Aqueous coating composition with improved stability

Patent metadata

Field	Value
Publication number	US-9303182-B2
Application number	US-201214405835-A
Country	US
Kind code	B2
Filing date	Jun 5, 2012
Priority date	Jun 5, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

This invention relates to a coating composition, especially, relates to an aqueous coating composition with improved stability.

First claim

The invention claimed is:

1. An aqueous coating composition comprising:
i) a stable aqueous dispersion of polymer particles having structural units of an ethylenically unsaturated nonionic monomer;
ii) from 5% to 50% by dry weight based on the total weight of the coating composition, of at least one pigment, wherein the pigment comprises from 30% to 100% based on the total weight of the pigment, of a polymer-encapsulated pigment comprising an encapsulating polymer comprising structural units of an ethylenically unsaturated nonionic monomer, and in percentage by weight based on the dry weight of the encapsulating polymer, from 0.1% to 10% of structural units of an ethylenically unsaturated monomer with at least one functional group selected from the group consisting of carboxyl, carboxylic anhydride, hydroxyl, amide, amine, sulphonate, phosphonate and mixtures thereof; wherein the polymer-encapsulated pigment has an average shell thickness of 10 nanometers to 200 nanometers and a minimum film formation temperature (MFFT) from −35° C. to 60° C.; and
iii) from 2% to 25% by dry weight based on the total weight of the coating composition, of at least one colloidal silica.

2. The aqueous coating composition according to claim 1 , wherein the encapsulating polymer further comprises, from 0.1% to 5% by dry weight of the encapsulating polymer, of at least one surfactant.

3. The aqueous coating composition according to claim 1 , wherein the pigment is an inorganic pigment.

4. The aqueous coating composition according to claim 1 , wherein the pigment is TiO 2 , and at least 30% of the said TiO 2 is polymer encapsulated.

5. The aqueous coating composition according to claim 1 , wherein the colloidal silica is derived from precipitated silica, micro silica, pyrogenic silica, silica gels, or a mixture thereof.

6. The aqueous coating composition according to claim 1 , wherein the pigment is an inorganic pigment.

7. The aqueous coating composition according to claim 6 , wherein the pigment is TiO 2 , and at least 30% of the said TiO 2 is polymer encapsulated.

8. The aqueous coating composition according to claim 1 , wherein the pigment is an inorganic pigment.

9. The aqueous coating composition according to claim 8 , wherein the pigment is TiO 2 , and at least 30% of the said TiO 2 is polymer encapsulated.

10. The aqueous coating composition according to claim 1 , wherein the pigment is an inorganic pigment.

11. The aqueous coating composition according to claim 10 , wherein the pigment is TiO 2 , and at least 30% of the said TiO 2 is polymer encapsulated.

12. The aqueous coating composition according to claim 2 , wherein the pigment is an inorganic pigment.

13. The aqueous coating composition according to claim 12 , wherein the pigment is TiO 2 , and at least 30% of the said TiO 2 is polymer encapsulated.

Assignees

• Wang Tao
• Chen Junyu
• Wang Tao
• Wang Yujiang
• Cui Longlan
• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Wang Tao
• Chen Junyu
• Wang Tao
• Wang Yujiang
• Cui Longlan

Classifications

• C09D125/14

  with unsaturated esters · CPC title

• C09D131/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08K3/22

  of metals · CPC title

• C09D151/003 Primary

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C09D151/04, C09D151/06 take precedence) · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title