Electrically conductive pressure sensitive adhesives, method of manufacture, and use thereof

• US 20050062024A1
• Filed: 07/30/2004
• Published: 03/24/2005
• Est. Priority Date: 08/06/2003
• Status: Abandoned Application

• Current Assignee: World Properties Incorporated
• Original Assignee: World Properties Incorporated
• Inventors: Paul, Sankar K., Bessette, Michael D.
• Application Number:
  US10/903,462
• Publication Number:
  US 20050062024A1
• Time in Patent Office: Days
• US Class Current: 252/500
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C09J 11/04 inorganic
• CPC Class Codes: C09J 2301/314 the adhesive layer and/or the carrier being conductive
• CPC Class Codes: C09J 2483/006 in the substrate
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 9/02 Electrically-conducting adhesives
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

An adhesive, comprising a pressure-sensitive adhesive composition; and carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive. Such adhesives are of particular use with gasketing materials.

Claims

1. An adhesive, comprising

a pressure-sensitive adhesive composition;

and

carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive.

2. The adhesive of claim 1, having a volume resistivity of about 10⁻

3 ohm-cm to about 10⁸ ohm-cm.

3. The adhesive of claim 1, having a volume resistivity of less than about 10 ohm-cm.

4. The adhesive of claim 1, having a volume resistivity of less than about 1 ohm-cm.

5. An article comprising the adhesive composition of claim 1 disposed on a substrate.

6. The article of claim 5, wherein the substrate is electrically conductive.

7. The article of claim 6, wherein the substrate has a volume resistivity of about 10⁻

3 ohm-cm to about 10⁸ ohm-cm.

8. The article of claim 7, wherein the substrate has a volume resistivity of less than about 10 ohm-cm.

9. The article of claim 7, wherein the substrate has a volume resistivity of less than about 1 ohm-cm.

10. A pressure-sensitive adhesive tape, comprising

a backing layer having a first side and a second side opposite said first side;

and

a pressures-sensitive adhesive layer having a first side and a second side opposite the first side, wherein

the first side of the pressure-sensitive adhesive layer is in contact with at least a portion of the first side of the backing layer,

the second side is bondable under pressure to a substrate, and

the pressure-sensitive adhesive layer comprises

a pressure-sensitive adhesive composition; and

carbon nanotubes in an amount effective to render the pressure-sensitive adhesive composition electrically conductive.

11. The tape of claim 10, wherein the backing layer is an electrically conductive polymer.

12. The tape of claim 10, wherein the backing layer is an electrically conductive silicone.

13. The tape of claim 10, wherein the backing layer has a volume resistivity of about 10⁻

3 ohm-cm to about 10⁸ ohm-cm.

14. The tape of claim 12, wherein the backing layer has a volume resistivity of less than about 10 ohm-cm.

15. The tape of claim 12, wherein the backing layer has a volume resistivity of less than about 1 ohm-cm.

16. An article, comprising

a substrate having a surface;

and

the tape of claim 10, wherein the second side of the pressure-sensitive adhesive layer is bonded to at least a portion of the surface of the substrate.

17. The article of claim 16, wherein the tape provides an EMI shielding effectiveness of at least about 60 dB over a frequency range of about 10 to about 10 GRz.

18. The article of claim 16, wherein the initial peel strength between the backing and the surface of the substrate is about 1.5 to about 5.0 lb/in (0.26-0.87 N/m).

19. The article of claim 16, wherein the volume resistivity between the backing and the surface of the substrate is about 10⁻

3 ohm-cm to about 10⁸ ohm-cm.

20. A method of manufacture of an adhesive, comprising

mixing a pressure-sensitive adhesive formulation in a solvent or diluent with carbon nanotubes;

applying the mixture to a substrate or backing layer;

removing the solvent or diluent; and

optionally curing the adhesive.