Patents by Inventor Bernard Druet

Bernard Druet 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 the manufacture of urea-formaldehyde resins containing melamine
    Patent number: 5008365
    Abstract: A process for the preparation of a urea-formaldehyde resin exhibiting reduced gel time and improved stability, wherein the resin contains not more than 10% melamine, which is added during the first stage of the reaction with the other reactants, and wherein the reaction is conducted at an acidic pH.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: April 16, 1991
    Assignee: Norsolor (Orkem Group)
    Inventors: Bernard Druet, Gerald Rochet
  • Process for the preparation of aminoplastic resins having very low formaldehyde emission rates
    Patent number: 4997905
    Abstract: The preparation of aminoplastic resins containing melamine, having very low rates of formaldehyde emission, and being particularly useful for the production of particle boards. In a second stage of the process for preparing the resin, additional NH.sub.2 (melamine and urea) is added to a conventional condensate solution at an increased pH between 6 and 9 so as to lower the F/NH.sub.2 molar ratio to between 0.5 and 0.9. Urea is added in a third stage to obtain an F/NH.sub.2 of between 0.30 and 0.50, with the optional addition of borax.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: March 5, 1991
    Assignee: Norsolor (Orkem Group)
    Inventors: Bernard Druet, Daniel Hopin