Patents Assigned to Vianora Resins GmbH
  • Urethane-modified novolaks for increasing the steel cord adhesion and rigidity of vulcanized rubber blends
    Patent number: 5859169
    Abstract: Urethane-modified novolaks which are prepared by simultaneous reaction of a monohydric or polyhydric phenol (A) with an oxo compound (aldehyde or ketone) (B) and a urethane (C) in the presence of an acidic catalyst (D) at an elevated temperature of 60.degree. to 200.degree. C. and contain no interfering amounts of free starting phenol, and their use as adhesion improvers in rubbers, in particular rubbers containing reinforcing media such as steel cord or textile fibers.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: January 12, 1999
    Assignee: Vianora Resins GmbH
    Inventors: Thomas Burkhart, Siegfried Wallenwein, Gerhard Brindoepke, Gerd Walz