Titanium oxide spacing by SIP

Patent metadata

Field	Value
Publication number	US-9340433-B2
Application number	US-201113095300-A
Country	US
Kind code	B2
Filing date	Apr 27, 2011
Priority date	Apr 27, 2011
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A method of making a titanium oxide-containing coating composition comprises attaching an initiator to a pretreated titanium oxide to form an initiator/pretreated titanium oxide complex. The pretreated titanium oxide includes a plurality of pretreated titanium oxide particles which are titanium oxide particles that are pretreated with at least one metal oxide. The initiator/pretreated titanium oxide complex is contacted with a polymerizable unsaturated monomer such that a polymeric encapsulate forms on the initiator/pretreated titanium oxide particles to form polymeric encapsulated titanium oxide particles.

First claim

What is claimed is:

1. An encapsulated titanium oxide for coating compositions, the encapsulated titanium oxide consisting of a plurality of pretreated titanium oxide particles, residues of an initiator attached to surfaces of the pretreated titanium oxide particles, and a polymeric layer disposed over the pretreated titanium oxide particles and the residues of the initiator, the polymeric layer consisting of polymer chains that extend from surfaces of the pretreated titanium oxide particles, the polymer chains consisting of residues of a hydrophilic monomer and optionally residues of a hydrophobic monomer, wherein:
the pretreated titanium oxide particles are titanium oxide particles pretreated with at least one metal oxide;
the initiator has the following formula
X 1 —R 1 —X 2

wherein:
X 1 is a leaving group that is replaced by chemically active functional groups on the surfaces of the pretreated titanium oxide particles;
R 1 is a C 6 -C 20 hydrocarbon-containing group consisting of components selected from the group consisting of phenyl groups, C 1 -C 10 alkyl groups, C 1 -C 10 allyl, ester, nitrile, benzyl, ether, C 1 -C 4 epoxy, hydroxyl, vinyl, and combinations thereof; and
X 2 is a halogen.

2. The encapsulated titanium oxide of claim 1 wherein the metal oxide comprises a component selected from the group consisting of silicon oxides, aluminum oxides, zirconium oxides, and combinations thereof.

3. The encapsulated titanium oxide of claim 1 wherein the polymeric layer has an average thickness from about 10 nanometers to about 500 nanometers and the pretreated titanium oxide particles have an average spatial dimension from about 0.05 to about 1 microns.

4. The encapsulated titanium oxide of claim 1 wherein the polymeric layer includes residues of a component selected from the group consisting of styrenes, acrylates, methacrylates, acrylonitriles, (meth)acrylamides, vinyl pyridines, vinyl phosphates, methyl-N-propanesulfonic acids, methacrylic acids, and combinations thereof.

5. The encapsulated titanium oxide of claim wherein X 1 is a C 1 -C 10 alkoxysilane.

6. The encapsulated titanium oxide of claim 1 wherein R 1 includes one or more phenyl groups.

7. The encapsulated titanium oxide of claim 1 wherein the initiator has the following formula:

8. The encapsulated titanium oxide of claim 1 wherein the polymer chains consist of residues of a hydrophilic monomer and residues of a hydrophobic monomer.

9. The encapsulated titanium oxide of claim 1 wherein the hydrophilic monomer is H 2 C═C(CH 3 )COO(CH 2 CH 2 O) 6 H.

10. A coating composition comprising:
a liquid-containing composition;
an encapsulated titanium oxide dispersed in the liquid-containing composition, the encapsulated titanium oxide consisting of a plurality of pretreated titanium oxide particles, residues of an initiator attached to surfaces of the pretreated titanium oxide particles, and a polymeric layer disposed over the pretreated titanium oxide particles and the residues of the initiator, the polymeric layer consisting of polymer chains that extend from surfaces of the pretreated titanium oxide particles, the polymer chains consisting of residues of a hydrophilic monomer and optionally residues of a hydrophobic monomer, wherein:
the pretreated titanium oxide particles are titanium oxide particles pretreated with at least one metal oxide;
the initiator has the following formula
X 1 —R 1 —X 2

where:
X 1 is a leaving group that is replaced by chemically active functional groups on the surfaces of the pretreated titanium oxide particles;
R 1 is a C 6 -C 20 hydrocarbon-containing group consisting of components selected from the group consisting of phenyl groups, C 1 -C 10 alkyl groups, C 1 -C 10 allyl, ester, nitrile, benzyl, ether, C 1 -C 4 epoxy, hydroxyl, vinyl, and combinations thereof; and
X 2 is a halogen.

11. The coating composition of claim 10 wherein the metal oxide comprises a component selected from the group consisting of silicon oxides, aluminum oxides, and combinations thereof.

12. The coating composition of claim 10 wherein the polymeric layer has an average thickness from about 10 nanometers to about 500 nanometers and the pretreated titanium oxide particles have an average spatial dimension from about 0.05 to about 1 microns.

13. The coating composition of claim 10 wherein the polymeric layer includes residues of a component selected from the group consisting of styrenes, acrylates, methacrylates, acrylonitriles, (meth)acrylamides, vinyl pyridines, vinyl phosphates, methyl-N-propanesulfonic acids, methacrylic acids, and combinations thereof.

14. The coating composition of claim 10 wherein the liquid-containing composition includes a binder.

15. The coating composition of claim 14 wherein the liquid-containing composition further comprises a component selected from the group consisting of water, solvent, thickeners, dispersants, surfactants, defoamers, additives, and combinations thereof.

16. The coating composition of claim 10 wherein X 1 is a C 1 -C 10 alkoxysilane.

17. The coating composition of claim 10 wherein R 1 includes one or more phenyl groups.

18. The coating composition of claim 10 wherein the initiator has the following formula:

19. The coating composition of claim 10 wherein the polymer chains consist of residues of a hydrophilic monomer and residues of a hydrophobic monomer.

20. The coating composition of claim 10 wherein the hydrophilic monomer is H 2 C═C(CH 3 )COO(CH 2 CH 2 O) 6 H.

Assignees

• Fan Xiaowu
• Shi Jinzhen
• Tarng Ming-Ren
• Lee Dong-Keun
• Messersmith Phillip B
• Behr Process Corp
• Univ Northwestern

Inventors

• Fan Xiaowu
• Shi Jinzhen
• Tarng Ming-Ren
• Lee Dong-Keun
• Messersmith Phillip B

Classifications

• C01P2002/88

  by thermal analysis data, e.g. TGA, DTA, DSC · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C09C1/3676

  Treatment with macro-molecular organic compounds · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C01G23/047 Primary

  Titanium dioxide · CPC title