Patents by Inventor Wolfgang Rehder

Wolfgang Rehder 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).

  • Benzoin photoinitiator containing a quaternary ammonium group in photo curable composition and process
    Patent number: 4257859
    Abstract: Quaternary ammonium compounds of the formula ##STR1## where R.sup.1 and R.sup.2 are identical or different and each is H, halogen, phenyl, alkyl, alkoxy or alkylthio,R.sup.3 is H or alkyl, hydroxyalkyl, cycloalkyl or aralkyl,R.sup.4 and R.sup.5 are identical or different and each is alkyl, phenyl, cycloalkyl or aralkyl orR.sup.4 and R.sup.5 together are a --(CH.sub.2).sub.4 -- bridge, a --(CH.sub.2).sub.5 -- bridge or a --(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 -- bridge,R.sup.6 is alkyl andX.sup..crclbar. is Cl.sup..crclbar., Br.sup..crclbar., I.sup..crclbar., CH.sub.3 SO.sub.4.sup..crclbar. or C.sub.2 H.sub.5 SO.sub.4.sup..crclbar., a process for their preparation from Mannich bases of the formula ##STR2## and alkylating agents, and the use of these quaternary ammonium compounds as initiators for the photopolymerization of polymerizable mixtures containing olefinically unsaturated compounds, especially for the preparation of aqueous polymer dispersions or polymer solutions.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: March 24, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Fischer, Werner Kuesters, Erich Penzel, Wolfgang Rehder, Walter Trautmann