US3132204A - Electrically conductive pressure sensitive adhesive tapes - Google Patents

Electrically conductive pressure sensitive adhesive tapes Download PDF

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US3132204A
US3132204A US3132204DA US3132204A US 3132204 A US3132204 A US 3132204A US 3132204D A US3132204D A US 3132204DA US 3132204 A US3132204 A US 3132204A
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adhesive
metal
conductive
electrically
stripes
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/10Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable

Description

May 5, 1964 w. GIELLERUP 3,132,204

ELECTRICALLY CONDUCTIVE PRESSURE SENSITIVE ADHESIVE TAPES Filed July 27, 1962 INVENTOR.

i ,4rge vzy United States Patent 3 132,204 ELECTRICALLY C ONDUCTIVE PRESSURE SENSITIVE ADHESIVE TAPES Leon W. Giellerup, 527 Smith Place, Ridgewood, NJ. Filed July 27, 1962, Ser. No. 212,874 6 Claims. (Cl. 174-117) This invention relates to adhesive tapes and is more particularly concerned with electrically conductive pressure sensitive adhesive tapes.

conductive medium, the latter of which is generally a powdered substance, causes these particles to become coated with the adhesive, which in itself is inherently a non-conductor. Furthermore, the surfaces of powdered materials malnng up the electrically conductive medium, which are generally of metal such as aluminum, copper, silver, etc., tend to oxidize, and this oxidation causes the metal particles to lose their electrically conductive propertics, thus diminishing the ability of the metal particles to pass on the current.

Another disadvantage of electrically conductive adhesive tapes, where silver particles re used as the conductive medium, is that the relatively high cost of the silver particles makes the cost of this type of electrically conductive tape prohibitive for most conventional uses.

The present invention is intended to overcome the disadvantages specified above. In the first place, it has been found that a non-oxidizing material which has electricaily conductive properties may be employed with advantage in the production of electrically conductive adhesive tapes. In addition, this inventor has found that the particles of electrically conductive material may be cast on the pressure sensitive adhesive tape in such a manner that the coating of the individual particles of the electrically conductive material is avoided. It has, furthermore, been found that where this electrically conduct ve material is compacted by rolling under pressure, its conductivity is increased and resistance is substantially reduced.

The new article of manufacture produced in accordance with the invention lso has novel characteristics which allow the tape to conform to irregular surfaces, and to provide additional strength and tear resistance.

For a better understanding of this invention, reference is made to the drawings, in which:

FIGURE 1 is a perspective view on an enlarged scale of the conductive tape of this invention; and

FIGURE 2 is an end elevational view of said tape.

Referring to the drawings, 10 represents a ribbon or strip of metal foil of indefinite length, the outer edges of which are crimped at 11A and 11B to form a fold on each side of the metal strip. The ribbon of metal foil 10 may be of aluminum, copper or other conductive metal, or other conductive materials, which may bo'produced in thin sheets or strips. In the preferred form, the metal strip 10 is of an aluminum foil, whichis referred to as "dead soft," in which the temper or stiffness has been removed, so that the foil is readily ductile. The resulting ductility of the foil permits the tape to conform easily and permanently to irregular surfaces or objects. The thickness of the metal foil may vary with the needs and uses of the tape, but, for the usual purposes, a foil thickness of 0.002 inch is preferable.

A layer 12 of pressure sensitive adhesive is then cast upon the metal strip 10, so that the adhesive overlies the 3,132,204 Patented May 5, 1964 entire upper surface of the strip, including the crimped outer edges 11A and 113. After the layer 12 of adhesive has been cast on the strip 10, one or more stripes 13 of electrically conductive material are laid over the upper face of the pressure sensitiveadhesive, as shown in FIG URE 1 of the drawings, and the tape is then passed between a pair ofpressure rollers which compact and flatten the stripes of metal foil and the adhesive. The compacting of the stripes 13 of metal foil and the adhesive tends to increase the conductivity of the electrically conductive materials.

In the casting of the layer 12 of pressure sensitive adhesive on the metal strip 10, it has been found that vinyl ethyl ether polymer, such as that having high molecular weight and a reduced viscosity at 20 C. of 3.5 to 4.5, and a specific gravity at 20 C. of .0968, is satisfactory for this purpose and provides a favorable medium in the adhesive itself.

