Aqueous coating composition

Patent metadata

Field	Value
Publication number	US-9850396-B2
Application number	US-201314896191-A
Country	US
Kind code	B2
Filing date	Jun 21, 2013
Priority date	Jun 21, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An aqueous coating composition capable of providing coating films with balanced properties of low gloss, high clarity, and good water resistance and alcohol resistance, and a process of making and using such aqueous coating composition.

First claim

What is claimed is:

1. An aqueous coating composition comprising, based on the total weight of the coating composition,
(a) 1-40 wt % of a polymer binder,
(b) 0.5-2 wt % of a first matting agent having a specific surface area larger than 100 square meters per gram according to ASTM D1993-03(2008) method,
(c) 1-6 wt % of a second matting agent having a specific surface area smaller than 5 square meters per gram according to ASTM D1993-03(2008) method,
(d) 0.1-1 wt % of an epoxy silane, and
(e) 0.5-6 wt % of a wax.

2. The aqueous coating composition of claim 1 , wherein the wax comprises paraffin wax, polyethylene wax, or a mixture thereof.

3. The aqueous coating composition of claim 1 , wherein the wax has an average particle size of no more than 4.5 microns according to ASTM E2651-10 method.

4. The aqueous coating composition of claim 1 , wherein the coating composition comprises 0.8-1.5 wt % of the first matting agent, 1.5-5.5 wt % of the second matting agent, 0.1-0.6 wt % of the epoxy slime, and 0.8-5 wt % of the wax.

5. The aqueous coating composition of claim 1 , wherein the first matting agent has a specific surface area of 150-350 square meters per gram.

6. The aqueous coating composition of claim 1 , wherein the first matting agent is selected from a silica matting agent, a polyurea matting agent, or mixtures thereof.

7. The aqueous coating composition of claim 1 , wherein the second matting agent has a specific surface area of 0.1-4 square meters per gram.

8. The aqueous coating composition of claim 1 , wherein the second matting agent is selected from a polyacrylate matting agent; a polyethylene matting agent, a polytetrafluoroethene matting agent, or a mixture thereof.

9. The aqueous coating composition of claim 1 , wherein the epoxy silane is selected from an epoxy silane oligomer; 3-glycidoxypropyltrimethoxysilane; 3-glycidoxypropylmethyldiethoxysilane; 3-glycidoxypropyltriethoxysilane; beta-(3,4-epoxycyclohexyl)ethyltriethoxysilane; or mixtures thereof.

10. The aqueous coating composition of claim 1 , wherein the wax has an average particle size of 2 microns or less.

11. The aqueous coating composition of claim 1 , wherein the polymer binder is selected from an acrylic copolymer, polyurethane, or mixtures thereof.

12. The aqueous coating composition of claim 11 , wherein the acrylic copolymer comprises a copolymerized ethylenically unsaturated monomer having a functional group selected from carbonyl, acetoacetate, alkoxysilane, carboxyl, ureido, amide, imide, amino group, or mixtures thereof.

13. The aqueous coating composition of claim 1 , further comprising at least one of water, solvents, a wetting agent, a defoamer, a thickener.

14. An aqueous coating composition comprising, based on the total weight of the coating composition,
(a) 12-35 wt % of an acrylic copolymer comprising a copolymerized ethylenically unsaturated monomer having a functional group selected from carbonyl, acetoacetate, alkoxysilane, carboxyl, ureido, amide, imide, amino group, or mixtures thereof;
(b) 0.8-1.2 wt. % of a first matting agent selected from silica, polyurea, or mixtures thereof,
(c) 2-5 wt % of a second matting agent selected from a polyacrylate matting agent, a polyethylene matting agent, a polytetrafluoroethene matting agent, or mixtures thereof;
(d) 0.2-0.4 wt % of an epoxy silane selected from an epoxy silane oligomer, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, beta-(3,4-epoxycyclohexyl)ethyltriethoxysilane, or a mixture thereof;
(e) 1-3 wt % of a wax comprising paraffin wax, polyethylene wax, or mixtures thereof; wherein the wax has an average particle size of no more than 1.4 microns according to ASTM E2651-10 method;
(f) 40-70 wt % water;
(g) 0-8 wt % solvent; and
(h) 0-1 wt % a crosslinking agent.

15. A process of using the aqueous coating composition of claim 1 comprising:
applying the coating composition to a substrate, and
drying the applied coating composition;
wherein the coating after drying the coating composition applied to the substrate has a gloss level of no more than 20 on a 60° Gardner Gloss scale; a clarity value of at least 30%, and a water-resistance level of at least 4 and a 48% alcohol-resistance level of at least 4 according to BS: EN12720:2009 method.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Xu Yawei
• Zhan fu
• Yang Xiaohong
• Zheng Baoqing
• Shen Biao
• Yang Yurun

Classifications

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D7/63

  organic · CPC title

• C08K3/36

  Silica · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C09D5/024

  characterised by the additives · CPC title