Patents by Inventor Hartmut Nefzger

Hartmut Nefzger 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).

  • Publication number: 20160208080
    Abstract: The invention relates to a method for producing polyether carbonate polyols, (i) one or more alkylene oxide(s) and carbon dioxide being added to one or more H-functional starter substance(s) in the presence of a double metal cyanide catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, a reaction mixture containing the polyether carbonate polyol being obtained, characterized in that (ii) at least one component K is added to the obtained reaction mixture containing the polyether carbonate polyol, wherein component K is selected from at least one compound that contains a phosphorus-oxygen bond or a compound of phosphorus that can form one or more P—O bonds by reaction with OH-functional compounds.
    Type: Application
    Filed: July 25, 2014
    Publication date: July 21, 2016
    Inventors: Kai Laemmerhold, Jorg Hofmann, Hartmut Nefzger
  • Patent number: 9354355
    Abstract: The present invention relates to a composition comprising 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate and more than 50 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising monomeric isophorone diisocyanate and at least one oligomeric isophorone diisocyanate, and an isocyanate-reactive component selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof. It has been shown that the above mentioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Thus prepared molded articles are particularly suitable for the preparation of spectacle lenses, inter alia due to these properties.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: May 31, 2016
    Assignee: COVESTRO DEUTSCHLAND AG
    Inventors: Dorota Greszta-Franz, Hans-Josef Laas, Hartmut Nefzger, Jens Krause
  • Publication number: 20160145403
    Abstract: The invention relates to prepregs and to a method for producing storage-stable polyurethane prepregs (pre-impregnated fibers) using polyols with a high content of secondary hydroxyl end groups, to composite fiber components (composite components) which are produced from the prepregs and which can be obtained by impregnating fiber-shaped materials such as woven fabrics and fleece, and to a method for producing said composite fiber components.
    Type: Application
    Filed: April 14, 2014
    Publication date: May 26, 2016
    Inventors: Florian Hupka, Marcel SCHORNSTEIN, Hartmut NEFZGER
  • Publication number: 20160139301
    Abstract: The present invention relates to a composition comprising 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate and more than 50 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising monomeric isophorone diisocyanate and at least one oligomeric isophorone diisocyanate, and an isocyanate-reactive component selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof. It has been shown that the above mentioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Thus prepared molded articles are particularly suitable for the preparation of spectacle lenses, inter alia due to these properties.
    Type: Application
    Filed: January 28, 2016
    Publication date: May 19, 2016
    Inventors: Dorota GRESZTA-FRANZ, Hans-Josef LAAS, Hartmut NEFZGER, Jens KRAUSE
  • Patent number: 9328196
    Abstract: The present invention relates to a process for the preparation of polyricinoleic acid ester polyols having primary hydroxyl end groups. It furthermore relates to polyricinoleic acid ester polyols obtainable according to the invention and polyurethane polymers prepared using these polyols. The process comprises the steps: a) polycondensation of ricinoleic acid until a hydroxyl number of >0 mg of KOH/g to <60 mg of KOH/g is reached; and b) reaction of the product obtained in step a) or of a secondary product of the product obtained in step a) comprising carboxyl groups with an epoxide of the general formula (I), wherein R1 represents hydrogen, an alkyl radical or an aryl radical, with the proviso that >80% by weight to <100% by weight, based on the total amount of the epoxide (I) employed, is ethylene oxide and the reaction is carried out in the presence of an amine as the catalyst.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: May 3, 2016
    Assignee: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Jörg Hofmann, Erika Bauer, Bert Klesczewski, Klaus Lorenz
  • Publication number: 20160039988
    Abstract: The invention relates to a polyester polyol which contains building units which are derived from ethylene glycol and/or diethylene glycol and which is characterized in that the polyester polyol furthermore comprises building units which are derived from at least one long-chain polyester polyol with a number-average molar mass of 1500 to 8000 Da. The invention further relates to a process for the production thereof and use thereof, in particular for the production of rigid PUR/PIR foams.
