Patents by Inventor Paul Zuppinger

Paul Zuppinger 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).

  • Patent number: 4321351
    Abstract: The invention relates to a process in which, as essential components, liquid epoxy resins, carboxylic anhydrides, zinc fluoroborate complex compounds, water, tetrahydropyrane and compounds (X) which contain OH groups, COOH groups or both groups together, are reacted. Selective choice of the special quantity ratios results in reaction mixtures which, at low temperature (e.g. at 100.degree. C.), require only short moulding times and have a sufficiently long pot life. As the reaction is only slightly exothermic, the process can be used very advantageously for encapsulating electronic components.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: March 23, 1982
    Assignee: Ciba-Geigy Corporation
    Inventors: Paul Zuppinger, Dieter Baumann
  • Patent number: 4220731
    Abstract: The invention relates to a process for the preparation of crosslinked polymers by reacting liquid epoxide compounds and polyisocyanates and, if desired, polyhydroxy compounds. The curing catalysts used are complex compounds of BF.sub.3 with ethers or phosphonium compounds or H.sub.2 O. If desired, a compound of one of the metals Sn, Zn or Fe which is soluble in the reaction mixture is also added.In most cases it is possible to dispense completely with the external supply of heat when carrying out the process according to the invention, since the reaction is sufficiently exothermic. The technical advance lies in the fact that it is largely possible to dispense with heating and insulating equipment when carrying out the reaction industrially. Despite this, astonishingly high glass transition temperatures are obtained.
    Type: Grant
    Filed: June 7, 1978
    Date of Patent: September 2, 1980
    Assignee: Ciba-Geigy Corporation
    Inventor: Paul Zuppinger