Patents by Inventor Bernd Terwiesch

Bernd Terwiesch 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 removal of vinyl chloride from polyvinyl chloride dispersions
    Patent number: 4017445
    Abstract: Residual vinyl chloride contents of aqueous polyvinyl chloride dispersions is reduced to less than 50 ppm by withdrawing steam and vinyl chloride contained in a boiling aqueous polyvinyl chloride dispersion at a temperature of 80.degree.-100.degree. C. and at a vaporization rate per minute of 0.006-0.2 kg. steam per kg. of polyvinyl chloride for a period of time from 3-60 minutes until a vinyl chloride content of less than 50 p.p.m. is achieved.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: April 12, 1977
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Hans Grosse-Wortmann, Bernhard Hentschel, Peter Rauth, Karl-Heinz Schoenberg, Bernd Terwiesch, Hermann Winter
  • Process for preventing encrustations during the manufacture of polymers and copolymers of vinyl chloride by suspensions polymerization
    Patent number: 3995096
    Abstract: Encrustations on reactor walls and associated equipment employed in the aqueous suspension polymerization of vinyl chloride and mixtures thereof with other monomers at 30.degree.-70.degree. C. are prevented by employing in the polymerization charge 0.0005 - 0.05% by weight of hydrogen peroxide, calculated on the monomer or monomers, preferably at a pH of at least 7.5, e.g., 7.5 - 8.5 when using a suspending agent which is sensitive to hydrolysis.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: November 30, 1976
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Karsten Flatau, Lothar Hinz, Bernd Terwiesch
  • Prevention of wall deposits during polyvinyl chloride polymerizations
    Patent number: 3966695
    Abstract: The formation of polymer on the surfaces of the reactor equipment in the commercial production of polyvinyl chloride and copolymers thereof is avoided by employing equipment whose surfaces which contact the monomer are formed of substantially pure nickel.
    Type: Grant
    Filed: February 6, 1975
    Date of Patent: June 29, 1976
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Karsten Flatau, Bernd Terwiesch