Patents by Inventor Michael Gassan

Michael Gassan 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).

  • Production of rigid polyurethane foams
    Patent number: 6087409
    Abstract: In a process for producing rigid polyurethane foams by reactinga) polyisocyanatesb) compounds containing at least two hydrogen atoms capable of reacting with isocyanate groups, in the presence ofc) catalysts,d) blowing agents and, if desired,e) further auxiliaries and/or additives,the component b) comprises at least one recycled polyol which is formed by glycolysis of polyurethanes.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: July 11, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Naber, Werner Schmiade, Michael Gassan
  • Recycling of plastic waste containing a mixture of polyurethanes with other plastics
    Patent number: 6069182
    Abstract: A process for recycling plastic waste containing a mixture of polyurethanes and other plastics, comprises reacting the plastic waste with an alcohol mixture comprising at least one low-molecular-weight, at least difunctional alcohol and at least one polyether-polyol, and then separating the resultant glycolysis polyol mechanically from the other plastic waste.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: May 30, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Naber, Vera Neiss, Michael Gassan, Werner Deutsch
  • Reduction of the amine content of recycled polyols
    Patent number: 5968992
    Abstract: In a process for reducing the primary amine content of a composition comprising at least one polyol, in which a composition comprising at least one polyol is admixed with at least one isocyanate which contains only secondary and/or tertiary, aliphatically bound isocyanate groups, isocyanate is added in an amount of up to 5% by weight, based on the total composition, and a polyol preparation is obtained.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: October 19, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernhard Naber, Michael Gassan, Thomas Schupp, Sarbananda Chakrabarti
  • Preparation of recyclate polyols, and the use thereof in the preparation of polyurethanes
    Patent number: 5357006
    Abstract: A process for the preparation of recyclate polyols obtained by glycolysis of polyurethanes and/or polyurea-polyurethanes comprises metering in monofunctional and/or difunctional glycidyl ethers over the entire course of the reaction; the low-amine recyclate polyols obtained in this way are used for the preparation of cellular or noncellular polyurethanes.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: October 18, 1994
    Assignee: BASF Schwarzheide GmbH
    Inventors: Michael Gassan, Bernhard Naber, Vera Neiss, Peter Moeckel, Wolfgang Weissflog