Patents by Inventor Johan Stapersma

Johan Stapersma 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).

  • Patent number: 7141527
    Abstract: A catalyst system for the polymerization of olefins comprising the product obtained by contacting: (A) a metallocene complex; (B) an organometallic aluminium compound of formula (II): Al[CH2—C(Ar)R4R5]xHy??(II) wherein Ar is a substituted or unsubstituted aryl group having from 6 to 20 carbon atoms; R4 is a linear or branched, saturated or unsaturated, C1–C10 alkyl, C6–C20 aryl, C7–C20 arylalkyl or C7–C20 alkylaryl; R5 is hydrogen or a linear or branched, saturated or unsaturated, C1–C10 alkyl, C6–C20 aryl, C7–C20 arylalkyl or C7–C13 alkylaryl group; x=2 or 3; y=3-x; and water; the molar ratio (B)/(C) being between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: November 28, 2006
    Assignee: Basell Polyolefine GmbH
    Inventors: Jan F. Van Baar, Andrew D. Horton, Gerard M. M. Van Kessel, Eric Kragtwijk, Max Van De Pas, Peter A. Schut, Johan Stapersma
  • Patent number: 6703457
    Abstract: A process for preparing propylene polymer comprising contacting, under polymerization conditions, propylene and optionally ethylene, with a catalyst system comprising a bridged metallocene and a suitable activating cocatalyst, said process being characteized by reducing the concentration of hydrogen formed during the polymerization reaction.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: March 9, 2004
    Assignee: Basell Polyolefine GmbH
    Inventors: Jan F. van Baar, Andrew D. Horton, Peter A. Schut, Johan Stapersma
  • Publication number: 20030130445
    Abstract: A process for preparing propylene polymer comprising contacting, under polymerisation conditions, propylene and optionally ethylene, with a catalyst system comprising a bridged metallocene and a suitable activating cocatalyst, said process being characteised by reducing the concentration of hydrogen formed during the polymerization reaction.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 10, 2003
    Inventors: Jan F. Van Baar, Andrew D. Horton, Peter A. Schut, Johan Stapersma
  • Patent number: 5179225
    Abstract: A carbonylation catalyst system, which comprises:a) a source of a Group VIII metal;b) a source of a phosphine having an aromatic substituent containing an imino nitrogen atom;c) a source of protons; andd) a source of an alkylsulfonate anion, and the use of such a catalyst system in the carbonylation of an acetylenically or olefinically unsaturated compound.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: January 12, 1993
    Assignee: Shell Oil Company
    Inventors: Eit Drent, Petrus H. M. Budzelaar, Willem W. Jager, Johan Stapersma
  • Patent number: 5166116
    Abstract: A carbonylation catalyst system, which comprises:a) a source of a Group VIII metal;b) a source of a phosphine having an aromatic substituent containing an imino nitrogen atom;c) a source of protons; andd) a source of an alkylsulfonate anion, and the use of such a catalyst system in the carbonylation of an acetylenically or olefinically unsaturated compound.
    Type: Grant
    Filed: February 5, 1991
    Date of Patent: November 24, 1992
    Assignee: Shell Oil Company
    Inventors: Eit Drent, Petrus H. M. Budzelaar, Willem W. Jager, Johan Stapersma
  • Patent number: 5049672
    Abstract: The invention is a complex-forming polymer comprising at least one aryl group having a 2,2'-bipyridine complex-forming moiety or a 1,10-phenanthroline complex-forming moiety. The complex-forming polymers are prepared by contacting a substituted 2,2'-bipyridine or a substituted 1,10-phenanthroline compound with a metalating agent, and then reacting the metalated compound with an halomethylated polystyrene polymer, or alternatively, reacting the metalated compound with at least one vinylbenzyl halide and subsequently polymerizing the reaction product. The complex-forming polymers are hydrolytically stable and may be used as polymeric ligands as such or complexed with selected metal compounds.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: September 17, 1991
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma
  • Patent number: 4933455
    Abstract: The invention relates to nitrogen-containing bidentate compound immobilized on a solid carrier having the formula ##STR1## wherein the symbols have specified meanings intermediate thereto and to processes for the preparation.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: June 12, 1990
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma
  • Patent number: 4910264
    Abstract: The invention is a complex-forming polymer comprising at least one aryl group having a 2,2'-bipyridine complex-forming moiety or a 1,10-phenanthroline complex-forming moiety. The complex-forming polymers are prepared by contacting a substituted 2,2'-bipyridine or a substituted 1,10-phenanthroline compound with a metalating agent, and then reacting the metalated compound with an halomethylated polystyrene polymer, or alternatively, reacting the metalated compound with at least one vinylbenzyl halide and subsequently polymerizing the reaction product. The complex-forming polymers are hydrolytically stable and may be used as polymeric ligands as such or complexed with selected metal compounds.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: March 20, 1990
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma
  • Patent number: 4873333
    Abstract: The invention relates to nitrogen-containing bidentate compound immobilized on a solid carrier having the formula ##STR1## wherein the symbols have specified meanings intermediate thereto and to processes for the preparation.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: October 10, 1989
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma
  • Patent number: 4873212
    Abstract: The invention relates to nitrogen-containing bidentate compound immobilized on a solid carrier having the formula ##STR1## wherein the symbols have specified meanings intermediate thereto and to processes for the preparation.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: October 10, 1989
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma
  • Patent number: 4814457
    Abstract: The invention is a complex-forming polymer comprising at least one aryl group having a 2,2'-bipyridine complex-forming moiety or a 1,10-phenanthroline complex-forming moiety. The complex-forming polymers are prepared by contacting a substituted 2,2'-bipyridine or a substituted 1,10-phenanthroline compound with a metalating agent, and then reacting the metalated compound with an halomethylated polystyrene polymer, or alternatively, reacting the metalated compound with at least one vinylbenzyl halide and subsequently polymerizing the reaction product. The complex-forming polymers are hydrolytically stable and may be used as polymeric ligands as such or complexed with selected metal compounds.
    Type: Grant
    Filed: December 23, 1986
    Date of Patent: March 21, 1989
    Assignee: Shell Oil Company
    Inventor: Johan Stapersma