Aqueous silanized silica dispersion

Patent metadata

Field	Value
Publication number	US-9187647-B2
Application number	US-201013254980-A
Country	US
Kind code	B2
Filing date	Mar 10, 2010
Priority date	Mar 13, 2009
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

The present invention relates to a method of producing an aqueous dispersion of silanized colloidal silica particles comprising mixing in an aqueous medium a) at least one silane compound containing an epoxy-functionality, b) at least one silane compound having no epoxy-functionality capable of modifying colloidal silica particles; and c) colloidal silica particles in any order to form an aqueous dispersion of silanized colloidal silica particles containing silane compounds originating from a) and b). It also relates to a dispersion obtainable by said method and to the use thereof in coating applications.

First claim

The invention claimed is:

1. A method of producing an aqueous dispersion of silanized colloidal silica particles comprising mixing in an aqueous medium a) at least one silane compound containing an epoxy-functionality, b) at least one silane compound having no epoxy-functionality capable of modifying colloidal silica particles and comprising at least one of an amido-functionality or an ureido-functionality, and c) colloidal silica particles having an average particle diameter ranging from about 3 to about 50 nm in any order to form an aqueous dispersion of silanized colloidal silica particles containing silane compounds originating from a) and b), wherein the weight ratio of a) and b) to silica is from about 0.01 to about 0.5 and the silica content in the dispersion is from about 20 to about 80 wt %.

2. The method according to claim 1 , wherein the silanized colloidal silica particles are capable of imparting hardness and/or water resistance to lacquers.

3. The method according to claim 1 , wherein the weight ratio of b) to a) is from about 2 to about 0.1.

4. The method according to claim 1 , further comprising mixing the aqueous dispersion with a lacquer.

5. The method according to claim 2 , wherein the weight ratio of b) to a) is from about 2 to about 0.1.

6. The method according to claim 4 , wherein the weight ratio of b) to a) is from about 2 to about 0.1.

7. The method according to claim 2 , further comprising mixing the aqueous dispersion with a lacquer.

8. An aqueous dispersion obtained by the method according to claim 1 .

9. An aqueous dispersion comprising silanized colloidal silica particles having an average particle diameter ranging from about 3 to about 50 nm, wherein the silanized colloidal silica particles comprise silane groups originating from a) at least one silane compound containing an epoxy-functionality and b) at least one silane compound having no epoxy-functionality and comprising at least one of an amido-functionality or an ureido-functionality, wherein the weight ratio of both a) and b) to silica ranges from about 0.01 to about 0.5 and the silica content on the dispersion is from about 20 to about 80 wt %.

10. The aqueous dispersion according to claim 9 , wherein the silanized colloidal silica particles are capable of imparting improved hardness and/or water resistance to a lacquer.

11. The aqueous dispersion according to claim 9 , wherein the weight ratio of b) to a) ranges from about 2 to about 0.1.

12. The aqueous dispersion according to claim 9 , further comprising a lacquer.

13. The aqueous dispersion according to claim 10 , wherein the weight ratio of b) to a) ranges from about 2 to about 0.1.

14. The aqueous dispersion according to claim 11 , further comprising a lacquer.

Assignees

• Greenwood Peter Harry Johan
• Lagnemo Hans
• Lagnemo Martin
• Akzo Nobel Chemicals Int Bv

Inventors

• Greenwood Peter Harry Johan
• Lagnemo Hans
• Lagnemo Martin

Classifications

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C09C1/3081 Primary

  Treatment with organo-silicon compounds · CPC title

• C01B33/148

  Concentration; Drying; Dehydration; Stabilisation; Purification {(C01B33/1465 takes precedence)} · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C08K3/36

  Silica · CPC title