Back to results
US 5,496,908 AGranted
Water-soluble polyurethane and use thereof to thicken water-based systems such as water-based paints
AssigneeBerol Nobel AB
InventorsPeter Bostrom, Annelie Askenbom, Eva Gottberg-Klingskog
Life of this patent
Estimating the term…
Abstract
A water-soluble polyurethane, including a polymer backbone; end groups provided on the ends of the polymer backbone and containing water-soluble oxyethylene groups having a molecular weight ranging from 400 to 15,000, and groups pendant from the polymer backbone and containing hydrocarbon groups having 8-22 carbon atoms, in a number of at least 0.1 per urethane bond. The water-soluble polyurethane has moderate viscosities in aqueous solution and is especially useful as a thickener, for instance, in alkyd- or latex-based paints.
Claims14
A water-soluble polyurethane, comprising:
- (a) a polymer backbone;
- (b) end groups provided on the ends of the polymer backbone and containing water-soluble oxyethylene groups having a molecular weight ranging from 400 to 15,000;
- (c) groups pendant from the polymer backbone and containing hydrocarbon groups having 8-22 carbon atoms, in a number of at least 0.1 per urethane bond;
- and
- (d) a segment contained within the polymer backbone having a formula IIa:
- ##STR6## wherein R is a hydrophobic group pendant from the polymer backbone and contains a monovalent hydrocarbon group having 8-22 carbon atoms, A is an oxyalkylene group having 2-4 carbon atoms, B is a trivalent group, and m and n range from 20-140 and have a sum, m+n, which is 50-200, and the number of oxyethylene units being such that the polyurethane becomes water-soluble.
3 more elements
Dependencies are inferred from the claim text.