Patents by Inventor Erhard Michels

Erhard Michels 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).

  • Polyurethane elastomers which exhibit improved stability to hydrolysis
    Patent number: 6737471
    Abstract: A solid and/or cellular polyurethane elastomers which are produced using polyester polyols are disclosed. The elastomers which exhibit improved stability to hydrolysis are characterized in that their preparation is carried out in the presence of at least one esters of monobasic carboxylic acid or polybasic carboxylic acids, the (first) dissociation constant (pK) of which is 0.5 to 4.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: May 18, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Lorenz, Marc Schütze, Erhard Michels, Alexander Eckhardt
  • Polyurethane elastomers and processes for their preparation and use
    Publication number: 20040082677
    Abstract: Polyurethane elastomers having a defined node density are produced from specific polyetherester polyols. These elastomers are particularly useful for the production of microcellular and solid polyurethane elastomer components.
    Type: Application
    Filed: October 20, 2003
    Publication date: April 29, 2004
    Inventors: Erhard Michels, Hartmut Nefzger, Stephan Schleiermacher
  • Polyisocyanates and polyurethanes containing polymer modifiers, and their use
    Publication number: 20030220445
    Abstract: The invention relates to polymer-modified polyisocyanates and to polyurethanes prepared therefrom, and to their use in the production of polyurethane molded bodies. The polyisocyanates are modified with thermoplastic vinyl polymers having a number average molecular weight of from 15 to 90 kg/mol.
    Type: Application
    Filed: May 19, 2003
    Publication date: November 27, 2003
    Inventors: Eduard Mayer, Erhard Michels, Helmut Meyer, Klaus Pleiss
  • Polyurethane elastomers which exhibit improved stability to hydrolysis
    Publication number: 20020120027
    Abstract: A solid and/or cellular polyurethane elastomers which are produced using polyester polyols are disclosed. The elastomers which exhibit improved stability to hydrolysis are characterized in that their preparation is carried out in the presence of at least one esters of monobasic carboxylic acid or polybasic carboxylic acids, the (first) dissociation constant (pK) of which is 0.5 to 4.
    Type: Application
    Filed: December 14, 2001
    Publication date: August 29, 2002
    Inventors: Klaus Lorenz, Marc Schutze, Erhard Michels, Alexander Eckhardt
  • Polyurethane elastomers which exhibit improved stability to hydrolysis
    Publication number: 20020120028
    Abstract: A solid and/or cellular polyurethane elastomers which are produced using polyester polyols are disclosed. The elastomers which exhibit improved stability to hydrolysis are characterized in that their preparation is carried out in the presence of at least one disulphonates or polysulphonates.
    Type: Application
    Filed: December 14, 2001
    Publication date: August 29, 2002
    Inventors: Klaus Lorenz, Marc Schutze, Erhard Michels, Alexander Eckhardt
  • Method for producing semi-rigid compact or cellular shaped bodies with a PUR base and the stabilization thereof; shaped bodies produced according to said method and the use thereof
    Patent number: 6169157
    Abstract: This invention relates to a process for producing polyester-polyurethane compositions, and to the stabilization thereof in relation to hydrolytic ageing phenomena by an active ingredient combination comprising compounds containing carbodiimides with lactone derivatives, to mouldings produced therefrom and to the use thereof for semi-rigid, solid and/or cellular mouldings.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: January 2, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erhard Michels, Klaus Pleiss, Hans-Norbert Dick
  • Two step procedure for the production of semi-hard solid polyurethane molded bodies
    Patent number: 6147181
    Abstract: The invention relates to a process for preparing solid, transparent to translucent polyurethane molded items which, due to their elastic and optical properties, can be used, for instance, as an alternative material to rubber.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: November 14, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erhard Michels, Klaus Pleiss, Franz Scholtis
  • Process for the CFC-free production of cellular polyurethane molded parts
    Patent number: 5464880
    Abstract: A process for the CFC-free production of cellular polyurethane molded parts/articles with solid surfaces by reacting a reaction mixture of per se known starting materials in sealed molds, to yield polyurethane foams. Carbamates obtainable from aliphatic aminoalcohols and carbon dioxide are used as blowing agents, optionally in conjunction with other blowing agents. The process is suitable for producing foam coverings on steering wheels, spoilers and protective upholstery in car interiors, and for producing soles of shoes or shoe components.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: November 7, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans G. Weber, Peter Haas, Erhard Michels, Christian Weber, Klaus Brecht