Patents by Inventor Hanns P. Nuller

Hanns P. Nuller 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 for the production of diisocyanato toluene mixtures having an increased content of 2,6-diisocyanato toluene, and the use thereof as synthesis components in the production of polyurethane elastomers
    Patent number: 4293680
    Abstract: The instant invention is directed to a process for the production of diisocyanate mixtures of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene, comprising: trimerizing some of the isocyanate groups of a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having a maximum content of 2,6-diisocyanato toluene of 35% by weight based on the total mixture and isolating from the reaction mixture which is thus obtained, a diisocyanate mixture having an increased content of 2,6-diisocyanato toluene.The invention is also directed to the use of these mixtures as synthesis components in the production of polyurethane elastomers.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: October 6, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jan Mazanek, Hanns P. Nuller