Patents by Inventor Karl-Uwe Haas

Karl-Uwe Haas 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).

  • Continuous process for the manufacture of low-density polyethylene in stirred autoclaves
    Patent number: 4607086
    Abstract: An improved continuous process for the manufacture of polymers of ethylene in autoclave reactors with practically complete back-mixing under pressure of from about 800 to about 2500 bars in the presence of free-radical-generating initiators is provided wherein (a) two autoclaves are connected in series in such a way that all the reaction product from the first reactor is fed to the second reactor, (b) each autoclave has a length/diameter (L/D) ratio of from about 1:1 to about 3:1, (c) the monomer(s) feed stream is divided between the two reactors such that when the temperature/concentration and/or pressure environment in the first reactor is different from that in the second reactor, the monomer(s) feed stream to the first reactor is equal to or greater than the monomer(s) feed stream to the second reactor, (d) the reaction temperatures in the two autoclaves are set such that when the temperature in the first reactor is different from that in the second reactor, the temperature in the first reactor is lower t
    Type: Grant
    Filed: November 17, 1980
    Date of Patent: August 19, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Hubert Sutter, Karl-Uwe Haas, Winston P. Ledet