Polyurethane-polyurea coatings

Abstract

The present invention provides coating agents made up of the reaction product of a) a polycarbonatediol component comprising a1) a polytetramethylene glycol-based polycarbonatediol with a molecular weight of between 400 and 8000, anda2) optionally other polyols with a molecular weight of from 200 to 8000,b) 0.5-2.0 mol per mol of a) of a chain extender selected from the group consisting of a low-molecular weight aliphatic or cycloaliphatic diol, a low-molecular weight aliphatic or cycloaliphatic diamine, and hydrazine, andc) 1.5-3.0 mol per mol of a) of an aliphatic, cycloaliphatic or aromatic diisocyanate, dissolved in d) 40-90 percent by weight (based on the total formulation) of an organic solvent selected from the group consisting of linear or cyclic esters, ketones, alcohols, aromatic compounds and mixtures thereof.

Description

Claims

1. A coating agent based on polyurethane-polyureas comprising the reaction product of a) a polycarbonatediol component comprising a1) a polytetramethylene glycol-based polycarbonatediol with a molecular weight of between 400 and 8000, anda2) optionally other polyols with a molecular weight of between 200 and 8000,b) 0.5-2.0 mol per mol of a) of a chain extender selected from the group consisting of a low-molecular weight aliphatic or cycloaliphatic diol, a low-molecular weight aliphatic or cycloaliphatic diamine, and hydrazine, andc) 1.5-3.0 mol per mol of a) of an aliphatic, cycloaliphatic or aromatic diisocyanate,

2. A coating agent according to claim 1 comprising reaction product of a) a polytetramethylene glycol-based polycarbonatediol with a molecular weight of between 600 and 3000,b) 0.5-2.0 mol per mol of a) of a chain extender selected from the group consisting of an aliphatic or cycloaliphatic diamine and hydrazine, andc) 1.5-3.0 mol per mol of a) of an aliphatic or cycloaliphatic diisocyanate,

3. A process for producing a coating on a substrate comprising applying a coating agent according to claim 1 to a substrate.

4. A process according to claim 3, wherein the coating agent is applied to the substrate by a method selected from the group consisting of printing, spraying, knife coating and transfer coating.

5. A process according to claim 3, wherein the substrate is a textile.

6. A process according to claim 3, wherein the substrate is leather.

7. A process according to claim 3, wherein the coating is a multilayer system.

8. A process according to claim 3, wherein the coating is a covering layer.

9. Substrates coated with coating agents according to claim 1.

10. Polyurethane-polyureas obtained from coating agents according to claim 1.

11. A polyurethane-polyurea made up of a) a polycarbonatediol component comprising a1) a polytetramethylene glycol-based polycarbonatediol with a molecular weight of between 400 and 8000, anda2) optionally other polyols with a molecular weight of between 200 and 8000,b) 0.5-2.0 mol per mol of a) of a chain extender selected from the group consisting of a low-molecular weight aliphatic or cycloaliphatic diol, a low-molecular weight aliphatic or cycloaliphatic diamine, and hydrazine, andc) 1.5-3.0 mol per mol of a) of an aliphatic, cycloaliphatic or aromatic diisocyanate.