Conductive material and connected structure

Patent metadata

Field	Value
Publication number	US-9490046-B2
Application number	US-201414891615-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	May 23, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

There is provided a conductive material which has a rapid reaction rate and is high in fluxing effect. The conductive material according to the present invention includes a conductive particle having solder at at least an external surface, an anionically hardenable compound, an anionic hardener, and an organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group.

First claim

The invention claimed is:

1. A conductive material, comprising conductive particles having solder at at least an external surface, an anionically hardenable compound, an anionic hardener, and an organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group.

2. The conductive material according to claim 1 , wherein the organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group is obtained by esterifying a part of carboxyl groups in an organic acid having a plurality of carboxyl groups.

3. The conductive material according to claim 1 , wherein the organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group is obtained by allowing an organic acid having a plurality of carboxyl groups and an alcohol to react with each other so that a part of carboxyl groups is esterified.

4. The conductive material according to claim 1 , further comprising an esterified substance obtained by esterifying all of carboxyl groups in an organic acid having a plurality of carboxyl groups.

5. The conductive material according to claim 1 , further comprising an organic acid having a plurality of carboxyl groups but having no functional group that is an esterified carboxyl group.

6. The conductive material according to claim 1 , further comprising an esterified substance obtained by esterifying all of carboxyl groups in an organic acid having a plurality of carboxyl groups, and an organic acid having a plurality of carboxyl groups but having no functional group that is an esterified carboxyl group.

7. The conductive material according to claim 6 , wherein the proportion of the functional group that is an esterified carboxyl group is greater than or equal to 10% and less than or equal to 80%, relative to 100% of the whole number of carboxyl groups and functional groups that are esterified carboxyl groups, in the total of the organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group, the esterified substance obtained by esterifying all of carboxyl groups in an organic acid having a plurality of carboxyl groups, and the organic acid having a plurality of carboxyl groups but having no functional group that is an esterified carboxyl group.

8. The conductive material according to claim 1 , wherein an acid value is greater than or equal to 50 mgKOH/g and less than or equal to 370 mgKOH/g.

9. The conductive material according to claim 1 , wherein the organic acid having a carboxyl group and having a functional group that is an esterified carboxyl group has one carboxyl group.

10. The conductive material according to claim 1 , being a circuit connecting, material used for the electrical connection between electrodes.

11. A connected structure, comprising a first connection object member having a first electrode on its surface, a second connection object member having a second electrode on its surface, and a connection part connecting the first connection object member and the second connection object member, wherein the connection part is formed of the conductive material according to claim 1 , and the first electrode and the second electrode are electrically connected by the conductive particle.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Ishizawa Hideaki
• Kubota Takashi

Classifications

• H10W99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• H10W72/30

  Die-attach connectors · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/18

  Non-metallic particles coated with metal · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title