Electrically conductive adhesive tapes and articles therefrom

Patent metadata

Field	Value
Publication number	US-2016333232-A1
Application number	US-201515112595-A
Country	US
Kind code	A1
Filing date	Jan 21, 2015
Priority date	Jan 24, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

An electrically conductive, single-sided tape includes a conductive adhesive layer, which includes a first conductive porous substrate having a plurality of passageways and an adhesive material positioned within at least a portion of the passageways; and a second conductive porous substrate positioned adjacent the conductive adhesive layer. Optionally, the electrically conductive, single-sided tape may include an opaque coating adjacent to a major surface of the second conductive porous substrate. Optionally, the adhesive material may include a plurality of conductive particles dispersed within the adhesive material.

First claim

1 . An electrically conductive, single-sided tape comprising:
a conductive adhesive layer comprising:
a first conductive porous substrate having a plurality of passageways; and
an adhesive material positioned within at least a portion of the passageways; and
a second conductive porous substrate having first and second major surfaces and a plurality of passageways, wherein the second major surface of the second conductive porous substrate is positioned adjacent the conductive adhesive layer.

2 . The electrically conductive, single-sided tape of claim 1 , wherein the second conductive porous substrate comprises a conductive woven or nonwoven fabric having conductive fibers, wherein the conductive fibers comprise electrical contact regions and interstitial regions between the fibers.

3 . The electrically conductive, single-sided tape of claim 2 , further comprising an opaque coating disposed in at least a portion of the interstitial regions between the fibers.

4 . The electrically conductive, single-sided tape of claim 1 , wherein the electrical resistance, as measured by Test Method 3, is less than about 8 ohms.

5 . The electrically conductive, single-sided tape of claim 3 , wherein the opaque coating is non-electrically conductive.

6 . The electrically conductive, single-sided tape of claim 3 , wherein greater than 50% of the opaque coating is in the interstitial regions adjacent the first major surface of the second conductive porous substrate.

7 . The electrically conductive, single-sided tape of claim 3 , wherein a portion of the electrical contact regions is substantially free of the opaque coating.

8 . The electrically conductive, single-sided tape of claim 3 , wherein greater than 30% of the electrical contact regions coincident with the first major surface, based on the total area of the electrical contact regions coincident the first major surface, are substantially free of the opaque coating.

9 . The electrically conductive, single-sided tape of claim 2 , wherein the conductive fibers are conductive composite fibers.

10 . The electrically conductive, single-sided tape of claim 1 , further comprising an opaque coating disposed on at least a portion of the first major surface of the second conductive porous substrate.

11 . The electrically conductive, single-sided tape of claim 10 , wherein the opaque coating is an opaque polymeric film.

12 . The electrically conductive, single-sided tape of claim 1 , wherein the adhesive material is a conductive adhesive material.

13 . The electrically conductive, single-sided tape of claim 1 , wherein the first conductive porous substrate is a conductive nonwoven substrate and the second conductive porous substrate is a conductive woven or conductive nonwoven substrate.

14 . The electrically conductive, single-sided tape of claim 1 wherein the first conductive porous substrate comprises conductive fibers.

15 . The electrically conductive, single-sided tape of claim 14 , wherein a portion of the conductive fibers of the first conductive porous substrate protrude from at least one major surface of the conductive adhesive layer.

16 . The electrically conductive single-sided tape of claim 3 , wherein a portion of the conductive fibers of the second porous substrate protrude through the opaque coating.

17 . The electrically conductive single-sided tape of claim 1 , wherein the conductive single-sided tape is between about 15 um and about 150 μm thick.

18 . The electrically conductive single-sided tape of claim 1 , wherein the adhesive material is a pressure sensitive adhesive material.

19 . The electrically conductive, single-sided tape of claim 1 , wherein the conductive adhesive layer comprises a first adhesive layer and a second adhesive layer.

20 . The electrically conductive, single-sided tape of claim 1 , wherein the passageways of the first conductive porous substrate are filled with adhesive material such that the conductive porous substrate includes less than about 10% voids by volume.

21 . An assembly comprising:
a first substrate having a first surface; and an electrically conductive single-sided tape according to claim 1 , wherein the first surface of the first substrate is bonded to the conductive adhesive layer of the electrically conductive single-sided tape.

22 . The assembly of claim 21 , further comprising a second substrate, wherein the second substrate is positioned adjacent to and in electrical communication with the second conductive porous substrate of the electrically conductive single-sided tape.

23 . The assembly of claim 22 , wherein at least one of the first and second substrates of the assembly are electrically conductive.

24 . An assembly comprising:
a first substrate having a first surface; a first layer of an electrically conductive single-sided tape according to claim 1 , wherein the first surface of the first substrate is bonded to the conductive adhesive layer of the first layer of electrically conductive single-sided; and a second layer of electrically conductive single-sided tape according to claim 1 , wherein the second conductive porous substrate of the first layer of electrically conductive single-sided tape is bonded to the conductive adhesive layer of the second layer of electrically conductive single-sided tape.

Assignees

• 3M Innovative Properties Co

Inventors

• Choi Jeongwan
• Mccutcheon Jeffrey W

Classifications

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J2467/006

  in the substrate · CPC title

• C09J9/02 Primary

  Electrically-conducting adhesives · CPC title

• C09J7/0289

  Chemistry & Metallurgy · mapped topic

• C09J2301/314

  the adhesive layer and/or the carrier being conductive · CPC title