Patents by Inventor Ludwig Lelgemann

Ludwig Lelgemann 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 (2-hydroxyethyl)-melamines and their use as modifiers in the preparation of aminoplast resins
    Patent number: 4668785
    Abstract: N,N',N"-tris-(2-hydroxyethyl)-melamine, if required, as a mixture with N-mono- and N,N'-bis-(2-hydroxyethyl)-melamine, is prepared by reacting melamine with ethanolamine in the presence of an acidic catalyst by a method in which the reaction is carried out at from 120.degree. to 250.degree. C. using an excess of ethanolamine, and the molar ratio of free ethanolamine to the sum of free and converted melamine is not permitted to fall below 4:1 during the entire reaction time, and the stated (2-hydroxyethyl)-melamines are used as modifiers in the prepartion of aminoplast resins which are suitable for laminating surfaces.
    Type: Grant
    Filed: June 13, 1985
    Date of Patent: May 26, 1987
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Ebel, Wolfgang Reuther, Wolfram Weiss, Ludwig Lelgemann
  • Process for the manufacture of impregnating melamine resins
    Patent number: 4038229
    Abstract: Aqueous impregnating resins based on a condensate of melamine and formaldehyde containing a lower fatty acid dialkyl amide such as dimethyl acetamide either in solution or as part of the condensate, and a process for the manufacture thereof.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: July 26, 1977
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Wolfgang Eisele, Ludwig Lelgemann, Bernhard Magerkurth, Harro Petersen