Patents by Inventor Gunter Boettger

Gunter Boettger 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).

  • Preparation of a pure dialkylaminoethanol stable against discoloration
    Patent number: 5663444
    Abstract: A process for the preparation of a color-stable dialkylaminoethanol of the formula ##STR1## in which R.sup.1 and R.sup.2 independently are C.sub.1 -C.sub.20 -alkyl, by reacting ethylene oxide with a dialkylamine of the formula HNR.sup.1 R.sup.2, in which R.sup.1 and R.sup.2 have the same meaning, in the presence of from 2.5 to 50% by weight of water, based on the reaction mixture, at a temperature of from 95.degree. to 170.degree. C., and separating off the water and high-boiling constituents by distillation under a reduced pressure and at a temperature of from 40.degree. to 90.degree. C. at the column bottom.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: September 2, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Johann-Peter Melder, Gunther Ruider, Tom Witzel, Karl-Heinz Ross, Gunter Boettger