    Type: Application
    Filed: April 8, 2014
    Publication date: February 11, 2016
    Inventors: Hartmut Nefzger, Uwe Kuenzel, Lutz Brassat
  • Patent number: 9238711
    Abstract: The present invention relates to a process for the preparation of a hydroxy-amino polymer, comprising the steps: a) reacting an H-functional starter compound carrying at least one Zerewitinoff-active H atom with an unsaturated cyclic carboxylic acid anhydride to give a carboxyl-group-carrying prepolymer, b) reacting the carboxyl-group-carrying prepolymer with at least one epoxide compound to give a hydroxyl-group-carrying prepolymer, c) adding a primary amine and/or ammonia to the double bond of the hydroxyl-group-carrying prepolymer obtained according to step b) to give the hydroxy-amino polymer, wherein the ratio of the amount of carboxylic acid anhydride to the number of Zerewitinoff-active H atoms of the H-functional starter compound is so chosen that almost all the Zerewitinoff-active H atoms of the H-functional starter compound are reacted.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: January 19, 2016
    Assignee: Bayer Intellectual Property GmbH
    Inventors: Jorg Hofmann, Klaus Lorenz, Hartmut Nefzger
  • Patent number: 9193822
    Abstract: The invention relates to a process for producing polyester polyols with secondary hydroxyl end groups, including the step of the reaction of a polyester including carboxyl end groups with an epoxide of the general formula (1): wherein R1 stands for an alkyl residue or an aryl residue and the reaction is carried out in the presence of a catalyst that includes at least one nitrogen atom per molecule. The process is distinguished in that the polyester including carboxyl end groups exhibits an acid value from ?25 mg KOH/g to ?400 mg KOH/g and a hydroxyl value from ?5 mg KOH/g and in that the polyester including carboxyl end groups is produced by ?1.03 mol to ?1.90 mol carboxyl groups or carboxyl-group equivalents of an acid component being employed per mol hydroxyl groups of an alcohol. The polyester polyols obtained, including secondary hydroxyl end groups, can be used for the purpose of producing polyurethane polymers.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: November 24, 2015
    Assignee: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Erika Bauer, Jörg Hofmann, Klaus Lorenz, Bert Klesczewski
  • Publication number: 20150322196
    Abstract: The present invention relates to a polyester polyurethane material with long term hydrolysis resistance which is prepared from perchlorates and a polyester polyol comprising structure unit I, II, and III. The polyester polyurethane material having a mole ratio of structure unit II to III of 1:1.5 to 1.5:1 has better long term hydrolysis resistance. In another aspect of the present invention, there is provided soles, carpets, rollers, sealing strips, coating, tires, wipers, steering wheels or gaskets prepared from the polyester polyurethane material, and a use of the polyester polyurethane material.
    Type: Application
    Filed: January 21, 2014
    Publication date: November 12, 2015
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Hartmut NEFZGER, Xiang LIU, John ZHANG, Sam Torres
  • Publication number: 20150299373
    Abstract: The present invention relates to a process for the production of flexible polyurethane foams, wherein there is used as starting material a polyester polyol component which is composed of at least two dicarboxylic acids.
