Patents by Inventor Hans Brutting

Hans Brutting 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).

  • Process and device for producing high-viscosity or highly stabilized reaction-stable polyamides, and for continuously demonomerizing polyamides
    Patent number: 6258926
    Abstract: The invention concerns a process and device for producing high-viscosity or highly stabilized, reaction-stable polyamides, in particular polyamide 6, with reactive amino end groups of less than 50 &mgr;eq/g and for continuously demonomerizing polyamides. The object of the invention is to produce simply, reliably and economically a high-viscosity or highly stabilized reaction-stable polyamide, in particular polyamide 6, and if necessary to carry out continuous demonomerization. According to the invention, the molten polyamide is brought into intimate contact, or intimately mixed with preheated nitrogen in a reaction system in at least one stage and a specific dwell time is set for the melt in a liquid phase. During the production of polyamide 6, expelled lactam is processed and fed to a polymerization reactor.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: July 10, 2001
    Assignee: Polymer Engineering GmbH
    Inventors: Karl-Heinz Wiltzer, Baldur Ebert, Hans Brutting, Peter Lausmann