Patents by Inventor Jörg Hofmann

Jörg Hofmann 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: 20130296450
    Abstract: The present invention relates to a process for the preparation of polyether carbonate polyols with primary hydroxyl end groups, comprising the steps of reaction of a starter compound containing active hydrogen atoms with an epoxide and carbon dioxide under double metal cyanide catalysis, reaction of the product obtained with a cyclic carboxylic acid anhydride and reaction of this product obtained with ethylene oxide in the presence of a catalyst which contains at least one nitrogen atom per molecule, excluding non-cyclic tertiary amines with identical substituents. The invention furthermore relates to polyether carbonate polyols obtainable by this process, compositions comprising these polyether carbonate polyols and polyurethane polymers based on these polyether carbonate polyols.
    Type: Application
    Filed: December 12, 2011
    Publication date: November 7, 2013
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Jörg Hofmann, Christoph Gürtler, Hartmut Nefzger, Norbert Hahn, Klaus Lorenz, Thomas Ernst Müller
  • Publication number: 20130261205
    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: Application
    Filed: November 18, 2011
    Publication date: October 3, 2013
    Applicant: Bater Intellectual Property GmbH
    Inventors: Hartmut Nefzger, Jörg Hofmann, Erika Bauer, Bert Klesczewski, Klaus Lorenz
  • Publication number: 20130190462
    Abstract: The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerisation of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of metal salts.
    Type: Application
    Filed: February 17, 2011
    Publication date: July 25, 2013
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Aurel Wolf, Stefan Grasser, Christoph Gürtler, Jörg Hofmann
  • Publication number: 20130184432
    Abstract: The present invention relates to a process for the preparation of polyether carbonate polyols from one or more alkylene oxides, carbon dioxide and optionally from one or more H-functional starter substances in the presence of at least one double metal cyanide catalyst, wherein the double metal cyanide catalyst comprises an unsaturated alcohol as a complexing ligand.
    Type: Application
    Filed: September 6, 2011
    Publication date: July 18, 2013
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Jörg Hofmann, Aurel Wolf, Stefan Grasser
  • Publication number: 20130123532
    Abstract: The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter substances, one or more alkylene oxides and carbon dioxide in the presence of at least one double metal cyanide catalyst, wherein the cyanide-free metal salt, the metal cyanide salt or both the mentioned salts used for the preparation of the double metal cyanide catalyst contain(s) from 0.3 to 1.8 mol base equivalents (based on 1 mol of the metal cyanide salt used for the synthesis of the catalyst) of alkaline metal hydroxide, metal carbonate and/or metal oxide.
    Type: Application
    Filed: May 13, 2011
    Publication date: May 16, 2013
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Jörg Hofmann, Aurel Wolf, Stefan Grasser
  • Publication number: 20130072602
    Abstract: The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerization of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of additives A) chosen from the group consisting of sterically non-hindered phenols, catechols, pyrocatechols, thiazines, phenothiazines, thiazoles, benzothiazoles, oxazines, phenoxazines, 2,2,6,6-tetramethylpiperidine 1-oxyl and nitrostyrenes and optionally in the presence of metal salts B).
    Type: Application
    Filed: March 24, 2011
    Publication date: March 21, 2013
    Applicant: BAYER INTELLECTUAL PROPERTY GMBH
    Inventors: Christoph Gürtler, Jörg Hofmann, Thomas Ernst Müller, Aurel Wolf, Stefan Grasser, Burkhard Köhler
  • Patent number: 8361678
    Abstract: The present invention relates to novel polyurethane compositions which are advantageous for the production of holographic media, inter alia for data storage, but also for optical applications of different types.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: January 29, 2013
    Assignee: Bayer MaterialScience AG
    Inventors: Marc-Stephan Weiser, Thomas Roelle, Friedrich-Karl Bruder, Thomas Fäcke, Dennis Hönel, Klaus Lorenz, Jörg Hofmann
  • Publication number: 20120292563
    Abstract: The invention relates to a process for the preparation of carbon nanotubes having hydroxyalkyl ester groups by reacting carbon nanotubes which have carboxylic acid groups with one or more epoxides, and to dispersions and materials which contain the carbon nanotubes functionalized thus.
    Type: Application
    Filed: January 10, 2011
    Publication date: November 22, 2012
    Applicant: BAYER INTELLECTUAL PROPERTY GMBH
    Inventors: Stephanie Vogel, Hartmut Nefzger, Jörg Hofmann
  • Publication number: 20120289732
    Abstract: The present invention relates to a process for the activation of double metal cyanide (DMC) catalysts for the preparation of polyether carbonate polyols by catalytic copolymerisation of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances.
    Type: Application
    Filed: January 18, 2011
    Publication date: November 15, 2012
    Applicant: Bayer Intellectual Property GmbH
    Inventors: Christoph Gürtler, Stefan Grasser, Jörg Hofmann, Aurel Wolf
  • Publication number: 20120244107
    Abstract: The present invention relates to a hydrogel on the basis of polyurethane or polyurethane urea, said hydrogel comprising hydrolysable functional groups in the polymer chain, to a method for producing the hydrogel and to the use of the hydrogel as adhesion barriers.
