Aqueous polyurethaneurea dispersion containing free acid groups

Patent metadata

Field	Value
Publication number	US-10087294-B2
Application number	US-201615058642-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Mar 6, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

The present invention relates to an aqueous polyurethaneurea dispersion, wherein the polyurethaneurea has specific formation components, and which is characterized in that it has a content of —COOH groups of at least 0.75% by weight, where 0% to 35% of these groups have been neutralized, and in that 5 to 50 mol % of isocyanate groups present have been reacted with a monofunctional component. The invention further relates to the use of this dispersion as coating composition, to a fiber having a cured coating and to a composite material.

First claim

The invention claimed is:

1. An aqueous polyurethaneurea dispersion, the polyurethaneurea comprising at least the following components as formation components:
A) at least one polyisocyanate compound having a functionality of ≤2,
B) at least one polyol,
C) at least one formation component which differs from components B), D) and, if present, component E) and which has at least one group reactive toward isocyanate groups and at least one —COOH group, and
D) at least one nonionic hydrophilizing agent having at least one group reactive toward isocyanate groups, and
E) optionally at least one monofunctional compound reactive toward isocyanate groups which is different from C) and D) and does not have any unsaturated groups or epoxy groups,
wherein
the polyurethaneurea has a content of —COOH groups of 0.75% to 7.50% by weight in relation to the total weight of the polyurethaneurea in the dried state and 0% to 10% of these —COOH groups have been neutralized, and
wherein 5 to 50 mol % of the isocyanate groups of component A) have been reacted with a monofunctional component selected from the group consisting of one of components C), D), E), and the sum total of a mixture of components C), D) and E), and
wherein, when neither component C) nor component D) is monofunctional, component E) is necessarily present as formation component.

2. The aqueous polyurethaneurea dispersion according to claim 1 , wherein 20 to 48 mol % of the isocyanate groups of component A) have been reacted with a monofunctional component selected from the group consisting of one of components C), D), E), and the sum total of a mixture of components C), D) and E), and wherein, when neither component C) nor component D) is monofunctional, component E) is necessarily present as formation component.

3. The aqueous polyurethaneurea dispersion according to claim 1 , wherein the polyurethaneurea has a content of —COOH groups of 1.00% to 5.00% by weight in relation to the total weight of the polyurethaneurea in the dried state.

4. The aqueous polyurethaneurea dispersion according to claim 1 , wherein component C) is selected from the group consisting of monohydroxycarboxylic acids, dihydroxycarboxylic acids, dihydroxydicarboxylic acids, trihydroxycarboxylic acids, monoaminocarboxylic acids, diaminocarboxylic acids, triaminocarboxylic acids, and mixtures thereof.

5. The aqueous polyurethaneurea dispersion according to claim 1 , wherein component D) is a monofunctional polyethylene glycol-containing component wherein the proportion of polyethylene glycol is at least 50% by weight and which has a molar mass Mn 1200 g/mol to 3000 g/mol.

6. The aqueous polyurethaneurea dispersion according to claim 1 , wherein component B) is at least one aliphatic polyester polyol.

7. A method for preparing a coating composition comprising utilizing the aqueous polyurethaneurea dispersion according to claim 1 .

8. The method of claim 7 , wherein the coating composition is a glass fibre size.

9. An aqueous coating composition comprising at least one aqueous polyurethaneurea dispersion according to claim 1 and at least one of auxiliary and/or additive.

10. A process for producing a coated fibre comprising
(i) providing at least one fibre;
(ii) applying the aqueous coating composition according to claim 9 to at least a portion of a surface of the at least one fibre from (i), forming an at least partly coated fibre, and
(iii) curing the coating of the at least partly coated fibre from (ii).

Assignees

• Covestro Deutschland Ag

Inventors

• Grablowitz Hans G
• Feller Thomas
• Kreuter Martin
• Janssen Petra
• Gipperich Ingo

Classifications

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08G18/12

  using two or more compounds having active hydrogen in the first polymerisation step · CPC title

• C08J5/08 Primary

  glass fibres · CPC title

• C03C25/326

  Polyureas; Polyurethanes · CPC title

• C08G18/722

  Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates · CPC title