Metal oxide particles with uniform multilayer polymer coatings

Patent metadata

Field	Value
Publication number	US-9796793-B2
Application number	US-201414479113-A
Country	US
Kind code	B2
Filing date	Sep 5, 2014
Priority date	Sep 6, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

The present invention is a multilayered composite comprising porous metal oxide particles that are covalently bonded by way of inorganic ether groups to one or more sites of a first polyhydroxyl-functionalized polymer. This first polymer is in turn covalently bonded by way of inorganic ether groups to one or more sites of a second polyhydroxyl-functionalized polymer. The multilayered composites can be prepared by contacting porous inorganic-oxide particles with a sufficient amount of OH-reactive crosslinking agent to form metal oxide particles imbibed with the crosslinking agent, and then contacting the inorganic-oxide particles with a solution of polyhydroxyl-functionalized polymer under reactive conditions.

First claim

What is claimed is:

1. A multilayered composite comprising porous metal oxide particles that are covalently bonded, by way of inorganic ether groups to one or more sites of a first polyhydroxyl-functionalized polymer, which is covalently bonded by way of inorganic ether groups to one or more sites of a second polyhydroxyl-functionalized polymer.

2. The composite of claim 1 , which comprises additional layers of polyhydroxyl-functionalized polymers bonded to each other at one or more sites bonded through the inorganic ether groups, wherein the inorganic ether groups are O—Si—O, O—Ti—O, O—Al—O, or O—B—O groups.

3. The composite of claim 2 , wherein the inorganic ether groups are O—Si—O groups.

4. The composite of claim 2 , wherein the thickness of the polymeric portion of the multilayer composite in the dry state is from 10-30 nm.

5. The composite of claim 1 , wherein the porous metal oxide particles comprise oxide particles of Ti, Al, Si, Zn, Fe, B, Ce, or Zr or a combination thereof.

6. The composite of claim 1 , wherein the porous metal oxide particles comprise titanium dioxide pigment the surface of which comprises alumina, silica, zirconia or combinations thereof.

7. The composite of claim 1 , wherein the first and/or second polyhydroxyl-functionalized polymer comprises an oligosaccharide.

8. The composite of claim 7 , wherein the oligosaccharide is functionalized with carboxylic acid groups, amine, groups, quaternary ammonium salt groups, alkylene oxide groups, C 10 -C 20 alkyl groups or combinations thereof.

9. The composite of claim 1 , wherein the first and/or second polyhydroxyl-functionalized polymer comprises a cellulose-derived poly(1→4)-β-glucan.

10. The composite of claim 1 , wherein the polyhydroxyl-functionalized polymers are further functionalized with carboxylic acid groups, amine groups, quaternary ammonium salt groups, alkylene oxide groups, C 10 -C 20 alkyl groups or combinations thereof.

Assignees

• Univ California
• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Jankolovits Joseph
• Katz Alexander S
• Gazit Oz M
• Bohling James C
• Roper Iii John A

Classifications

• C09C1/3676

  Treatment with macro-molecular organic compounds · CPC title

• C09C3/10

  Treatment with macromolecular organic compounds {(C09C3/006 takes precedence)} · CPC title

• C09C1/3072

  Treatment with macro-molecular organic compounds · CPC title

• C08B37/0024 Primary

  beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof · CPC title

• C09D105/00 Primary

  Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00 · CPC title