Aqueous polyurethane dispersions

Details Aqueous polyurethane dispersions Aqueous polyurethane dispersions

C - Chemistry, Metallurgy

08

L

C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/65 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2081729

- 27 - O.Z. 0050/42812 Abstract of the Disclosure: Aqueous dispersions contain- ing a polyurethane and from 5 to 60% by weight, based on the polyurethane, of an adhesion-improving polymer, wherein the polyurethane consists essentially of (a) organic diisocyanates, (b) dihydroxy compounds which have a molecular weight of from more than 500 to 5,000 g/mol and contain no ionic groups or groups convertible into ionic groups, (c) compounds having one or two functional groups reactive toward isocyanate and at least one ionic group or group convertible into an ionic group and (d) compounds having at least 3 isocyanate groups or at least 3 functional groups reactive toward isocyana- te, (e) with or without compounds which differ from (c) and have two functional groups reactive toward isocyan- ate and a molecular weight of from 60 to 500 g/mol, and compounds (d) are used in amounts such that the functionality F of all components, which is defined by the quotient Number of moles of all isocyanate groups and functional groups reactive with isocyanate F = Number of moles of all components is from 2.01 to 2.5, and the polyurethane or a prepolymer thereof is prepared in a water-miscible solvent boiling below 100°C and, after addition of the adhesion-improving polymer, is dispersed in water.

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