In the use of the stripes 13 of electrically conductive material which are laid over the upper surface of the adhesive material 12, I prefer to employ metal powders of particles which are-corrosion resistant, such as corrosion-resistant copper powder having large particle size, of which 2% will pass through 150 mesh and from 55% to 70% will pass through 325 mesh. An example of the type of copper powder having the above characteristics is Resistox No. 150 RXA or No. 150 RXS, such as is used in the manufacture of sintered metal parts. Powdered aluminum which is corrosion-resistant has also been found satisfactory for this purpose.

A plurality of the stripes 13 of the corrosion-resistant metal powder is laid lengthwise the tape and over the adhesive 12, as shown in FIGURE 1. The tape is then passed between rollers which serve'to compact and flatten the stripes. The compacting of the adhesive and the stripes of metal powder increases the conductivity of the electrically conductive metal powders, without coating the metal particles with the adhesive material.

A strip of easily removable release paper 14 is then placed over the exposed surface ofthe adhesive 12 and the stripes 13 to protect the adhesive, and to prevent the adhesive from adhering to the metal foil backing when the tape is rolled up for shipment or storage. Also, the adhesive-free side of the metal foil backing 10 may be treated with conventional coatings of materials, such as silicones, to protect it and to prevent it from adhering to the adhesive surface when rolled and stored, thus avoiding the need to use release paper over the adhesive face.

In the preparation of the electrically conductive pressure sensitive adhesive tapes of this invention, it is important that the pressure sensitive adhesive not be permitted to coat the particles of the cross-section of the stripes of conductive materials applied in stripes to the upper surface of the adhesive. By the use of stripes of the electrically conductive metal powders, as shown and described above, the particles of metal producing the conductive characteristics are not isolated from each other and are in continuous contact. In addition, ,by keeping the particles of conductive material substantially out of direct contact with the adhesive, the corrosive effects of the adhesive upon the metal particles is minimized. It has also been found that an increase in the particle size (if the conductive material results in improved conduct vity.

In the use of the electrically conductive pressure sensitive tape, as shown and described above, the electrical conductivity showed low resistance and high inductance after prolonged use.

Having described my invention, I claim:

1. In a new article of manufacture, the combination of a metallic backing comprising a ribbon of metal foil, the outer edges of which are crimped to form a fold on each side of said ribbon, a layer of pressure sensitive adhesive overlying the upper surface of said ribbon, a plurality of stripes of compacted electrically conductive material overlying the upper face of the adhesive and lengthwise thereof, and a sheet of removable release paper overlying the exposed face of the adhesive and the stripes of electrically conductive material to protect the adhesive.

2. In a new article of manufacture, the combination of a flexible metal backing comprising a ribbon of metal foil, the outer edges of which are folded on each side of said ribbon, a layer of pressure sensitive adhesive overlying the upper surface of said ribbon, a plurality of stripes of compacted metal particles overlying the exposed face of the adhesive and extending lengthwise thereof, and a sheet of removable release paper covering the exposed face of the adhesive.

3. In a new article of manufacture, the combination of a ribbon of flexible metal foil, the outer edges of which are folded, a layer of pressure sensitive adhesive overlying the upper surface and the folded edges of said ribbon, and a plurality of stripes of compacted electrically conductive particles running lengthwise said ribbon and overlying the exposed face of the adhesive.

4. In a new article of manufacture, the combination of a ribbon of flexible metal foil, a layer of adhesive overlying one surface of said ribbon, and a plurality of stripes of metal particles overlying exposed face of the adhesive and extending lengthwise the ribbon.

5. In the production of electrically conductive adhesive 6. In the production of electrically conductive adhesive tape, the method of crimping the outside edges of a ribbon of metal foil of indefinite length" to form a fold on each side of said ribbon, casting a layer of adhesive over the upper surface of said ribbon and the crimped edges, laying a plurality of continuous stripes of electrically conductive powdered metal over the adhesive, said stripes extending lengthwise the adhesive, compacting the adhesive and the continuous stripes, and placing a strip of easily removable release paper over the exposed surface of the adhesive and the stripes.

