Anisotropic conductive sheet

• US 20040009343A1
• Filed: 01/16/2003
• Published: 01/15/2004
• Est. Priority Date: 08/09/2000
• Status: Active Grant

• Current Assignee: ISC Incorporated (Svenska Cellulosa AB SCA)
• Original Assignee: JSR Corporation
• Inventors: Inoue, Kazuo, Igarashi, Hisao, Setaka, Ryoji
• Granted Patent: US 6,849,335 B2
• Time in Patent Office: Days
• US Class Current: 428/327
• CPC Class Codes: H01B 1/20 Conductive material dispersed in non-conductive organic material organic macromolecular compounds or compositions C08
• CPC Class Codes: H01R 13/2414 conductive elastomers
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer
• CPC Class Codes: Y10T 428/32 Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer

Abstract

Disclosed herein is an anisotropically conductive sheet capable of holding charge in its surfaces under an unpressurised state, and moving the charge held in the surface in a thickness-wise direction thereof in a state pressurised in the thickness-wise direction, thereby controlling the quantity of the charge at the surface.

This anisotropically conductive sheet comprises a sheet base composed of an elastomer and conductive particles exhibiting magnetism contained in the sheet base in a state oriented so as to arrange in rows in a thickness-wise direction of the sheet base, and dispersed in a plane direction thereof. Supposing that a volume resistivity in the thickness-wise direction under an unpressurised state is R₀, and a volume resistivity in the thickness-wise direction in a state pressurised under a pressure of 1 g/mm² in the thickness-wise direction is R₁, the volume resistivity R₁ is 1×10⁷ to 1×10¹² Ω·m, and a ratio (R₀/R₁) of the volume resistivity R₀ to the volume resistivity R₁ is 1×10¹ to 1×10⁴.

Claims

1. An anisotropically conductive sheet comprising a sheet base composed of an elastomer and conductive particles exhibiting magnetism contained in the sheet base in a state oriented so as to arrange in rows in a thickness-wise direction of the sheet base, and dispersed in a plane direction thereof, wherein

supposing that a volume resistivity in the thickness-wise direction under an unpressurised state is R₀, and a volume resistivity in the thickness-wise direction in a state pressurised under a pressure of 1 g/mm² in the thickness-wise direction is R₁,

the volume resistivity r₁ is 1×

10⁷ to 1×

10¹² Ω

·

m, and

a ratio (R₀/R₁) of the volume resistivity R₀ to the volume resistivity R₁ is 1×

10¹ to 1×

10⁴;

2. The anisotropically conductive sheet according to claim 1, wherein the volume resistivity R₀ is 1×

10⁹ to 1×

10¹⁴ Ω

·

m

3. The anisotropically conductive sheet according to claim 1, wherein a surface resistivity is 1×

10¹³ to 1×

10¹⁶ Ω

/□

.

4. The anisotropically conductive sheet according to claim 1, wherein the total area proportion occupied by a substance forming the conductive particles detected by the electronic probe microanalysis in one surface of the sheet is 15 to 60%.

5. An anisotropically conductive sheet comprising a sheet base composed of an elastomer and conductive particles exhibiting magnetism and a volume-resistivity of 1×

10² to 1×

10⁷ Ω

·

m contained in the sheet base in a state oriented so as to arrange in rows in a thickness-wise direction of the sheet base, and dispersed in a plane direction thereof.

6. The anisotropically conductive sheet according to claim 5, wherein the conductive particles are composed of ferrite.

7. The anisotropically conductive sheet according to claim 5, wherein, a non-magnetic conductivity-imparting substance is contained in the sheet base.