Back to results
US 10,934,386 B2Granted
Polyurethane dispersions of low hardness
AssigneeCovestro Deutschland AG
InventorsHans Georg Grablowitz, Thomas Feller
Life of this patent
Estimating the term…
Abstract
The present invention relates to aqueous polyurethane dispersions comprising pentamethylene diisocyanate and to coatings obtainable therefrom. Said coatings, given a high density of urethane and urea groups, are softer than coatings that are obtained with polyurethane dispersions comprising other aliphatic diisocyanates, for example hexamethylene diisocyanate.
Claims13
A polyurethane dispersion comprising a polyurethane component A having a hard segment comprising
- (i) an isocyanate component A1 comprising at least one isocyanate, where the proportion of pentamethylene diisocyanate (PDI) in the isocyanate component A1 is at least 50 mol %;
- (ii) at least one component selected from the group consisting of a polyol A2 which has a number-average molecular weight of at least 400 g/mol and is amorphous in the polyurethane component A, and a polyol A6 having a molecular weight of less than 400 g/mol;
- (iii) at least one component selected from the group consisting of a compound A3 having at least two isocyanate-reactive groups and at least one ionically or potentially ionically hydrophilizing group and a compound A4 having at least one isocyanate-reactive group and at least one nonionically hydrophilizing group;
- and
- (iv) a polyamine A5;
- wherein the hard segment content of the polyurethane component A is between 5% and 22% by weight and the 100% modulus of a coating produced with the polyurethane dispersion is not more than 1.8 MPa.
3 more elements
Dependencies are inferred from the claim text.