References Cited in the file of this patent UNITED STATES PATENTS 1,984,356 Abott Dec. 18, 1934 2,831,049 Carbral Apr. 15, 1958 2,852,423 Bassett Sept. 16, 1958 3,029,303 Severino Apr. 10, 1962 3,060,062 Katz et al Oct. 23, 1962

Claims (1)

1. IN A NEW ARTICLE OF MANUFACTURE, THE COMBINATION OF A METALLIC BACKING COMPRISING A RIBBON OF METAL FOIL, THE OUTER EDGES OF WHICH ARE CRIMPED TO FORM A FOLD ON EACH SIDE OF SAID RIBBON, A LAYER OF PRESSURE SENSITIVE ADHESIVE OVERLYING THE UPPER SURFACE OF SAID RIBBON, A PLURALITY OF STRIPES OF COMPACTED ELECTRICALLY CONDUCTIVE MATERIAL OVERLYING THE UPPER FACE OF THE ADHESIVE AND LENGTHWISE THEREOF, AND A SHEET OF REMOVABLE RELEASE PAPER OVERLYING THE
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Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255337A (en) * 1963-09-23 1966-06-07 Arnold F Willat Electrical heating pad for floors
US3384951A (en) * 1965-04-23 1968-05-28 Aluminum Co Of America Composite aluminous product and method
US3391455A (en) * 1963-12-26 1968-07-09 Matsushita Electric Ind Co Ltd Method for making printed circuit boards
US3392899A (en) * 1964-11-03 1968-07-16 Norton Co Pressure sensitive tapes with solderable layer
US3464617A (en) * 1965-06-09 1969-09-02 Rand Dev Corp Sweat solder form
US3524921A (en) * 1968-06-07 1970-08-18 Leo Wolf Two-lead strip cable and sliding connector therefor
US3696412A (en) * 1970-10-19 1972-10-03 Dake Corp Method and means for indicating tension
US3703603A (en) * 1971-05-10 1972-11-21 Circuit Stik Inc Rub-on sub-element for electronic circuit board
US3832598A (en) * 1972-10-02 1974-08-27 Minnesota Mining & Mfg Electrically conductive tape device
US3928692A (en) * 1973-05-02 1975-12-23 Peter P Pellegrino Composite plating tape
US3967994A (en) * 1974-10-09 1976-07-06 Langberg Associates, Inc. Method of inspection for splices used for joining webs in a manufacturing process
US4172547A (en) * 1978-11-02 1979-10-30 Delgrande Donald J Method for soldering conventionally unsolderable surfaces
US4252847A (en) * 1978-11-02 1981-02-24 Delgrande Donald J Stained glass structure
US4543958A (en) * 1979-04-30 1985-10-01 Ndm Corporation Medical electrode assembly
US4546037A (en) * 1984-09-04 1985-10-08 Minnesota Mining And Manufacturing Company Flexible tape having stripes of electrically conductive particles for making multiple connections
US4548862A (en) * 1984-09-04 1985-10-22 Minnesota Mining And Manufacturing Company Flexible tape having bridges of electrically conductive particles extending across its pressure-sensitive adhesive layer
US4568602A (en) * 1983-01-24 1986-02-04 Minnesota Mining And Manufacturing Company Sheet material adapted to provide long-lived stable adhesive-bonded electrical connections
US4569877A (en) * 1982-12-20 1986-02-11 Minnesota Mining And Manufacturing Company Sheet material adapted to provide long-lived stable adhesive-bonded electrical connections
US4584962A (en) * 1979-04-30 1986-04-29 Ndm Corporation Medical electrodes and dispensing conditioner therefor
