Conductive crosslinked body and production process thereof, and transducer, flexible wiring board and electromagnetic wave shield using the conductive crosslinked body

• US 9,051,446 B2
• Filed: 02/22/2011
• Issued: 06/09/2015
• Est. Priority Date: 03/23/2010
• Status: Active Grant

• Current Assignee: Sumitomo Riko Company Limited.
• Original Assignee: Sumitomo Riko Company Limited.
• Inventors: Kobayashi, Jun, Yoshikawa, Hitoshi, Takahashi, Wataru
• Primary Examiner(s): DOUGHERTY, THOMAS M
• Application Number:
  US13/390,615
• Publication Number:
  US 20120146464A1
• Time in Patent Office: 1,568 Days
• Field of Search: 310/300, 310/800
• US Class Current: 1/1
• CPC Class Codes: C08K 2201/001 Conductive additives
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 5/0091 Complexes with metal-heteroatom-bonds
• CPC Class Codes: C08K 5/057 Metal alcoholates metal enolates C08K5/0091
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: H05K 1/095 for polymer thick films, i.e. having a permanent organic polymeric binder
• CPC Class Codes: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H10N 30/20 with electrical input and mechanical output, e.g. functioning as actuators or vibrators
• CPC Class Codes: H10N 30/206 using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
• CPC Class Codes: H10N 30/857 Macromolecular compositions

Abstract

The present invention provides a flexible conductive crosslinked body excellent in durability having a small influence of a reaction residue after the crosslinking on an object to which the conductive crosslinked body adheres, and a production process of the flexible conductive crosslinked body. The conductive crosslinked body is synthesized from a conductive composition containing a rubber polymer, an organic metal compound, and a conducting agent and has a crosslinked structure. The production process of the conductive crosslinked body includes: a mixed solution preparing step for preparing a mixed solution in which the rubber polymer, the conducting agent, and the organic metal compound are mixed in a solvent capable of dissolving the rubber polymer and capable of chelating the organic metal compound; and a crosslinking step for removing the solvent from the mixed solution to allow a crosslinking reaction to proceed. The conductive crosslinked body is suitable as an electrode or a wire for a transducer, a wire for a flexible wiring board, and an electromagnetic wave shield.

Claims

1. A conductive crosslinked body used for a transducer including an elastomer dielectric film, a plurality of electrodes that are arranged via the dielectric film, and a wire connected with each of the plurality of electrodes, at least one of the electrodes and the wire being formed of the conductive crosslinked body, characterized by being synthesized from a conductive composition containing a rubber polymer having a functional group capable of reacting with active hydrogen or a nucleophilic substituent having active hydrogen, an organic metal compound, and an electrically conducting agent,

wherein a content of the electrically conducting agent is 0.1 vol % or more and 35 vol % or less per 100 vol % of a volume of the conductive crosslinked body, and

the conductive crosslinked body has a crosslinked structure and is expandable/contractible.

2. The conductive crosslinked body according to claim 1, wherein the organic metal compound is one or more type(s) selected from a metal alkoxide compound, a metal acylate compound, and a metal chelate compound.

3. The conductive crosslinked body according to claim 1 or 2, wherein the organic metal compound contains one or more type(s) of elements selected from silicon, titanium, zirconium, hafnium, aluminum, gallium, magnesium, zinc, and boron.

4. The conductive crosslinked body according to claim 1 or 2, wherein the crosslinked structure is formed by a reaction of the functional group of the rubber polymer with the organic metal compound.

5. The conductive crosslinked body according to claim 4, wherein the functional group is one or more type(s) selected from a carboxy group, a hydroxy group, an amino group, and an epoxy group.

6. The conductive crosslinked body according to claim 5, wherein the conducting agent contains carbon black.

7. A production process of the conductive crosslinked body as claimed in claim 1, characterized by comprising:

a mixed solution preparing step for preparing a mixed solution in which the rubber polymer, the conducting agent, and the organic metal compound are mixed in a solvent that is capable of dissolving the rubber polymer and capable of chelating the organic metal compound; and

a crosslinking step for removing the solvent from the mixed solution so as to allow a crosslinking reaction to proceed.

8. A transducer characterized by comprising:

an elastomer dielectric film;

a plurality of electrodes that is arranged via the dielectric film; and

a wire that is connected with each of the plurality of electrodes, wherein

at least one of the electrodes and the wire is formed of the conductive crosslinked body as claimed in claim 1.

9. The transducer according to claim 8, wherein the transducer is an actuator in which the dielectric film expands and contracts in accordance with a voltage applied between the plurality of electrodes.