Paint dispersion

• US 9,650,535 B2
• Filed: 05/06/2013
• Issued: 05/16/2017
• Est. Priority Date: 05/09/2012
• Status: Active Grant

• Current Assignee: Nouryon Chemicals International B.V. (Nouryon BV)
• Original Assignee: Akzo Nobel Chemicals International B.V. (Nouryon Coöperatief UA)
• Inventors: Greenwood, Peter Harry Johan, Lagnemo, Hans
• Primary Examiner(s): PENG, KUO LIANG
• Application Number:
  US14/397,424
• Publication Number:
  US 20150141558A1
• Time in Patent Office: 1,471 Days
• CPC Class Codes: C08K 9/04 Ingredients treated with organic substances treated with macromolecular compounds C08K9/08
• CPC Class Codes: C08L 2201/54 Aqueous solutions or dispersions
• CPC Class Codes: C09D 133/00 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 Class Codes: C09D 133/04 Homopolymers or copolymers of esters C09D143/04 takes precedence
• CPC Class Codes: C09D 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 5/028 Pigments; Filters
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds

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 SiO₂ to acrylate-based binder on a dry basis ranges from 0.02 to 0.2, and wherein the content of SiO₂, 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.

Claims

1. Aqueous paint dispersion comprising silanized colloidal silica particles, an acrylate-based binder, and polysiloxane;

wherein the weight ratio of SiO₂ to acrylate-based binder on a dry basis ranges from 0.02 to 0.2;

wherein the content of SiO₂, 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 SiO₂ content in the dispersion ranges from 1.3 to 5 wt %.

4. The dispersion of claim 3, wherein the SiO₂ content in the dispersion ranges from 1.3 to 4.5 wt %.

5. The dispersion of claim 4, wherein the SiO₂ 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 SiO₂ 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 SiO₂ 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 SiO₂, 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 SiO₂ 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.