Mixer system for producing aqueous coating materials

Patent metadata

Field	Value
Publication number	US-2024240032-A1
Application number	US-202218557686-A
Country	US
Kind code	A1
Filing date	May 17, 2022
Priority date	May 28, 2021
Publication date	Jul 18, 2024
Grant date	—

Abstract

Disclosed herein is a mixer system for producing aqueous coating materials including, within an aqueous mixing clear component B, an aqueous dispersion including an acrylic-based multi-stage emulsion polymer including silane functionality. Further disclosed herein is a method of producing a coating material from the mixer system as well as a method of producing a coating layer from the coating material.

First claim

1 . A mixer system for producing aqueous coating materials from at least one aqueous pigment paste A,
the at least one aqueous pigment paste A comprising at least one color pigment and at least one aqueous mixing clear resin component B, wherein the at least one mixing clear resin component B comprises at least one aqueous dispersion (wD) comprising an acrylic-based multi-stage emulsion polymer, wherein the acrylic-based multi-stage emulsion polymer is produced by successive radical emulsion polymerization of at least two mixtures (M) of olefinically unsaturated monomers, wherein the mixture (M) applied in the last step of emulsion polymerization comprises at least one silane-containing olefinically unsaturated monomer.

2 . The mixer system according to claim 1 , wherein the pigment paste A comprises at least one anionically stabilized binder (a-2) and/or at least one nonionically stabilized binder (a-3).

3 . The mixer system according to claim 1 , wherein the anionically stabilized binder (a-2) of the pigment paste A is an anionically stabilized polyurethane polymer in dispersion in water, wherein the anionically stabilized polyurethane polymer has an acid number in a range of from 20 to 40 mg KOH/g, based on the solids content, wherein the dispersion has a pH in a range of from 7.0 to 8.0, and wherein the dispersion comprises a polyol that has an average molar mass in a range of from 500 to 1500 Da.

4 . The mixer system according to claim 2 , wherein the nonionically stabilized binder (a-3) of the pigment paste A is a nonionically stabilized acrylate copolymer in dispersion in water, and the nonionically stabilized acrylate copolymer is obtainable by reaction of
(I) at least one anchor group monomer unit having at least one ionizable functional group, a functional group with active hydrogen, or a combination thereof, wherein:
the ionizable functionality is other than a carboxylic acid group in which the carbonyl carbon is separated from the closest ethylenically unsaturated carbon by at least four atoms,
the anchor group of monomer units (a) contains no polyoxyalkylene groups, and
one of the anchor group monomer units is copolymerized 1-(2-methacryloyloxyethyl)-2-imidazolidinone:
(II) 5 wt % to 45 wt %, based on the total weight of the monomers, of at least one monomer unit comprising a polyoxyalkylene group, a gamma-hydroxycarbamate group, a beta-hydroxy carbamate group, or a combination thereof; and (III) 1 wt % to 50 wt %, based on the total weight of the monomers, of at least one aromatic monomer unit.

5 . The mixer system according to claim 1 , wherein the at least one aqueous mixing clear resin component B further comprises at least one acrylate-based microgel dispersion (b-1), wherein the acrylate-based microgel dispersion has a glass transition temperature T g of from 50° C. to 60° C.

6 . The mixer system according to claim 1 , wherein the preparation of the acrylic-based multi-stage emulsion polymer comprised in the aqueous dispersion (wD) encompasses the successive radical emulsion polymerization of three mixtures (MA), (MB), and (MC) of olefinically unsaturated monomers.

7 . The mixer system according to claim 1 , wherein the silane containing olefinically unsaturated monomer comprises, as the olefinically unsaturated moiety, a (meth)acrylate function, an allyl group, or a vinyl group.

8 . The mixer system according to claim 1 , wherein the silane containing olefinically unsaturated monomer is described by the general formula (I)
[X-SiR 1 a (OR 2 ) 3-a ]  (I)

wherein
X represents a group having an olefinically unsaturated group and being bound to the silicon via a carbon atom,
R 1 represents an alkyl, cycloalkyl, aryl, or aralkyl group, wherein the carbon chain may be interrupted by nonadjacent oxygen, sulfur, or NR a groups, wherein R a is alkyl, cycloalkyl, aryl, or aralkyl;
R 2 represents hydrogen or an alkyl or cycloalkyl group, wherein the carbon chain may be interrupted by nonadjacent oxygen, sulfur or NR a groups, wherein R a is alkyl, cycloalkyl, aryl, or aralkyl; and
a is 0, 1 or 2.

9 . The mixer system according to claim 1 , wherein R 1 and R 2 are, independently from each other, a C 1 -C 6 alkyl group.

10 . The mixer system according to claim 1 , wherein the amount of silane containing olefinically unsaturated monomer applied in the last step of emulsion polymerization is in the range of from 30 wt % to 80 wt %, based on the total amount of monomers of the mixture (M) applied in the last step of emulsion polymerization.

11 . A method for producing an aqueous coating material by mixing at least two aqueous components, the method comprising using the mixer system according to claim 1 is and applying and thus mixing at least one pigment paste A and at least one mixing clear resin component B.

12 . An aqueous coating material based on the mixing system according to claim 1 , wherein the aqueous coating material contains, in intermixed form, at least two aqueous components, wherein at least one component is a pigment paste A and at least one further component is a mixing clear resin component B of the mixing system.

13 . A method of producing a coating layer on a substrate comprising applying the aqueous coating material according to claim 12 onto the substrate and subsequently drying the applied coating material.

14 . The method according to claim 13 , wherein the drying step is conducted at a temperature of below 80° C.

15 . The method according to claim 13 , further comprising, after applying the coating material, applying a clearcoat material onto the applied coating material and curing together both the applied coating material and the applied clearcoat material.

16 . The method according to claim 15 , wherein a silane-based clearcoat material is applied as clear coat material.

17 . The method according to claim 13 , wherein the substrate is a multilayer coating system having damaged sides.

18 . A multicoat system prepared according to claim 13 .

19 . The mixer system according to claim 3 , wherein the dispersed polyol is polypropylene glycol.

20 . The method according to claim 14 , wherein the drying step is conducted at a temperature of below: 40° C.

Assignees

• Basf Coatings Gmbh

Inventors

• Lueckert Jens
• Foelling Frederik
• Machaczek Peter
• Diepenbrock Vera
• Hoevelmann Claas Henrik
• Schnieders Britta
• Winsberg Jan
• Glomb Melanie
• Focke Thomas

Classifications

• C09D175/06

  from polyesters · CPC title

• C09D7/45

  Anti-settling agents · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• C08L75/06

  from polyesters · CPC title

• C08G18/0823

  containing carboxylate salt groups or groups forming them · CPC title