    Type: Application
    Filed: October 23, 2013
    Publication date: October 22, 2015
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Hartmut NEFZGER, Bert KLESCZEWSKI, Sven MEYER-AHRENS, Harald KNAUP
  • Patent number: 9139685
    Abstract: The invention relates to a process for the preparation of a polyurethane polymer, comprising the step of reaction of A) polyester polyols with secondary hydroxyl end groups, which are obtainable from the reaction of a polyester comprising carboxyl end groups with an epoxide of the general formula (1): wherein R1 represents an alkyl radical or an aryl radical and wherein the polyester comprising carboxyl end groups has an acid number of from ?25 mg of KOH/g to ?400 mg of KOH/g and a hydroxyl number of ?5 mg of KOH/g, with B) polyisocyanates which are chosen from the group comprising toluoylene-diisocyanate, diphenylmethane-diisocyanate, polymeric diphenylmethane-diisocyanate, xylylene-diisocyanate, naphthylene-diisocyanate, hexamethylene-diisocyanate, diisocyanatodicyclohexylmethane and/or isophorone-diisocyanate. The invention furthermore relates to polyurethane polymers prepared by such a process.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: September 22, 2015
    Assignee: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Jörg Hofmann, Bert Klesczewski, Erika Bauer, Klaus Lorenz
  • Publication number: 20150232720
    Abstract: The present invention relates to a polyurea system, the use of such a polyurea system for sealing, linking, gluing, or covering of cellular tissue, and a dosing system having two chambers for a polyurea system such as this. The polyurea system comprises as components: A) an isocyanate-functioning prepolymer, which can be derived by reacting aliphatic isocyanates with polyoles, and B) an amino-functioning ester of aspartic acid. According to the invention, water and/or tertiary amine is added to the system, in order to increase the reacting speed of the prepolymer with the amino-functioning ester of aspartic acid while decreasing the setting time at the same time.
    Type: Application
    Filed: May 4, 2015
    Publication date: August 20, 2015
    Inventors: Heike Heckroth, Hartmut Nefzger, Christoph Eggert
  • Patent number: 9062149
    Abstract: The present invention relates to high-value polyurethane (PUR) and polyurethaneurea elastomers, which can be processed in a particularly simple manner by use of low-viscosity prepolymers based on naphthalene 1,5-diisocyanate, and to a process for production thereof.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: June 23, 2015
    Assignee: BAYER INTELLECTUAL PROPERTY GMBH
    Inventors: Florian Hupka, Stephan Reiter, Hartmut Nefzger, Jens Krause
  • Publication number: 20150166715
    Abstract: Polyurea systems comprising: (a) an amino-functional aspartic ester of the general formula (I) wherein X represents an n-valent organic radical derived from a corresponding n-functional primary amine X(NH2)n, R1 and R2 each independently represent an organic radical having no Zerevitinov active hydrogens and n represents an integer of at least 2; and (b) an isocyanate functional prepolymer having a residual monomer content of less than 1% by weight, the prepolymer prepared by reacting: (b1) an aliphatic isocyante; and (b2) a polyol component having a number average molecular weight of ?400 g/mol and an average OH functionality of 2 to 6, wherein the polyol component comprises one or more constituents selected from the group consisting of polyester polyols, polyester-polyether polyols and mixtures thereof; processes for making the same; postoperative adhesions barriers prepared therewith and dispensing systems for such polyurea systems.
    Type: Application
    Filed: March 2, 2015
    Publication date: June 18, 2015
    Inventors: Heike Heckroth, Hartmut Nefzger, Christian Wamprecht
  • Patent number: 9051410
    Abstract: The present invention relates to a polyurea system, the use of such a polyurea system for sealing, linking, gluing, or covering of cellular tissue, and a dosing system having two chambers for a polyurea system such as this. The polyurea system comprises as components: A) an isocyanate-functioning prepolymer, which can be derived by reacting aliphatic isocyanates with polyoles, and B) an amino-functioning ester of aspartic acid. According to the invention, water and/or tertiary amine is added to the system, in order to increase the reacting speed of the prepolymer with the amino-functioning ester of aspartic acid while decreasing the setting time at the same time.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: June 9, 2015
    Assignee: Medical Adhesive Revolution GmbH
    Inventors: Heike Heckroth, Hartmut Nefzger, Christoph Eggert
  • Patent number: 9029495
