EP0330452A2
Expired / Lapsed
EP
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Electrically conductive pressure-sensitive adhesive tape
Assignee: 3M Co
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Filing: 1989-02-22
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Granted: —
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Expires: 2009-02-22
Abstract
Abstract Electrically conductive elements on two substrates can be electrically interconnected by an adhesive tape containing electrically conductive equiax particles that are individually positioned in the adhesive layer in a predetermined pattern. Each particle is harder than the elements it is to interconnect, so that hand pressure causes the particles to penetrate into the elements, thus creating a reliable electrical connection. Particularly useful particles are glass beads having a metallic coating that is from 0.1 to 2 mu m thick.
Inventors
- 👤 Clyde D. C/O Minnesota Mining And Calhoun
- 👤 Maurice J. C/O Minnesota Mining And Fleming
- 👤 George D. C/O Minnesota Mining And Foss
- 👤 Richard L. C/O Minnesota Mining And Renstrom
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 09:56
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; C; C09; C09J; C09J7/00; C09J7/20; C09J9/00; C09J9/02; H01R; H01R4/00; H01R4/04; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/321; H05K3/323; H05K3/36; H05K3/368; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0221; H05K2201/023; H05K2201/09; H05K2201/09818; H05K2201/09945; H05K2201/10; H05K2201/10227; H05K2201/10234; H05K2203/00; H05K2203/02; H05K2203/0278; H05K2203/03; H05K2203/0338; H05K3/361; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10T; Y10T428/00; Y10T428/14; Y10T428/1424; Y10T428/1429; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24413; Y10T428/24479; Y10T428/24521; Y10T428/24545; Y10T428/24802; Y10T428/24843; Y10T428/24893; Y10T428/25; Y10T428/256; Y10T428/28; Y10T428/2852; Y10T428/2857
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
Adhesive tape comprising a backing carrying an adhesive layer of substantially uniform thickness in which are individually positioned in a predetermined pattern of laterally spaced, electrically conductive, equiax particles of substantially uniform diameter about equal to or somewhat larger than the adhesive thickness, thus making the adhesive layer electrically conductive through its thickness and electrically insulating laterally, further characterized in that said particles have a Knoop Hardness Value of at least 300, so that when substrates comprising electrically conductive elements are adhered together with a piece of the tape, the particles penetrate those elements upon application of ordinary hand pressure.
Claim 2
Dependent Claim
100 words
Adhesive tape comprising a backing carrying an adhesive layer of substantially uniform thickness in which are individually positioned in a predetermined pattern of laterally spaced, electrically conductive, equiax particles of substantially uniform diameter about equal to or somewhat larger than the adhesive thickness, thus making the adhesive layer electrically conductive through its thickness and electrically insulating laterally, further characterized in that said particles have a Knoop Hardness Value of at least 300, so that when substrates comprising electrically conductive elements are adhered together with a piece of the tape, the particles penetrate those elements upon application of ordinary hand pressure.
Claim 3
Dependent Claim
41 words
Adhesive tape as defined in claim 1 further characterized in that said adhesive is a pressure-sensitive adhesive, and both the diameter of the equiax particles and the thickness of the adhesive layer are within the range of 25 to 150 µm.
Claim 4
Dependent Claim
49 words
Adhesive tape as defined in claim 2 further characterized in that each of said equiax particles has a core with a Knoop Hardness Value of at least 300 and an electrically conductive surface layer, the thickness of which is no more than 10% of the diameter of the core.
Claim 5
Dependent Claim
28 words
Adhesive tape as defined in claim 3 further characterized in that the thickness of the electrically conductive surface layer is within the range of 0.1 to 2 µm.
Claim 6
Dependent Claim
42 words
Adhesive tape as defined in claims 3 or 4 further characterized in that the core of said equiax particles is selected from ceramic, steel, nickel, and work-hardened copper, and the electrically conductive surface layer is selected from gold, silver, tin, and solder.
Claim 7
Dependent Claim
19 words
Adhesive tape as defined in any preceding claim further characterized in that the electrically conductive particles are substantially spherical.
Claim 8
Dependent Claim
46 words
Adhesive tape as defined in claim 1 further characterized in that said adhesive is a pressure-sensitive adhesive, and a great length of the tape is wound upon itself in roll form, said predetermined pattern repeating a large number of times over the length of the tape.
Claim 9
Dependent Claim
35 words
Adhesive tape as defined in claim 1, further characterized in that the adhesive is a pressure-sensitive adhesive and the backing is a disposable carrier web having a low-adhesion backsize coating covering each of its faces.
Claim 10
Dependent Claim
29 words
Adhesive tape as defined in any preceding claim further characterized in that the electrically conductive particles occupy from 0.05 to 5 percent of the area of the adhesive layer.
Claim 11
Dependent Claim
112 words
Method of modifying a conventional adhesive tape having an exposed adhesive layer to make that layer electrically conductive, said method comprising the steps of a) coating one face of a metal foil with rubber and the other face with a photoresist, b) exposing the photoresist to light in a predetermined pattern, c) removing areas of the photoresist corresponding to said pattern, d) removing areas of the metal foil to expose the rubber in said pattern, e) attracting electrically conductive equiax particles to the exposed rubber areas and f) while moving the exposed adhesive layer in synchronism with the exposed rubber areas, pressing said attracted particles into the adhesive layer in said pattern.
Claim 12
Dependent Claim
112 words
Method of modifying a conventional adhesive tape having an exposed adhesive layer to make that layer electrically conductive, said method comprising the steps of a) coating one face of a metal foil with rubber and the other face with a photoresist, b) exposing the photoresist to light in a predetermined pattern, c) removing areas of the photoresist corresponding to said pattern, d) removing areas of the metal foil to expose the rubber in said pattern, e) attracting electrically conductive equiax particles to the exposed rubber areas and f) while moving the exposed adhesive layer in synchronism with the exposed rubber areas, pressing said attracted particles into the adhesive layer in said pattern.
References Cited (Backward Citations)
No citation records indexed.
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