Use of aqueous hybrid binders and alkyd systems for coating agents

Patent metadata

Field	Value
Publication number	US-9567484-B2
Application number	US-201314407290-A
Country	US
Kind code	B2
Filing date	Jun 21, 2013
Priority date	Jul 6, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

The present invention relates to aqueous hybrid binders comprising an aqueous polymer dispersion (PD), and also 0.01%-5% by weight of a photoinitiator, and also to aqueous alkyd systems comprising a water-soluble alkyd resin or an aqueous alkyd or polyurethane emulsion or dispersion, and also 0.01%-5% by weight of a photoinitiator, and to the use thereof in coating compositions, more particularly in coating materials.

First claim

The invention claimed is:

1. An aqueous hybrid binder, comprising:
(A) from 0.01%-5% by weight of a photoinitiator, based on 100% of the binder; and
(B) an aqueous polymer dispersion (PD) comprising a polymer (P) and an alkyd-containing component,
wherein:
the polymer (P) comprises, in polymerized form, an α,β-ethylenically unsaturated monomer (M), and optionally a further monomer (M1):
the alkyd containing component is (a) a water-soluble alkyd resin having a weight-average molecular weight of between 5000 and 40 000 Da, (b) an aqueous alkyd emulsion or dispersion, or (c) a polyurethane-alkyd emulsion or dispersion; and
the aqueous polymer dispersion is obtained by a process comprising
performing free-radical emulsion polymerization of the α,β-ethylenically unsaturated monomer (M), and optionally the further monomer (M1), to obtain the polymer (P),
optionally performing a subsequent chemical deodorization, and
adding the water-soluble alkyd resin having a weight-average molecular weight of between 5000 and 40 000 Da, or adding the aqueous alkyd emulsion or dispersion, or adding the polyurethane-alkyd emulsion or dispersion, wherein the addition of the alkyd resin, the alkyd emulsion or dispersion, or the polyurethane-alkyd emulsion or dispersion takes place alternatively

(i) directly subsequent to the polymerization of M and M1, and optionally the chemical deodorization, at room temperature,
(ii) subsequent to the polymerization of M and M1, with an after stir time of 0-2 h, or
(iii) subsequent to the chemical deodorization, with an after stir time of 0-2 h, wherein a temperature of addition according to (ii) or (iii) is from 60 to 99° C.

2. The aqueous hybrid binder according to claim 1 , wherein the photoinitiator is added to the aqueous polymer dispersion which has been cooled to room temperature (23° C.).

3. The aqueous hybrid binder according to claim 1 , wherein the process comprises performing the free-radical emulsion polymerization of the α,β-ethylenically unsaturated monomer (M) and the further monomer (M1) which is at least one combination of monomers selected from the group consisting of:
n-butyl acrylate, and methyl methacrylate;
n-butyl acrylate, methyl methacrylate, and styrene;
n-butyl acrylate, styrene, and butyl (meth)acrylate;
n-butyl acrylate, ethylhexyl acrylate, and styrene;
n-butyl acrylate, and styrene; and
n-butyl acrylate, n-butyl (meth)acrylate, and methyl methacrylate.

4. The aqueous hybrid binder according to claim 3 , wherein the process comprises performing the free-radical emulsion polymerization of the α,β-ethylenically unsaturated monomer (M), the further monomer (M1), and at least one monomer (M2) selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, methacrylamide, acetoacetoxyethyl (meth)acrylate, 2-ureido methacrylate, a methoxypolyethylene glycol monomethacrylate, and a mixture thereof.

5. The aqueous hybrid binder according to claim 1 , wherein the aqueous polymer dispersion (PD) comprises 5-60% by weight of the water-soluble alkyd resin, or the aqueous alkyd emulsion or dispersion, or the polyurethane-alkyd emulsion or dispersion, based on a total weight of the aqueous hybrid binder.

6. The aqueous hybrid binder according to claim 1 , wherein the aqueous polymer dispersion (PD) is an acrylate-alkyd polymer dispersion (PD) comprising an acrylate portion having a glass transition temperature of less than 50° C. but greater than 20° C.

7. An aqueous alkyd system, comprising the aqueous hybrid binder according to claim 1 , wherein the photoinitiator is added to the aqueous polymer dispersion which has been cooled to room temperature (23° C.).

8. A coating composition in the form of an aqueous composition, comprising:
water;
the aqueous hybrid binder of claim 1 ;
optionally an inorganic filler, an inorganic pigment, or both; and
an auxiliary.

9. A coating composition in the form of an aqueous composition, comprising:
water;
the aqueous alkyd system of claim 7 ;
optionally at least one inorganic filler, inorganic pigment, or both; and
an auxiliary.

10. The coating composition according to claim 8 , wherein the composition is a coating material.

11. A process for preparing an aqueous hybrid binder by preparing an aqueous polymer dispersion (PD), the process comprising:
performing by free-radical emulsion polymerization of an α,β-ethylenically unsaturated monomer (M), and optionally a further monomer (M1), to obtain a polymer (P);
optionally performing a subsequent chemical deodorization;
adding a water-soluble alkyd resin having a weight-average molecular weight of between 5000 and 40 000 Da, or adding an aqueous alkyd or polyurethane-alkyd emulsion, wherein the addition of the alkyd resin, alkyd or polyurethane-alkyd emulsion or dispersion takes place alternatively
(i) directly subsequent to the polymerization of M and M1, and optionally the chemical deodorization, at room temperature,
(ii) subsequent to the polymerization of M and M1, with an after stir time of 0-2 h, or
(iii) subsequent to the chemical deodorization, with an after stir time of 0-2 h,

wherein a temperature of addition according to (ii) or (iii) is from 60 to 99° C.; and
adding 0.01%-5% by weight of a photoinitiator.

12. A process, comprising applying the aqueous hybrid binder of claim 1 as a binder in a coating material.

13. A process, comprising applying the aqueous alkyd system of claim 7 in a coating material.

14. The process according to claim 12 , wherein the coating material is a transparent varnish or an emulsion paint.

15. The process according to claim 12 , wherein the coating material is a high-gloss transparent varnish or a high-gloss emulsion paint.

16. A method of increasing development of early hardness in a coating, the method comprising adding the aqueous hybrid binder of claim 1 in the coating.

17. A method for increasing development of early hardness in a coating, the method comprising adding the aqueous alkyd system of claim 7 in the coating.

Assignees

• Basf Se

Inventors

• Roller Sebastian
• Wiese Harm
• Balk Roelof

Classifications

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09D167/08

  Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids · CPC title

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D7/61

  inorganic · CPC title