Patents by Inventor Willi Roll

Willi Roll 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).

  • Method for producing resols
    Patent number: 6410776
    Abstract: The invention relates to a process for the preparation of resols by reacting phenolic compounds with aldehydes with catalysis by metal salts whose cation can easily be precipitated as low-solubility salts in industrial processes. In this process, a dispersant is added to the reaction mixture comprising phenolic compound, aldehyde and metal salt before, during or after the condensation reaction, and a complexing agent is admixed after the condensation reaction is complete and after the dispersant has been admixed. The resultant resins are transparent even after neutralization using sulphuric acid.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: June 25, 2002
    Assignee: Bakelite AG
    Inventors: Willi Roll, Axel Bottcher, Walter Napp, Peter Fricke
  • Bonding agent composition, its use as well as a process for the production of particle board
    Patent number: 6043350
    Abstract: The bonding agent composition comprises tannin of pine bark and/or pecan nut, paraformaldehyde and an ammonium salt of a weak acid. It serves inter alia as bonding agent for particle board with high transverse tensile strength, good water resistance and low formaldehyde emission.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: March 28, 2000
    Assignee: Bakelite AG
    Inventors: Willi Roll, Antonio Pizzi, Peter Stracke
  • Heat-curable tannin-based binding agents
    Patent number: 5532330
    Abstract: A heat-curable, formaldehyde-free binding agent comprising a polyflavonoid type tannin and as a curing catalyst, a compound having a weak acid reaction curable at relatively high temperatures and compatible with cellulose containing materials such as wood chips for the production of particle boards.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: July 2, 1996
    Assignee: Rutgerswerke Aktiengesellschaft
    Inventors: Antonio Pizzi, Willi Roll, Berthold Dombo
  • Binder mixtures containing reactive group containing lignin and novolaks
    Patent number: 5382608
    Abstract: A binder mixture containing lignin or lignins with reactive groups and phenol-novolac in a weight ratio of 95:5 to 50:50 useful for the production of non-woven fabrics and wood fiber materials.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: January 17, 1995
    Assignee: Rutgerswerke Aktiengesellschaft
    Inventors: Arno Gardzielia, Ken Kurple, Achim Hansen, Stephan Schroter, Willi Roll
  • Binder mixtures containing lignin and phenol novolaks
    Patent number: 5373070
    Abstract: A binder mixture containing lignin or lignins with reactive groups and phenol-novolac in a weight ratio of 95:5 to 50:50 useful for the production of non-woven fabrics and wood fiber materials.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: December 13, 1994
    Assignee: Rutgerswerke Aktiengesellschaft AG
    Inventors: Arno Gardziella, Ken Kurple, Achim Hansen, Stephan Schroter, Willi Roll