    Type: Application
    Filed: October 7, 2010
    Publication date: September 27, 2012
    Applicant: Bayer MaterialScience AG
    Inventors: Heike Heckroth, Christoph Eggert, Hartmut Nefzger, Jörg Hofmann, Edward Browne, Klaus Lorenz
  • Publication number: 20120231377
    Abstract: The invention relates to a photopolymer formulation comprising matrix polymers, writing monomers, and photo initiators, comprising a combination of at least two different writing monomers. The invention further relates to the use of the photopolymer formulation for producing optical elements, in particular for producing holographic elements and images, to a method for producing the photopolymer formulation and to a method for illuminating holographic media made of the photopolymer formulation.
    Type: Application
    Filed: November 2, 2010
    Publication date: September 13, 2012
    Inventors: Marc-Stephan Weiser, Friedrich-Karl Bruder, Thomas Rölle, Thomas Fäcke, Dennis Hönel, Jörg Hofmann
  • Publication number: 20120196999
    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: Application
    Filed: June 30, 2010
    Publication date: August 2, 2012
    Applicant: Bayer MaterialScienceAG
    Inventors: Hartmut Nefzger, Erika Bauer, Jörg Hofmann, Klaus Lorenz, Norbert Hahn
  • Publication number: 20120175563
    Abstract: The present invention relates to reactive diluents for moisture-curing coating systems containing silane groups. The invention further relates to a method for the production of said diluents, and to the use thereof in coating agents, adhesives and sealants.
    Type: Application
    Filed: September 4, 2010
    Publication date: July 12, 2012
    Applicant: Bayer MaterialScience AG
    Inventors: Mathias Matner, Klaus Lorenz, Jörg Hofmann, Michael Ludewig, Axel Schmidt, Frank Kobelka
  • Publication number: 20120177711
    Abstract: The invention relates to a coating composition containing at least one polyurethane urea which is terminated with a copolymer unit of polyethylene oxide and poly-C4-C12-alkylene oxide.
    Type: Application
    Filed: September 13, 2010
    Publication date: July 12, 2012
    Applicant: BAYER MATERIALSCIENCE AG
    Inventors: Sebastian Dörr, Jürgen Köcher, Jörg Hofmann
  • Publication number: 20120172519
    Abstract: The invention relates to a polyurethane urea dispersion, wherein the polyurethane urea (1) is terminated with a copolymer unit of polyethylene oxide and poly-C4-C12-alkylene oxide, and (2) comprises at least one polycarbonate polyol containing hydroxyl groups.
    Type: Application
    Filed: September 4, 2010
    Publication date: July 5, 2012
    Applicant: Bayer MaterialScience AG
    Inventors: Sebastian Dörr, Jürgen Köcher, Jörg Hofmann
  • Publication number: 20120123008
    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: Application
    Filed: June 29, 2010
    Publication date: May 17, 2012
    Applicant: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Jörg Hofmann, Bert Klesczewski, Erika Bauer, Klaus Lorenz
  • Publication number: 20120116114
    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: Application
    Filed: May 4, 2010
    Publication date: May 10, 2012
    Applicant: Bayer MaterialScience AG
    Inventors: Hartmut Nefzger, Erika Bauer, Jörg Hofmann, Klaus Lorenz, Bert Klesczewski
  • Publication number: 20120029162
    Abstract: The invention relates to carbon nanotubes comprising hydroxy groups, wherein the surface thereof comprises hydroxy alkyl ester groups covalently bound thereon, chosen from the group according to the general formula (1) and/or the general formula (2), wherein (CNT) stands for the surface of the carbon nanotube and R1 and R2 are independently from each other hydrocarbon, an alkyl radical or an aryl radical. The invention further relates to a method for the production thereof by means of reaction of carbon acid groups of the carbon nanotubes with an epoxy, furthermore a polyurethane polymer, wherein said carbon nanotubes are covalently bound, a method for producing a polymer of said kind and use of the carbon nanotubes for producing polymers.
    Type: Application
    Filed: March 30, 2010
    Publication date: February 2, 2012
    Applicant: Bayer Materialscience AG
    Inventors: Stephanie Vogel, Hartmut Nefzger, Jörg Hofmann
  • Publication number: 20110230581
    Abstract: Polyether polyols with an OH number of from 15 to 120 mg of KOH/g are produced by (i) introducing a mixture of DMC catalyst and a poly(oxyalkylene)polyol or a mixture of DMC catalyst and a polyether polyol (“heel”) obtainable by the process according to the invention is initially into a reactor and (ii) continuously introducing one (or more) low molecular weight starter compound(s) with a (mixed) hydroxyl functionality of from 2.2 to 6.0 and a mixture composed of a) 73 to 80 parts by weight (per 100 parts by weight of a) plus b)) of ethylene oxide and b) 27 to 20 parts by weight (per 100 parts by weight of a) plus b)) of at least one substituted alkylene oxide corresponding to a specified formula into the mixture from step (i). These polyether polyols are particularly useful for the production of flexible polyurethane foams.
    Type: Application
    Filed: March 17, 2010
    Publication date: September 22, 2011
    Applicants: Bayer MaterialScience LLC, Bayer MaterialScience AG
    Inventors: Bert Klescewski, Jörg Hofmann, Klaus Lorenz, Jack R. Reese, Jose F. Pazos
  • Publication number: 20110067309
    Abstract: A child safety gate for doorways and stairwells comprising a gate, a swivel mounted on one or two supports, wherein said supports are vertically clamped in a doorway or stairwell, thereby creating no threshold.
    Type: Application
    Filed: August 20, 2010
    Publication date: March 24, 2011
    Inventors: Raimund Hofmann, Jörg Hofmann