Core-shell metal nanoparticle composite

Patent metadata

Field	Value
Publication number	US-9718970-B2
Application number	US-201514604598-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jan 23, 2015
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A nanocomposite includes a core comprising a first polymer, a shell disposed about the core, the shell comprising a sulfonated polyester, the first polymer and sulfonated polyester are different, and a plurality of silver nanoparticles disposed throughout the shell layer.

First claim

What is claimed is:

1. A nanocomposite comprising:
a core comprising a first polymer;
a shell disposed about the core, the shell comprising a sulfonated polyester; wherein the first polymer and sulfonated polyester are different; and
a plurality of silver nanoparticles disposed throughout the shell layer, wherein the plurality of silver nanoparticles are present in an amount from about 0.005 weight percent to about 10 weight percent of the total shell weight;
wherein the nanocomposite is prepared according to the method comprising:
heating a sulfonated polyester resin in water at a temperature from about 65° C. to 90° C.;
adding aqueous solution of silver (I) ion source dropwise to the heated sulfonated polyester to form an emulsion;
optionally adding an aqueous solution of a reducing agent dropwise to the emulsion;
adding the emulsion dropwise to polystyrene-co-n-butyl acrylate latex nanoparticles in water, continuing heating to form the nanocomposite;

wherein the nanocomposite has an effective diameter in a range from about 25 nm to about 500 nm.

2. The nanocomposite of claim 1 , wherein the core is an emulsion comprising the first polymer comprising one or more monomer units selected from the group consisting of styrene, n-butyl acrylate, methacrylic acid, and beta-carboxyethyl acrylate.

3. The nanocomposite of claim 1 , wherein the first polymer is polystyrene-co-n-butyl acrylate.

4. The nanocomposite of claim 1 , wherein the sulfonated polyester is branched.

5. The nanocomposite of claim 1 , wherein the sulfonated polyester is linear.

6. The nanocomposite of claim 1 , wherein the sulfonated polyester is a sodium, potassium or lithium salt of a polymer selected from the group consisting of poly(1,2-propylene-5-sulfoisophthalate), poly(neopentylene-5-sulfoisophthalate), poly(diethylene-5-sulfoisophthalate), copoly-(1,2-propylene-5-sulfoisophthalate)-copoly-(1,2-propylene-terephthalate phthalate), copoly-(1,2 propylenediethylene-5-sulfoisophthalate)-copoly-(1,2-propylene-diethylene-terephthalate phthalate), copoly(ethylene neopentylene-5-sulfoisophthalate)-copoly(ethylene-neopentylene-terephthalate phthalate), and copoly(propoxylated bisphenol A)-copoly-(propoxylated bisphenol A-5-sulfoisophthalate).

7. The nanocomposite of claim 1 , wherein the plurality of silver nanoparticles are present in an amount from about 0.005 weight percent to 1 weight percent of the total shell weight.

8. An ink comprising the nanocomposite of claim 1 , wherein the ink is selected from the group consisting of an aqueous ink, a dry ink, a 3-dimensional or additive composite ink, a gravure ink, a flexographic ink, an offset printing ink and an offset lithography ink.

9. An article comprising a nanocomposite according to claim 1 .

10. The article of claim 9 , wherein the article is a coating, a sensor, or an ink.

Assignees

• Xerox Corp

Inventors

• Farrugia Valerie M
• Desouza Alana
• Gardner Sandra J

Classifications

• C09D5/14

  Paints containing biocides, e.g. fungicides, insecticides or pesticides (C09D5/16 takes precedence) · CPC title

• A01N25/28

  Microcapsules {or nanocapsules} · CPC title

• C08K13/02

  Organic and inorganic ingredients · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• A01N59/16

  Heavy metals; Compounds thereof · CPC title