Dimer fatty acid-polyether-reaction product and coating composition comprising the reaction product

Patent metadata

Field	Value
Publication number	US-2016200863-A1
Application number	US-201414913141-A
Country	US
Kind code	A1
Filing date	Jul 17, 2014
Priority date	Aug 27, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention relates to a reaction product preparable by reacting
(a) dimer fatty acids with

(b) at least one polyether of the general structural formula (I)

where R is a C 3 to C 6 alkylene radical and n correspondingly is selected such that said polyether possesses a number-average molecular weight of 2250 to 6000 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.6/1.7, and the resulting reaction product possesses a number-average molecular weight of 4800 to 40000 g/mol and an acid number of less than 10 mg KOH/g. The invention further relates to a pigmented aqueous basecoat material which comprises this reaction product, and to the use of the reaction product in pigmented aqueous basecoat materials for improving adhesion. The present invention further relates to a method for producing multicoat paint systems, and also to the multicoat paint systems producible by means of said method.

First claim

1 . A dimer fatty acid-polyether-reaction product preparable by reacting
(a) dimer fatty acids) with (b) at least one polyether of the general structural formula (I):

where R is a C 3 to C 6 alkylene radical and n correspondingly is selected such that the polyether (b) possesses a number-average molecular weight of 2250 to 6000 g/mol,
wherein components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.6/1.7, and the resulting reaction product possesses a number-average molecular weight of 4800 to 40000 g/mol and an acid number of less than 10 mg KOH/g.

2 . The reaction product as claimed in claim 1 , wherein the dimer fatty acids used consist of at least 90 wt % of dimeric molecules, less than 5 wt % of trimeric molecules, and less than 5 wt % of monomeric molecules and other byproducts.

3 . The reaction product as claimed in claim 1 , wherein the polyether (b) possesses a number-average molecular weight of 2400 to 5200 g/mol.

4 . The reaction product as claimed in claim 1 , wherein the group R as per the general structural formula (I) comprises isopropylene radicals or tetramethylene radicals and the polyether (b) possesses a number-average molecular weight of 2500 to 4800 g/mol.

5 . The reaction product as claimed in claim 1 , wherein components (a) and (b) are used in a molar ratio of 0.9/2.1 to 1.5/1.8.

6 . The reaction product as claimed in claim 1 , which possesses a number-average molecular weight of 5000 to 30000 g/mol.

7 . A pigmented aqueous basecoat material which comprises at least one reaction product as claimed in claim 1 .

8 . The pigmented aqueous basecoat material as claimed in claim 7 , wherein the sum total of the weight-percentage fractions, based on the total weight of the pigmented aqueous basecoat material, of all the reaction products is 0.1 to 30 wt %.

9 . The pigmented aqueous basecoat material as claimed in claim 7 , which comprises as further binder at least one polyurethane resin.

10 . The pigmented aqueous basecoat material as claimed in claim 7 , which comprises a polyurethane resin that is grafted by means of olefinically unsaturated monomers and that also comprises hydroxyl groups, and a melamine resin.

11 . A method for improving adhesion comprising incorporating the reaction product of claim 1 into a pigmented aqueous basecoat material.

12 . A method for producing a multiple-coat paint system, where
(1) a pigmented aqueous basecoat material is applied to the substrate, (2) a polymer film is formed from the coating material applied in stage (1), (3) a clearcoat material is applied to the resulting basecoat film, and subsequently (4) the basecoat film is cured together with the clearcoat film,
wherein a pigmented aqueous basecoat material is used in stage (1).

13 . The method as claimed in claim 12 , wherein the substrate from stage (1) is a multicoat paint system which possesses defects.

14 . A multicoat paint system producible by the method as claimed in claim 12 .

15 . A multicoat paint system producible by the method as claimed in claim 13 .

Assignees

• Basf Coatings Gmbh

Inventors

• Steinmetz Bernhard
• Hoffmann Peter
• Reuter Hardy

Classifications

• C09D175/04 Primary

  Polyurethanes · CPC title

• C08G63/676 Primary

  in which at least one of the two components contains aliphatic unsaturation · CPC title

• C09D151/08

  grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09D167/025

  containing polyether sequences · CPC title

• C08G18/4891

  modified with higher fatty oils or their acids or by resin acids · CPC title