# US 10,479,914 B2 · Conductive particle and preparation method thereof, conductive adhesive and display device

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- Number: US 10,479,914 B2
- Document ID: US10479914B2
- Status: Granted
- Kind: B2
- Application number: 15/141,451
- Filed: 2016-04-28
- Published: 2017-03-30
- Granted: 2019-11-19
- Earliest claimed: 2015-09-25
- Assignees: Boe Technology Group Co., Ltd.; Hefei Boe Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Hefei Boe Optoelectronics Technology Co., Ltd.
- Inventors: Dezhi Xu
- Web page: https://patentgrep.com/patent/US10479914B2

## CPC

- C09J 9/02: Electrically-conducting adhesives
- C09J 1/00: Adhesives based on inorganic constituents
- C09J 11/08: Macromolecular additives
- C08K 9/00: Use of pretreated ingredients
- C08K 2201/001: Conductive additives
- H10W 72/321: {Structures or relative sizes of die-attach connectors}
- H10W 72/351: {Materials of die-attach connectors}
- H10W 72/353: {not comprising solid metals or solid metalloids, e.g. ceramics}
- H10W 72/355: {of outermost layers of multilayered die-attach connectors, e.g. material of a coating}
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

The present disclosure provides a conductive particle and a preparation method thereof, a conductive adhesive and a display device. The preparation method comprises steps of: forming cores; dispersing the spherical cores in deionized water and adding organic polymeric monomers so as to form a reaction solution; radiating the reaction solution with γ rays so that the organic polymeric monomers are polymerized on surfaces of the cores so as to form organic polymers; separating the spherical cores formed with the organic polymers on their surfaces from the reaction solution so as to obtain them; successively carrying out preoxidation and carbonization treatment on the cores formed with the organic polymers on their surfaces so that the organic polymers form a conductive layer consisting of carbon particles so as to obtain conductive particles each consisting of the conductive layer and the core.

## Claims

### Claim 1

A method of preparing conductive particles, comprising the steps of:
forming spherical cores comprising silica;
dispersing the spherical cores in deionized water and adding organic polymeric monomers so as to form a reaction solution, wherein the organic polymeric monomer is one or more selected from the group consisting of acrylonitrile, 2,3-dimethyl acrylonitrile, 3-phenyl-2-acrylonitrile, and 2-methoxymethyl-3-methoxy acrylonitrile, and a mass ratio of the organic polymeric monomers to the spherical cores ranges from 0.5:1 to 2:1;
radiating the reaction solution with γ rays so that the organic polymeric monomers are polymerized on surfaces of the spherical cores so as to form organic polymers;
separating the spherical cores from the reaction solution so as to obtain the spherical cores formed with the organic polymers on their surface; and
carrying out preoxidation and carbonization treatment successively on the spherical cores formed with the organic polymers on their surfaces so that the organic polymers form a conductive layer consisting of carbon particles, thereby obtaining the conductive particles each consisting of the conductive layer and the spherical core.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the step of forming spherical cores comprises forming the spherical cores using one or more selected from the group consisting of a sol-gel process, a process of emulsion polymerization, a microemulsion process, a hydrothermal process, and a microwave hydrothermal process.

### Claim 3 (depends on 2)

The method according to claim 2, wherein silica spherical cores are formed through the sol-gel process, and the step of forming silica spherical cores through the sol-gel process comprises:
adding aqueous ammonia to a mixed solution of ethanol and water so as to form an original reaction solution;
adding tetraethylorthosilicate to the original reaction solution to carry out a reaction so as to form silica spherical cores; and
subjecting the formed silica spherical cores to separating, washing and drying treatments successively.

### Claim 4 (depends on 1)

The method according to claim 1, wherein, prior to the step of radiating the reaction solution with γ rays, the method further comprises:
introducing a nitrogen gas into the reaction solution so as to remove dissolved oxygen from the reaction solution.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the step of carrying out preoxidation and carbonization treatment successively on the spherical cores formed with the organic polymers on their surfaces comprises:
placing the spherical cores formed with the organic polymers on their surfaces in a heating vessel, and heating the spherical cores formed with the organic polymers on their surfaces in the presence of air so as to preoxidize the organic polymers;
introducing an inert gas into the heating vessel and heating the spherical cores formed with the organic polymers on their surfaces so as to carbonize the organic polymers; and
after the heating vessel has been cooled down, obtaining the conductive particles each consisting of the conductive layer and the spherical core.