Back to results
US 5,470,907 AGranted
Aqueous polyurethane dispersions
AssigneeBASF SE
InventorsAlexander Wallon, Gerhard Auchter, Ulrike Licht, Karl Haeberle, Angelika Funhoff
Life of this patent
Estimating the term…
Abstract
Aqueous polyurethane dispersions contain, at a pH of the dispersing medium of .gtoreq.6, an anionically stabilized polyurethane present in disperse form as well as an added polymer having acidic functions and intended for reducing the flow resistance.
Claims10
An aqueous polyurethane dispersion containing
- A) at least one polyurethane (component A) dispersed in an aqueous medium and having negatively charged groups at a pH of the aqueous dispersing medium of .gtoreq.6, as the main component, and
- B) 0.1 to 5.0% by weight, based on component A, of at least one polymer (component B) which comprises, in polymerized form,
- a) from 25 to 100% by weight of at least one unsaturated monomer which has at least one Bronsted acid group (monomers Ba) and
- b) from 0 to 75% by weight of one or more monomers capable of undergoing free radical copolymerization (monomers Bb),
- with the proviso that component B has a number average molecular weight of from 1,000 to 50,000,
- component B acts as a Bronsted acid when added to water at 25.degree. C., the aqueous dispersing medium of the aqueous polyurethane dispersion has a pH of .gtoreq.6 at 25.degree. C. and wherein the aqueous polyurethane dispersion contains no polyvalent metal ions.
3 more elements
Dependencies are inferred from the claim text.