Patents by Inventor Deon De Wet-Roos

Deon De Wet-Roos 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).

  • Vesiculated polymer particles
    Patent number: 7572846
    Abstract: Vesiculated polymer particles and a method of manufacture thereof, are suitable for the beneficial replacement of titanium dioxide pigments and extenders amongst others, and have improved opacity, whiteness, scrub resistance and water resistance due. The manufacturing process exhibits effective control of particle size and particle size distribution.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: August 11, 2009
    Assignee: Freeworld Coatings Capital
    Inventors: John Francis Engelbrecht, Deon De Wet-Roos, Albertus Christiaan Smit, Boyd Cooray
  • Tandem tetramerisation-polymerisation of olefins
    Patent number: 7323524
    Abstract: The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a selectivity greater than 30%.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: January 29, 2008
    Assignee: Sasol Technology (PTY) Limited
    Inventors: Kevin Blann, Deon De Wet-Roos, John Thomas Dixon
  • Polymerisation of olefinic compounds
    Patent number: 7285607
    Abstract: This invention relates to a process for producing a polymeric product by the polymerisation of at least one olefinic compound in the form of an olefin or a compound including an olefinic moiety by contacting the at least one olefinic compound with a polymerisation catalyst. The catalyst comprises the combination of a source of a Group IV to VI transition metal; and a ligating compound of the formula (R1)mX1(Y)X2(R2)n. The process is characterised therein that when R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains at least one non-polar substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 70° C.; and where R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains no substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 90° C.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: October 23, 2007
    Assignee: Sasol, Chemical Industries, Limited
    Inventors: Kevin Blann, Deon De Wet-Roos, Dawid Johannes Joubert, Esna Killian, John Thomas Dixon, Nonhlanhla Jillian Phelembe, Aletta Du Toit
  • Tandem tetramerisation-polymerisation of olefins
    Publication number: 20060128910
    Abstract: The invention provides a process for polymerising olefins to branched polyolefins in the presence of a polymerisation catalyst and a cocatalyst, wherein the cocatalyst produces 1-octene in a selectivity greater than 30%.
    Type: Application
    Filed: December 19, 2003
    Publication date: June 15, 2006
    Inventors: Kevin Blann, Deon De Wet-Roos, John Dixon
  • Vesiculated polymer particles
    Publication number: 20060111474
    Abstract: Vesiculated polymer particles and a method of manufacture thereof, are suitable for the beneficial replacement of titanium dioxide pigments and extenders amongst others, and have improved opacity, whiteness, scrub resistance and water resistance due. The manufacturing process exhibits effective control of particle size and particle size distribution.
    Type: Application
    Filed: September 23, 2003
    Publication date: May 25, 2006
    Inventors: John Engelbrecht, Deon De Wet-Roos, Albertus Smit, Boyd Cooray
  • Polymerisation of olefinic compounds
    Publication number: 20060020091
    Abstract: This invention relates to a process for producing a polymeric product by the polymerisation of at least one olefinic compound in the form of an olefin or a compound including an olefinic moiety by contacting the at least one olefinic compound with a polymerisation catalyst. The catalyst comprises the combination of a source of a Group IV to VI transition metal; and a ligating compound of the formula (R1)mX1(Y)X2(R2)n. The process is characterised therein that when R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains at least one non-polar substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 70° C.; and where R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains no substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 90° C.
    Type: Application
    Filed: May 17, 2005
    Publication date: January 26, 2006
    Inventors: Kevin Blann, Deon De Wet-Roos, Dawid Joubert, Esna Killian, John Dixon, Nonhlanhla Phelembe, Aletta Toit