Patents by Inventor Heiko Zeh

Heiko Zeh 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).

  • SiO.sub.2 flatting agent, process for its production and its use
    Patent number: 5221337
    Abstract: A universally applicable SiO.sub.2 -flatting agent is described, which consists of SiO.sub.2, 1 to 25% by weight polyol and optionally 1 to 25% by weight wax. The novel flatting agent is, even after lengthy storage, especially at pressure, still easily dispersible, does not lead to the formation of a hard sediment with non-thixotropic paints and lacquers, and has practically no negative effect on the thixotropic behaviour of paints and lacquers based on thixotropic polyamide-modified alkyd resins. The SiO.sub.2, polyol and wax can be brought together in a variety of ways, e.g. during the micronization of the SiO.sub.2 in a jet-mill or mechanical mill by adding polyol and wax at the same time, by spray-drying a suspension of SiO.sub.2 in an aqueous polyol solution or even before drying by adding polyol during washing or an earlier production step. It is also possible to spray-dry a suspension of SiO.sub.2, wax emulsion and polyol.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: June 22, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Georg Luers, Gerd W. Scheuren, Heiko Zeh
  • Photoinitiator dispersions
    Patent number: 4965294
    Abstract: The invention relates to aqueous photoinitiator dispersions for incorporation into aqueous dispersions of radiation-curable binder systems.
    Type: Grant
    Filed: May 5, 1989
    Date of Patent: October 23, 1990
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Jorg Ohngemach, Heiko Zeh