Patents by Inventor Rienk Hettema

Rienk Hettema 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).

  • Polyurethane dispersant resin
    Patent number: 8017686
    Abstract: The invention relates to a polyurethane dispersant resin having a polyurethane backbone having pendant hydrophilic polyalkylene oxide based side groups, the pendant side groups being linked to the polyurethane backbone via covalent bonds, and wherein the content of polyalkylene oxide in the polyurethane dispersant resin is at least 45% by weight, characterized in that the polyurethane additionally has pendant hydrophobic side groups which are linked to the polyurethane backbone via covalent bonds.
    Type: Grant
    Filed: August 21, 2006
    Date of Patent: September 13, 2011
    Assignee: Akzo Nobel Coating International B.V.
    Inventors: Roelof Buter, Josephina Johanna Hendrika Maria Raben-Schlief, Hendrik Meijer, Geertje Marte Kuiken, Rienk Hettema, Jamie MacLiver Roy, Bart Bouma
  • Pigment preparation
    Patent number: 7846997
    Abstract: The invention relates to a solid pigment preparation comprising at least 35% by weight of one or more pigments and at most 65% by weight of a dispersant resin, wherein the dispersant resin comprises a polyester backbone having at least one pendent hydrophilic polyalkylene oxide monoalkylether group, the dispersant resin comprising 30 to 80% by weight of alkylene oxide units and having a number average molecular weight of 1,000 to 150,000.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: December 7, 2010
    Assignee: Akzo Nobel Coatings International B.V.
    Inventors: Klaas Jan Hendrik Kruithof, Rienk Hettema, Roger MacLiver Roy, Hendrik Meijer
  • Pigment Preparation
    Publication number: 20080269403
    Abstract: The invention relates to a solid pigment preparation comprising at least 35% by weight of one or more pigments and at most 65% by weight of a dispersant resin, wherein the dispersant resin comprises a polyester backbone having at least one pendent hydrophilic polyalkylene oxide monoalkylether group, the dispersant resin comprising 30 to 80% by weight of alkylene oxide units and having a number average molecular weight of 1,000 to 150,000.
    Type: Application
    Filed: October 3, 2006
    Publication date: October 30, 2008
    Applicant: AKZO NOBEL COATINGS INTERNATIONAL B.V.
    Inventors: Klaas Jan Hendrik Kruithof, Rienk Hettema, Jamie MacLiver Roy, Hendrik Meijer
  • Polyurethane Dispersant Resin
    Publication number: 20080214729
    Abstract: The invention relates to a polyurethane dispersant resin having a polyurethane backbone having pendant hydrophilic polyalkylene oxide based side groups, the pendant side groups being linked to the polyurethane backbone via covalent bonds, and wherein the content of polyalkylene oxide in the polyurethane dispersant resin is at least 45% by weight, characterized in that the polyurethane additionally has pendant hydrophobic side groups which are linked to the polyurethane backbone via covalent bonds.
    Type: Application
    Filed: August 21, 2006
    Publication date: September 4, 2008
    Applicant: AKZO NOBEL COATINGS INTERNATIONAL B.V.
    Inventors: Roelof Buter, Josephina Hendrika Maria Raben-Schlief, Hendrik Meijer, Geertje Marte Kuiken, Rienk Hettema, Jamie MacLiver Roy, Bart Bouma