Paint dispersion

Patent metadata

Field	Value
Publication number	US-9650535-B2
Application number	US-201314397424-A
Country	US
Kind code	B2
Filing date	May 6, 2013
Priority date	May 9, 2012
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

The invention relates to a method of providing an aqueous paint dispersion comprising silanized colloidal silica particles and an acrylate-based binder wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2, and wherein the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %, wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof. The invention also relates to the use thereof.

First claim

The invention claimed is:

1. Aqueous paint dispersion comprising silanized colloidal silica particles, an acrylate-based binder, and polysiloxane;
wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2;
wherein the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %;
wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof;
wherein the polysiloxane is present in an amount of 0.05 to 2 wt %; and
wherein the colloidal silica particles are prepared by polymerization of polysilicic acid originating from water glass.

2. The dispersion of claim 1 wherein the dispersion remains stable for at least 12 months at a temperature from 15 to 25° C.

3. The dispersion of claim 1 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 5 wt %.

4. The dispersion of claim 3 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 4.5 wt %.

5. The dispersion of claim 4 , wherein the SiO 2 content in the dispersion ranges from 2 to 3 wt %.

6. The dispersion of claim 1 , wherein the total dry content in the dispersion ranges from 45 to 75 wt %.

7. The dispersion of claim 1 , wherein the silane group of the silanized colloidal silica particles is derived from an epoxy silane.

8. The dispersion of claim 6 , wherein the total dry content in the dispersion ranges from 50 to 65 wt %.

9. The dispersion of claim 1 , wherein the content of SiO 2 is measured by XRF using a Philips Magix PW2424 spectrometer.

10. A method for painting of bricks, minerals, wood, metal surfaces, plastics, ceramics, cementitious materials, glass, or porcelain comprising the step of applying the paint dispersion of claim 1 to bricks, minerals, wood, metal surfaces, plastics, ceramics, cementitious materials, glass, or porcelain.

11. Method of preparing an aqueous paint dispersion comprising mixing silanized colloidal silica particles, an acrylate-based binder and a polysiloxane;
wherein the weight ratio of SiO 2 to acrylate-based binder on a dry basis ranges from 0.02 to 0.2;
wherein silanized colloidal silica particles is mixed in such amount that the content of SiO 2 , measured by XRF, in said dispersion ranges from 1.05 to 7.5 wt %;
wherein silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group, glycidoxy group, glycidoxypropyl group, ureido-based silanes, methacrylamido silanes, mercapto silanes, and combinations thereof;
wherein the polysiloxane is present in an amount of 0.05 to 2 wt %; and
wherein the colloidal silica particles are prepared by polymerization of polysilicic acid originating from water glass.

12. The method of claim 11 , wherein the SiO 2 content in the dispersion ranges from 1.3 to 5 wt %.

13. The method of claim 11 , wherein the total dry content of the dispersion ranges from 45 to 75 wt %.

14. The method of claim 11 , wherein the silane groups present in the silanized colloidal silica particles are derived from silanes containing an epoxy group.

Assignees

• Akzo Nobel Chemicals Int Bv

Inventors

• Greenwood Peter Harry Johan
• Lagnemo Hans

Classifications

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• C09D7/62 Primary

  modified by treatment with other compounds · CPC title

• C09D5/028 Primary

  Pigments; Filters · CPC title

• C08L2201/54

  Aqueous solutions or dispersions · CPC title

• C09D133/00

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title