US4590089A (en) * 1979-04-30 1986-05-20 Ndm Corporation Medical electrodes and dispensing conditioner therefor
US4606962A (en) * 1983-06-13 1986-08-19 Minnesota Mining And Manufacturing Company Electrically and thermally conductive adhesive transfer tape
US4610908A (en) * 1981-12-28 1986-09-09 Minnesota Mining And Manufacturing Company Insulated connected sheet material
US4674511A (en) * 1979-04-30 1987-06-23 American Hospital Supply Corporation Medical electrode
US4838273A (en) * 1979-04-30 1989-06-13 Baxter International Inc. Medical electrode
US4931598A (en) * 1988-12-30 1990-06-05 3M Company Electrical connector tape
US5028739A (en) * 1989-04-13 1991-07-02 Chomerics, Inc. EMI/REI shielding gasket
US5221417A (en) * 1992-02-20 1993-06-22 At&T Bell Laboratories Conductive adhesive film techniques
US5328376A (en) * 1987-04-03 1994-07-12 West Frederick A Patterned laminar electrical interconnection
US5416622A (en) * 1993-02-01 1995-05-16 Minnesota Mining And Manufacturing Company Electrical connector
US5538581A (en) * 1995-02-02 1996-07-23 Davidson Textron Inc. Method for electromagnetically welding thermoplastic articles together
US5763112A (en) * 1995-03-17 1998-06-09 Tv Interactive Data Corporation Method and structure for attaching a battery to an electrical device
US5911582A (en) * 1994-07-01 1999-06-15 Tv Interactive Data Corporation Interactive system including a host device for displaying information remotely controlled by a remote control
US20090324883A1 (en) * 2008-06-27 2009-12-31 Liberman Distributing and Manufacturing Co. d/b/a Lidco Products Extendable self-supporting material
US9095422B2 (en) 2010-07-02 2015-08-04 Liberman Distributing And Manufacturing Co. Method and structure for nasal dilator
CN104951156A (en) * 2014-03-31 2015-09-30 宸盛光电有限公司 Capacitive touch control device
US9427945B2 (en) 2011-12-30 2016-08-30 Liberman Distributing And Manufacturing Co. Extendable self-supporting material composites and manufacture thereof
US9923320B1 (en) * 2016-12-19 2018-03-20 David R. Hall Electrical interconnection system for connecting multiple electrical modules to an electrical device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1984356A (en) * 1931-12-10 1934-12-18 Bryant Electric Co Electric wiring system
US2831049A (en) * 1956-01-18 1958-04-15 Seth M Cabral Electrical conductor with adhesive backing
US2852423A (en) * 1955-03-18 1958-09-16 Bassett Res Corp Shielding adhesive tape
US3029303A (en) * 1958-12-02 1962-04-10 Severino James Adhesively secured electrical devices
US3060062A (en) * 1960-03-02 1962-10-23 Rca Corp Method of forming electrical conductors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1984356A (en) * 1931-12-10 1934-12-18 Bryant Electric Co Electric wiring system
US2852423A (en) * 1955-03-18 1958-09-16 Bassett Res Corp Shielding adhesive tape
US2831049A (en) * 1956-01-18 1958-04-15 Seth M Cabral Electrical conductor with adhesive backing
US3029303A (en) * 1958-12-02 1962-04-10 Severino James Adhesively secured electrical devices
US3060062A (en) * 1960-03-02 1962-10-23 Rca Corp Method of forming electrical conductors

