Aqueous composition containing suspended ZnO particles

Patent metadata

Field	Value
Publication number	US-11136499-B2
Application number	US-201515504371-A
Country	US
Kind code	B2
Filing date	Sep 11, 2015
Priority date	Sep 12, 2014
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

The invention relates to an aqueous composition comprising a suspension of ZnO particles and a polymer stabiliser containing carboxylic acid functions and carboxylic acid salt functions.

First claim

The invention claimed is:

1. A method for preparing an electrostatically stable aqueous suspension of ZnO particles and a polymer stabilizer said method consisting of the following steps:
a) preparing an aqueous solution of a polymer stabilizer in water, wherein the polymer stabilizer is a copolymer of (meth)acrylic acid and a (meth)acrylic acid salt or the polymer stabilizer is a mixture a (meth)acrylic acid polymer and a (meth)acrylic acid salt polymer; and wherein a molar ratio of carboxylic acid group to carboxylic acid salt group in the polymer stabilizer is in the range from 25/75 to 75/25;
b) adding a zinc precursor to the aqueous solution of step a), wherein the zinc precursor is ZnR 2 ; Zn(OR) 2 ; Zn(NR 2 ) 2 or Zn(O—C(═O)R) 2 ; R being a hydrocarbon group comprising 1 to 18 carbon atoms; and forming at ambient temperature ZnO particles by hydrolysis of the zinc precursor in the aqueous solution; and
thereby producing the electrostatically stable aqueous suspension of ZnO particles and the polymer stabilizer.

2. A method for manufacturing an article selected from the group consisting of photovoltaic cells, paint, textiles, electronics, biosensors, and anti-microbial and anti-fouling coatings, wherein the method comprises: depositing the electrostatically stable aqueous suspension of claim 1 on the article.

3. The method according to claim 1 , wherein the stabilizer represents 0.01 to 10% by weight relative to the weight of the aqueous composition.

4. The method according to claim 1 , wherein the ZnO particles represent 0.1 to 20% by weight relative to the weight of the aqueous composition.

5. The method according to claim 1 , wherein: the molar ratio of carboxylic acid groups to carboxylic acid salt groups is included between 25/75 and 75/25; the ZnO particles represent 0.1 to 20% by weight relative to the weight of the aqueous composition; and the polymer stabilizer represents 0.5 to 0.7% by weight relative to the aqueous composition, and said polymer stabilizer is constituted of a mixture of: poly((meth)acrylic acid) having a molecular weight less than or equal to 240,000 g/mol; and of poly(methacrylic acid sodium salt) having a molecular weight less than or equal to 240,000 g/mol.

Assignees

• Univ Claude Bernard Lyon
• Centre Nat Rech Scient

Inventors

• Daniele Stéphane
• Valette Audrey
• Cornier Thibaut

Classifications

• H10F77/45

  Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements · CPC title

• C09C1/043 Primary

  Zinc oxide · CPC title

• C09C3/10 Primary

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

• C08L2201/54

  Aqueous solutions or dispersions · CPC title

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title