Patents by Inventor Josef Huybrechts

Josef Huybrechts 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).

  • Acrylic block copolymer pigment dispersants containing heterocyclic groups
    Patent number: 6316564
    Abstract: Acrylic AB block copolymers prepared by group transfer polymerization that are useful as pigment dispersants, characterized by mononuclear or dinuclear heterocyclic groups bonded to the highly polar anchoring A segment of the block copolymer backbone to facilitate attachment on a pigment surface and improve dispersant efficiency in solvent-borne paint systems.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: November 13, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Josef Huybrechts, Daniel C. Kraiter, Roger Vervloet
  • Graft copolymer emulsions and two-package waterborne urethane coatings
    Patent number: 6239214
    Abstract: The invention concerns a graft copolymer emulsion which is anionically stabilized and which contains an amino-functional monomer. The graft copolymer, useful in a coating composition, has a weight average molecular weight of at least about 3,000 and comprises 20 to 95 weight percent of a polymer backbone and 5 to 80 weight percent of a macromonomer. The polymer backbone further comprises 0.5 to 30 weight percent of an amino-functional monomer and the macromonomer comprises at least about 5 weight percent of an unsaturated acid-functional monomer.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: May 29, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Josef Huybrechts, Peter Paul Bruylants, Anne De Marre
  • Low molecular weight (meth) acrylate copolymer emulsions
    Patent number: 6174953
    Abstract: Graft and block copolymers with a weight average molecular weight below 20,000, a hydroxy value more than 200 and acid value below 50 which copolymers comprise (a) 20-98% by weight of a water soluble macromonomer having a hydroxy value of at least 300, a weight average molecular weight below 6000, containing less than 10% by weight of an acid functional monomer and having a terminal unsaturated double bond; and (b) 2 to 80% of polymerized monomers selected from vinyl monomers, acrylate monomers, methacrylate monomers and mixtures thereof, form stable coating compositions that are compatible with polyisocyanate crosslinking agents and provide improved properties and appearance in automotive finishes.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: January 16, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Josef Huybrechts
  • Crosslinkable copolymers comprising vinyl silane and vinyl esters of branched fatty acid
    Patent number: 5886125
    Abstract: A copolymer composition and coating comprising the copolymer composition containing a vinyl silane of the formula ##STR1## where R.sub.1 is an aryl or alkyl group having 1 to 10 carbon atoms and R.sub.2 is a hydrolysable group; anda vinyl ester of a branched fatty acid having the formula ##STR2## wherein R.sub.3, R.sub.4, R.sub.5 are hydrogen or alkyl groups with 1 to 12 carbon atoms andwherein the total of R.sub.3, R.sub.4 and R.sub.5 contain at least 3 carbon atoms andoptionally at least one olefinically unsaturated compound.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: March 23, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Josef Huybrechts