Patents by Inventor Jürgen Schellenberg

Jürgen Schellenberg 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).

  • Vinylaromatic polymers having high melt flow
    Patent number: 6867276
    Abstract: A process for preparing syndiotactic polymers of vinylaromatic monomers having improved melt flowability comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a titanium coordination complex capable of preparing syndiotactic vinylaromatic polymers under addition polymerization conditions in the presence of hydrogen gas at a hydrogen partial pressure from 0.1 to less than 10 kPa.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: March 15, 2005
    Assignee: Dow Global Technologies Inv.
    Inventor: Jürgen Schellenberg
  • Method of producing articles from syndiotactic vinyl aromatic polymers
    Patent number: 6818737
    Abstract: The present invention relates to a process of producing a molded article from a composition comprising a syndiotactic vinyl aromatic polymer, wherein the molded article has a residual vinyl aromatic monomer content of less than 0.05 per 100 parts syndiotactic vinyl aromatic polymer comprising molding a composition of a syndiotactic vinyl aromatic polymer having a residual vinyl aromatic monomer content of less than 0.3 parts per 100 parts syndiotactic vinyl aromatic polymer, at a temperature of from 265° C. to 305° C. to produce a molded article; and heat treating the molded article at a temperature of 210° C. to 230° C. for at least 2 minutes to thermally initiate free radical polymerization of the residual monomer.
    Type: Grant
    Filed: February 23, 2004
    Date of Patent: November 16, 2004
    Assignees: Dow Global Technologies Inc., Clean Baking Products BVBA
    Inventors: Roel Vossen, Rudi Veraart, Peter Jackson, Juergen Schellenberg, Clement Hiel
  • Method of producing articles from syndiotactic vinyl aromatic polymers
    Publication number: 20040171792
    Abstract: The present invention relates to a process of producing a molded article from a composition comprising a syndiotactic vinyl aromatic polymer, wherein the molded article has a residual vinyl aromatic monomer content of less than 0.05 per 100 parts syndiotactic vinyl aromatic polymer comprising molding a composition of a syndiotactic vinyl aromatic polymer having a residual vinyl aromatic monomer content of less than 0.3 parts per 100 parts syndiotactic vinyl aromatic polymer, at a temperature of from 265° C. to 305° C. to produce a molded article; and heat treating the molded article at a temperature of 210° C. to 230° C. for at least 2 minutes to thermally initiate free radical polymerization of the residual monomer.
    Type: Application
    Filed: February 23, 2004
    Publication date: September 2, 2004
    Inventors: Roel Vossen, Rudi Veraart, Peter Jackson, Juergen Schellenberg, Clement Hiel
  • Production of polyethylene with a titanium amide catalyst
    Patent number: 6384159
    Abstract: The present invention relates to a process to produce polyethylene through homopolymerization or copolymerization of ethylene with alpha-olefins in the presence of a titanium amide catalyst supported by an organic polymer material, for the production of moldings, such as through extrusion, injection molding, film blowing, sintering under pressure or ram extrusion. The catalyst according to the present invention contains a partially chloromethylated styrene divinyl benzene copolymer as the organic polymer material, a complex compound supported by it, which contains Mg, Al and Ti.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: May 7, 2002
    Assignee: Buna Sow Leuna Olefinverbund GmbH
    Inventors: Jürgen Schellenberg, Heinz-Jürgen Kerrinnes, Gerd Fritzsche, Gerd Lohse