    Abstract: The present invention relates to a process for producing polyether polyols having primary hydroxyl end groups, comprising the steps of reacting a starter compound containing active hydrogen atoms with an epoxide under double metal cyanide catalysis, reacting the resulting product with a cyclic carboxylic anhydride and reacting this resulting product with ethylene oxide in the presence of a catalyst containing at least one nitrogen atom per molecule, excluding non-cyclic, identically substituted tertiary amines. The invention further relates to polyether polyols obtainable by this process, compositions containing said polyols and polyurethane polymers based on said polyols.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 12, 2015
    Assignee: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Erika Bauer, Jörg Hofmann, Klaus Lorenz, Norbert Hahn
  • Patent number: 9000089
    Abstract: Polyurea systems comprising: (a) an amino-functional aspartic ester of the general formula (I) wherein X represents an n-valent organic radical derived from a corresponding n-functional primary amine X(NH2)n, R1 and R2 each independently represent an organic radical having no Zerevitinov active hydrogens and n represents an integer of at least 2; and (b) an isocyanate functional prepolymer having a residual monomer content of less than 1% by weight, the prepolymer prepared by reacting: (b1) an aliphatic isocyante; and (b2) a polyol component having a number average molecular weight of ?400 g/mol and an average OH functionality of 2 to 6, wherein the polyol component comprises one or more constituents selected from the group consisting of polyester polyols, polyester-polyether polyols and mixtures thereof; processes for making the same; postoperative adhesions barriers prepared therewith and dispensing systems for such polyurea systems.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: April 7, 2015
    Assignee: Medical Adhesive Revolution GmbH
    Inventors: Heike Heckroth, Hartmut Nefzger, Christian Wamprecht
  • Publication number: 20150087774
    Abstract: The present invention relates to a composition comprising 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate and more than 50 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising monomeric isophorone diisocyanate and at least one oligomeric isophorone diisocyanate, and an isocyanate-reactive component selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof. It has been shown that the above mentioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Thus prepared molded articles are particularly suitable for the preparation of spectacle lenses, inter alia due to these properties.
    Type: Application
    Filed: April 22, 2013
    Publication date: March 26, 2015
    Inventors: Dorota Greszta-Franz, Hans-Josef Laas, Hartmut Nefzger, Jens Krause
  • Publication number: 20150080535
    Abstract: The present invention relates to a process for the preparation of a hydroxy-amino polymer, comprising the steps: a) reacting an H-functional starter compound carrying at least one Zerewitinoff-active H atom with an unsaturated cyclic carboxylic acid anhydride to give a carboxyl-group-carrying prepolymer, b) reacting the carboxyl-group-carrying prepolymer with at least one epoxide compound to give a hydroxyl-group-carrying prepolymer, c) adding a primary amine and/or ammonia to the double bond of the hydroxyl-group-carrying prepolymer obtained according to step b) to give the hydroxy-amino polymer, wherein the ratio of the amount of carboxylic acid anhydride to the number of Zerewitinoff-active H atoms of the H-functional starter compound is so chosen that almost all the Zerewitinoff-active H atoms of the H-functional starter compound are reacted.
    Type: Application
    Filed: December 17, 2012
    Publication date: March 19, 2015
    Inventors: Jörg Hofmann, Klaus Lorenz, Hartmut Nefzger
  • Publication number: 20140341835
    Abstract: The present invention relates to a process for producing a hydroxy amino polymer comprising the steps: a) Reaction of an H functional starter compound bearing at least one Zerewitinoff active H atom with an unsaturated, cyclical carboxylic acid anhydride and at least one alkylene oxide compound for obtaining a prepolymer bearing hydroxyl groups, b) Addition of a primary amine and/or of ammonia to the double bond(s) of the prepolymer bearing hydroxyl groups obtained according to step a) for obtaining the hydroxy amino polymer, wherein the ratio of added amino groups to hydroxyl groups in a hydroxy amino polymer is at least 0.6. Furthermore, the invention relates to a hydroxy amino polymer, which can be achieved according to this process as well as a polyurea/polyurethane system, which contains such a hydroxy amino polymer.
    Type: Application
    Filed: December 17, 2012
    Publication date: November 20, 2014
    Inventors: Heike Heckroth, Christoph Eggert, Jörg Hofmann, Klaus Lorenz, Edward Browne, Hartmut Nefzger