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255337A (en) * 1963-09-23 1966-06-07 Arnold F Willat Electrical heating pad for floors
US3391455A (en) * 1963-12-26 1968-07-09 Matsushita Electric Ind Co Ltd Method for making printed circuit boards
US3392899A (en) * 1964-11-03 1968-07-16 Norton Co Pressure sensitive tapes with solderable layer
US3384951A (en) * 1965-04-23 1968-05-28 Aluminum Co Of America Composite aluminous product and method
US3464617A (en) * 1965-06-09 1969-09-02 Rand Dev Corp Sweat solder form
US3524921A (en) * 1968-06-07 1970-08-18 Leo Wolf Two-lead strip cable and sliding connector therefor
US3696412A (en) * 1970-10-19 1972-10-03 Dake Corp Method and means for indicating tension
US3703603A (en) * 1971-05-10 1972-11-21 Circuit Stik Inc Rub-on sub-element for electronic circuit board
US3832598A (en) * 1972-10-02 1974-08-27 Minnesota Mining & Mfg Electrically conductive tape device
US3928692A (en) * 1973-05-02 1975-12-23 Peter P Pellegrino Composite plating tape
US3967994A (en) * 1974-10-09 1976-07-06 Langberg Associates, Inc. Method of inspection for splices used for joining webs in a manufacturing process
US4172547A (en) * 1978-11-02 1979-10-30 Delgrande Donald J Method for soldering conventionally unsolderable surfaces
US4252847A (en) * 1978-11-02 1981-02-24 Delgrande Donald J Stained glass structure
US4543958A (en) * 1979-04-30 1985-10-01 Ndm Corporation Medical electrode assembly
US4838273A (en) * 1979-04-30 1989-06-13 Baxter International Inc. Medical electrode
US4674511A (en) * 1979-04-30 1987-06-23 American Hospital Supply Corporation Medical electrode
US4584962A (en) * 1979-04-30 1986-04-29 Ndm Corporation Medical electrodes and dispensing conditioner therefor
US4590089A (en) * 1979-04-30 1986-05-20 Ndm Corporation Medical electrodes and dispensing conditioner therefor
US4610908A (en) * 1981-12-28 1986-09-09 Minnesota Mining And Manufacturing Company Insulated connected sheet material
US4569877A (en) * 1982-12-20 1986-02-11 Minnesota Mining And Manufacturing Company Sheet material adapted to provide long-lived stable adhesive-bonded electrical connections
US4568602A (en) * 1983-01-24 1986-02-04 Minnesota Mining And Manufacturing Company Sheet material adapted to provide long-lived stable adhesive-bonded electrical connections
US4606962A (en) * 1983-06-13 1986-08-19 Minnesota Mining And Manufacturing Company Electrically and thermally conductive adhesive transfer tape
US4548862A (en) * 1984-09-04 1985-10-22 Minnesota Mining And Manufacturing Company Flexible tape having bridges of electrically conductive particles extending across its pressure-sensitive adhesive layer
US4546037A (en) * 1984-09-04 1985-10-08 Minnesota Mining And Manufacturing Company Flexible tape having stripes of electrically conductive particles for making multiple connections
US5328376A (en) * 1987-04-03 1994-07-12 West Frederick A Patterned laminar electrical interconnection
US4931598A (en) * 1988-12-30 1990-06-05 3M Company Electrical connector tape
US5028739A (en) * 1989-04-13 1991-07-02 Chomerics, Inc. EMI/REI shielding gasket
US5221417A (en) * 1992-02-20 1993-06-22 At&T Bell Laboratories Conductive adhesive film techniques
US5416622A (en) * 1993-02-01 1995-05-16 Minnesota Mining And Manufacturing Company Electrical connector
US5911582A (en) * 1994-07-01 1999-06-15 Tv Interactive Data Corporation Interactive system including a host device for displaying information remotely controlled by a remote control
US5538581A (en) * 1995-02-02 1996-07-23 Davidson Textron Inc. Method for electromagnetically welding thermoplastic articles together
US5763112A (en) * 1995-03-17 1998-06-09 Tv Interactive Data Corporation Method and structure for attaching a battery to an electrical device
US20090324883A1 (en) * 2008-06-27 2009-12-31 Liberman Distributing and Manufacturing Co. d/b/a Lidco Products Extendable self-supporting material
US9376600B2 (en) 2008-06-27 2016-06-28 Liberman Disbributing and Manufacturing Co. Extendable self-supporting material
US9447307B2 (en) 2008-06-27 2016-09-20 Liberman Distributing And Manufacturing Co. Extendable self-supporting material
US9095422B2 (en) 2010-07-02 2015-08-04 Liberman Distributing And Manufacturing Co. Method and structure for nasal dilator
US9427945B2 (en) 2011-12-30 2016-08-30 Liberman Distributing And Manufacturing Co. Extendable self-supporting material composites and manufacture thereof
CN104951156A (en) * 2014-03-31 2015-09-30 宸盛光电有限公司 Capacitive touch control device
EP2928080A1 (en) * 2014-03-31 2015-10-07 TPK Universal Solutions Limited Capacitive touch-sensitive device
US9923320B1 (en) * 2016-12-19 2018-03-20 David R. Hall Electrical interconnection system for connecting multiple electrical modules to an electrical device

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