Patents by Inventor Gerd Ripkens

Gerd Ripkens 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).

  • Process for producing modified phenolic resin bonding agents and use thereof for producing particle board
    Patent number: 5011886
    Abstract: The inventive concept is to condense the phenol formaldehyde resins to a higher molecular weight than usual so far. Subsequent addition of urea thereto reduces viscosity to normal levels and increases solid content.The added urea does not take part in condensation reaction but partly reacts in the alkaline medium with formaldehyde to methylol urea (in a so called equilibrium reaction), which is formaldehyde donor for the phenol formaldehyde crosslinking reaction during the pressing of the particle board.The present invention relates to a process for producing modified phenolic resin bonding agents, characterized by preparing as known per se phenol-formaldehyde resins with a viscosity of more than 300 mPa.s (at 20.degree. C.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: April 30, 1991
    Assignee: Rwe-Dea Aktiengesellschaft fur Mineraloel und Chemie
    Inventors: Adolf Buschfeld, Matthias Lattekamp, Gerd Ripkens, Hans Schittek
  • Process for the manufacture of multi-layer particle board using a phenol formaldehyde resin having a lower solids content
    Patent number: 4525227
    Abstract: A process for the manufacture of triple- and multi-layer particle board employing phenol formaldehyde resin compositions for gluing particles in the outer layers of the board characterized by the use of a phenol formaldehyde resin composition having a viscosity of about 30-90 seconds (4-mm DIN cup), a solids content of between about 30 and 39 percent by weight and an alkali content of less than 8 percent by weight is provided.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: June 25, 1985
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Gerd Ripkens, Hans Schittek, Adolf Buschfeld
  • Process for making phenol-aldehyde resins
    Patent number: 4244906
    Abstract: Phenol-aldehyde resins are prepared by condensing phenol with formaldehyde and isobutyraldehyde in the presence of an alkali. The resulting resins are particularly suited for manufacturing products such as fiberboard and chipboard.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: January 13, 1981
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Karl-Heinz Heinemann, Georg Michalczyk, Gerd Ripkens