiator to give dialkylphosphinic acids and/or alkali metal salts thereof and b) reacting the dialkylphosphinic acids and/or alkali metal salts thereof obtained according to a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkylphosphinate salts. The invention likewise relates to the use of the metal dialkylphosphinate salts prepared by the process according to the invention for preparing flame retardants.Type: GrantFiled: March 10, 2000Date of Patent: March 12, 2002Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6329544Abstract: The invention relates to a process for preparing dialkylphosphinic acids and/or alkali metal salts thereof by reacting olefins with alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof, which comprises carrying out the reaction in the presence of a azo free-radical initiator. The invention also relates to the use of the products prepared by the abovementioned process for preparing flame retardants.Type: GrantFiled: March 10, 2000Date of Patent: December 11, 2001Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6300516Abstract: The invention relates to a process for preparing dialkylphosphinic acids and/or alkali metal salts thereof by reacting olefins with alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof, which comprises carrying out the reaction in the presence of a free-radical initiator. The invention also relates to the use of the products prepared by the abovementioned process for preparing flame retardants.Type: GrantFiled: November 24, 1998Date of Patent: October 9, 2001Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6248921Abstract: The invention relates to a process for preparing salts of dialkylphosphinic acids, which comprises a) reacting alkylphosphonous and/or hypophosphorous acid and/or alkali metal salts thereof with olefins in the presence of a free-radical initiator to give dialkylphosphinic acids and/or alkali metal salts thereof and b) reacting the dialkylphosphinic acids and/or alkali metal salts thereof obtained according to a) with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkylphosphinate salts. The invention likewise relates to the use of the metal dialkylphosphinate salts prepared by the process according to the invention for preparing flame retardants.Type: GrantFiled: November 24, 1998Date of Patent: June 19, 2001Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Günter Kolbe
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Patent number: 6011172Abstract: The invention relates to a process for preparing alkali metal salts and/or alkaline earth metal salts of alkylphosphonous acids and dialkylphosphinic acids from elemental yellow phosphorus and alkyl halides, which comprises carrying out the reaction in the presence of aqueous alkali metal hydroxide or alkaline earth metal hydroxide or mixtures thereof. The invention likewise relates to the use of the compounds prepared by the process according to the invention for preparing flame retardants, extraction media and plant protection agents.Type: GrantFiled: November 24, 1998Date of Patent: January 4, 2000Assignee: Clariant GmbHInventors: Norbert Weferling, Othmar Stelzer, Gunter Kolbe
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Patent number: 5973194Abstract: The invention relates to a process for preparing dialkylphosphinate salts, which comprisesa) reacting elemental yellow phosphorus with alkyl halides in the presence of alkali metal hydroxide or alkaline earth metal hydroxide to form a mixture which comprises as main constituents the salts of alkylphosphonous, phosphorous and hypophosphorous acids,b) adjusting the mixture to a pH below 7 and then reacting the mixture with olefins in the presence of a free-radical initiator andc) reacting the dialkylphosphinic acids obtained according to b) and/or alkali metal salts thereof with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K to give the metal dialkylphosphinate salts.The invention likewise relates to the use of the metal dialkylphosphinate salts prepared by the process according to the invention to prepare flame retardants.Type: GrantFiled: November 24, 1998Date of Patent: October 26, 1999Assignee: Clariant GmbHInventors: Norbert Weferling, Hans-Peter Schmitz, Gunter Kolbe
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Patent number: 4665910Abstract: A respirator with regeneration of the respiratory air includes, for the cooling of the inhalation air, a chemical cartridge regenerating the respiratory air which has an area cooler located in the respiratory air stream, which cooler is arranged adjacent to and spaced from the surface of the chemical cartridge.Type: GrantFiled: November 5, 1985Date of Patent: May 19, 1987Assignee: Dragerwerk AGInventors: Ernst-Gunter Kolbe, Hasso Weinmann, Wolfgang Drews, Wolfgang Eckstein