Reaction products and aqueous basecoat materials comprising said products

Patent metadata

Field	Value
Publication number	US-2017145252-A1
Application number	US-201515322487-A
Country	US
Kind code	A1
Filing date	Apr 30, 2015
Priority date	Jul 1, 2014
Publication date	May 25, 2017
Grant date	—

Abstract

The present invention relates to a pigmented aqueous basecoat material comprising a reaction product which is preparable by reaction of
(a) at least one compound of the formula (I)

X 1 —Y—X 2   (I)
in which X 1 , X 2 independently of one another, are each a functional group which is reactive toward epoxide groups, or hydrogen, with, however, at least one of the two groups X 1 and X 2 being a functional group which is reactive toward epoxide groups, and Y is a divalent aliphatic, aromatic or araliphatic hydrocarbon radical having a number-average molecular weight of 100 to 2500 g/mol, with (b) at least one compound of the general structural formula (II)

in which
R is a C 3 to C 6 alkylene radical and n is selected accordingly such that the compound (b) possesses an epoxide equivalent weight of 100 to 2000 g/mol,
where components (a) and (b) are used in the reaction in a molar ratio of 2.3/0.7 to 1.7/1.6 and the resulting reaction product possesses a number-average molecular weight of 500 to 15 000 g/mol and an acid number of less than 10 mg KOH/g and also a hydroxyl number of 25 to 250 mg KOH/g.

First claim

1 : A pigmented aqueous basecoat material, comprising:
a reaction product which is prepared by reaction of (a) at least one compound of the formula (I)
X 1 —Y—X 2   (I)

in which X 1 , X 2 , independently of one another, are each a functional group which is reactive toward epoxide groups, or hydrogen, with, however, at least one of the two groups X 1 and X 2 being a functional group which is reactive toward epoxide groups, and Y is a divalent aliphatic, aromatic or araliphatic hydrocarbon radical having a number-average molecular weight of 100 to 2 500 g/mol,
with
(b) at least one compound of the general structural formula (II)

in which
R is a C 3 to C 6 alkylene radical and n is selected accordingly such that the compound (b) possesses an epoxide equivalent weight of 100 to 2 000 g/mol,
wherein components (a) and (b) are used in the reaction in a molar ratio of 2.3/0.7 to 1.7/1.6 and the resulting reaction product possesses a number-average molecular weight of 500 to 15 000 g/mol and an acid number of less than 10 mg KOH/g and also a hydroxyl number of 25 to 250 mg KOH/g.

2 : The basecoat material as claimed in claim 1 , wherein the compound (b) possesses an epoxide equivalent weight of 150 to 1 200 g/mol.

3 : The basecoat material as claimed in claim 1 , wherein the group R in the general structural formula (II) comprises tetramethylene radicals.

4 : The basecoat material as claimed in claim 1 , wherein the reaction product possesses a number-average molecular weight of 750 to 10 000 g/mol.

5 : The basecoat material as claimed in claim 1 , wherein dimer diols are used as compound (a).

6 : The basecoat material as claimed in claim 5 , wherein in the reaction components (a) and (b) are reacted in a molar ratio of 2.1/0.9 to 1.8/1.5.

7 : The basecoat material as claimed in claim 1 , wherein araliphatic monoalcohols are used as compound (a).

8 : The basecoat material as claimed in claim 7 , wherein in the reaction components (a) and (b) are reacted in a molar ratio of 2.1/0.9 to 2/1.

9 : The pigmented aqueous basecoat material as claimed in claim 1 , 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 %.

10 : The pigmented aqueous basecoat material as claimed in claim 1 , which comprises a polyurethane resin that is grafted with olefinically unsaturated monomers and that also comprises hydroxyl groups, and a melamine resin.

11 : A reaction product prepared by reaction of
(a) at least one compound of the formula (I)
X 1 —Y—X 2   (I)

in which X 1 , X 2 , independently of one another, are each a functional group which is reactive toward epoxide groups, or hydrogen, with, however, at least one of the two groups X 1 and X 2 being a functional group which is reactive toward epoxide groups, and Y is a divalent aliphatic, aromatic or araliphatic hydrocarbon radical having a number-average molecular weight of 100 to 2 500 g/mol,
with
(b) at least one compound of the general structural formula (II)

in which
R is a C 3 to C 6 alkylene radical and n is selected accordingly such that the compound (b) possesses an epoxide equivalent weight of 100 to 2 000 g/mol,

wherein components (a) and (b) are used in the reaction in a molar ratio of 2.3/0.7 to 1.7/1.6 and the resulting reaction product possesses a number-average molecular weight of 500 to 15 000 g/mol and an acid number of less than 10 mg KOH/g and also a hydroxyl number of 25 to 250 mg KOH/g.

12 . (canceled)

13 : A method for producing a multicoat paint system, where
(1) applying a pigmented aqueous basecoat material to a substrate, (2) forming a polymer film from the coating material applied in stage (1), (3) applying a clearcoat material to the resulting basecoat film, and then (4) curing the basecoat film is cured together with the clearcoat film, wherein a pigmented aqueous basecoat material as claimed in claim 1 is used in stage (1).

14 : The method as claimed in claim 13 , wherein the substrate is a metallic substrate coated with a cured electrocoat film, and all of the films applied to the electrocoat film are cured jointly.

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

16 : A method of improving stability of paint, the method comprising:
adding a reaction product according to claim 11 to a paint that comprises a pigment and a basecoat material.

Assignees

• Basf Coatings Gmbh

Inventors

• Steinmetz Bernhard
• Hoffmann Peter
• Reuter Hardy

Classifications

• C09J163/00

  Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins · CPC title

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• B05D7/57

  the last layer being a clear coat · CPC title

• C08G59/62

  Alcohols or phenols · CPC title

• C08G59/22

  Di-epoxy compounds · CPC title