Use of quantum dots in pigment dispersion liquid, pigment dispersion liquid and process for producing the same

Patent metadata

Field	Value
Publication number	US-9540516-B2
Application number	US-201314095609-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Dec 12, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

The invention relates to use of quantum dots in a pigment dispersion liquid. The invention also relates to a pigment dispersion liquid, which comprises a pigment, quantum dots, a dispersion agent, a dispersing resin and a solvent. The invention also relates to the process for producing the pigment dispersion liquid. The use of quantum dots provided by the invention broadens the application field of the quantum dots and develops the use thereof in the field of liquid crystal display. The pigment dispersion liquid having quantum dots added therein provided by the invention has a significantly improved stability of dispersion. Furthermore, the quantum dots and the organic pigment can interact with each other by adjusting the composition, the size or the like of the quantum dots, so that the properties of the pigment are improved and the contrast thereof is increased.

First claim

What is claimed is:

1. A pigment dispersion liquid, comprising the following components in terms of part by weight:
a pigment: 5 to 30 parts;
quantum dots: 1 to 10 parts;
a dispersion agent: 1 to 20 parts;
a dispersing resin: 1 to 15 parts; and
a solvent: 50 to 100 parts.

2. The pigment dispersion liquid according to claim 1 , comprising the following components in terms of part by weight:
the pigment: 5 to 20 parts;
the quantum dots: 1 to 5 parts;
the dispersion agent: 5 to 15 parts;
the dispersing resin: 1 to 10 parts; and
the solvent: 60 to 90 parts.

3. The pigment dispersion liquid according to claim 1 , wherein the quantum dots are spherical quantum dots.

4. The pigment dispersion liquid according to claim 1 , wherein the quantum dots are oil soluble quantum dots.

5. The pigment dispersion liquid according to claim 1 , wherein the quantum dots are selected from one or more of doped or undoped quantum dots of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride.

6. The pigment dispersion liquid according to claim 1 , wherein the pigment is selected from one or more of red pigment, yellow pigment, blue pigment, green pigment, and violet pigment.

7. The pigment dispersion liquid according to claim 1 , wherein the dispersion agent is selected from one or more of an amide based polymer, a modified polyurethane polymer, a high molecular block copolymer containing a pigment-philic group, a modified polyurethane, a modified polyacrylate, and a silicone surfactant.

8. The pigment dispersion liquid according to claim 1 , wherein the dispersing resin is selected from one or more of an epoxy acrylate, a phenolic resin, a modified styrene-acrylate copolymer, and a styrene-maleic anhydride copolymer.

9. The pigment dispersion liquid according to claim 1 , wherein the solvent is selected from one or more of ethylene glycol ether, ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, monomethyl ether ethylene glycol ester, propylene glycol monomethyl ether, propylene glycol methyl ether acetate, propylene glycol monomethyl ether acetate, isopropanol, and n-butanol.

10. A process for producing the pigment dispersion liquid according to claim 1 , comprising:
(1) a pre-dispersing stage of adding the dispersion agent, the dispersing resin, the pigment, the quantum dots, and 20 to 80 wt % of the solvent, and stirring them until being uniform to obtain a pigment mixture;
(2) a grinding stage of grinding the pigment mixture prepared in the pre-dispersing stage; and
(3) a diluting stage of adding the rest of the solvent into the grinded pigment mixture and stirring them for dilution to obtain the pigment dispersion liquid.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Lun Jianchao
• Xin Yangyang
• Lu Jinbo

Classifications

• C09B67/009

  polymeric dispersing agent · CPC title

• C09B67/0002 Primary

  Grinding; Milling with solid grinding or milling assistants · CPC title

• C09B67/006 Primary

  Preparation of organic pigments · CPC title