Polymer in multicoat color and/or effect paint systems

Patent metadata

Field	Value
Publication number	US-10358520-B2
Application number	US-201515121701-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Feb 26, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The present invention relates to a polymer, preparable by reacting
at least one polymer, preparable by reacting (a) dimer fatty acids with at least (b) one polyether having a C3 to C6 alkylene radical and a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number <10 mg KOH/a, at least one polyether with a C3 to C6 alkylene radical and with a number-average molecular weight of 250 to 3000 g/mol, at least one compound having at least one anionic group and/or at least one functional group capable of forming anions, and at least one, more particularly at least two, isocyanate-reactive functional groups, at least one polyisocyanate, and optionally at least one monool or diol, at least one compound having more than two isocyanate-reactive functional groups, and optionally neutralizing the groups of component (C) that are capable of forming anions.

First claim

The invention claimed is:

1. A polymer obtained by reacting:
(A) at least one polymer, prepared by reacting:
(a) at least one dimer fatty acid, with
(b) at least one polyether of formula (I):

wherein:
R is a C 3 to C 6 alkylene radical,
n is selected so that said polyether has a number-average molecular weight of 450 to 2,200 g/mol,
a molar ratio of the components (a) and (b) is 0.7/2.3 to 1.3/1.7, and n
the polymer (A) has a number-average molecular weight of 1,500 to 5,000 g/mol and an acid number less than 10 mg KOH/g;

(B) at least one polyether of formula (II):

wherein
R is a C 3 to C 6 alkylene radical, and
n is selected so that said polyether (B) has a number-average molecular weight of 250 to 3,000 g/mol;

(C) at least one compound having at least one anionic group, at least one functional group capable of forming anions, or both and having at least one isocyanate-reactive functional group, wherein the compound (C) is different from the polyether (A) and the polyether (B);
(D) at least one polyisocyanate;
(E) optionally at least one monool or diol which is different from the polyether (A), the polyether (B) and the compound (C); and
(F) at least one compound having more than two isocyanate-reactive functional groups, wherein the compound (F) is different from the polyether (A), the polyether (B) and the compound (C), and optionally neutralizes the at least one anionic group of the compound (C) that is capable of forming anions.

2. The polymer according to claim 1 , wherein the at least one dimer fatty acid (a) comprises at least 90% by weight of dimeric molecules, less than 5% by weight of trimeric molecules, and less than 5% by weight of monomeric molecules and other by-products.

3. The polymer according to claim 1 , wherein said polyether of formula (I) is a polypropylene glycol or a polytetrahydrofuran and has a number-average molecular weight of 800 to 1,200 g/mol.

4. The polymer according to claim 1 , wherein said polyether of formula (II) is a polypropylene glycol or a polytetrahydrofuran and has a number-average molecular weight of 1,800 to 2,200 g/mol.

5. The polymer according to claim 1 , wherein a molar ratio of the dimer fatty acid (a) and the polyether (b) is 0.9/2.1 to 1.1/1.9.

6. The polymer according to claim 1 , which has a number-average molecular weight of 5,000 to 50,000 g/mol.

7. The polymer according to claim 1 , which has an acid number of less than 50 mg KOH/g.

8. A pigmented aqueous basecoat material, comprising at least one polymer according to claim 1 .

9. The pigmented aqueous basecoat material according to claim 8 , wherein the sum total of the weight-percentage fractions, based on the total weight of the pigmented aqueous basecoat material, of all polymers is 0.1% to 30% by weight.

10. The pigmented aqueous basecoat material according to claim 8 , further comprising, as a further binder, at least one further polyurethane resin which is different from said at least one polymer.

11. A method for promoting adhesion, the method comprising:
incorporating the polymer according to claim 1 into a pigmented aqueous basecoat material; and
forming a polymer film of the pigmented aqueous basecoast material adhered to a surface of a substrate.

12. A method for producing a multicoat paint system, the method comprising:
(1) applying the pigmented aqueous basecoat material according to claim 8 to a substrate;
(2) forming a basecoat polymer film from the pigmented aqueous basecoat material applied in step (1);
(3) applying a clearcoat film to the basecoat polymer film; and subsequently
(4) curing the basecoat polymer film together with the clearcoat film.

13. The method according to claim 12 , wherein said substrate is a multicoat paint system which has defect areas.

14. A multicoat paint system obtained by the method according to claim 12 .

15. A multicoat paint system obtained by the method according to claim 13 .

Assignees

• Basf Coatings Gmbh

Inventors

• Lettmann Bernhard
• Hoffmann Peter
• Jasper Raphaela
• Kuhn Kai
• Kemper Heinz-Juergen
• Siegert Marion

Classifications

• C08G18/4854 Primary

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C08G18/4063 Primary

  Mixtures of compounds of group C08G18/62 with other macromolecular compounds · CPC title

• C08G18/12

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

• C08G18/4252

  derived from polyols containing polyether groups and polycarboxylic acids · CPC title