GB2377449A - Electrically conductive polymer composition - Google Patents

Electrically conductive polymer composition Download PDF

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Publication number
GB2377449A
GB2377449A GB0117853A GB0117853A GB2377449A GB 2377449 A GB2377449 A GB 2377449A GB 0117853 A GB0117853 A GB 0117853A GB 0117853 A GB0117853 A GB 0117853A GB 2377449 A GB2377449 A GB 2377449A
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United Kingdom
Prior art keywords
composition
polymeric material
composition according
metal fibres
article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0117853A
Other versions
GB0117853D0 (en
Inventor
Michael Patrick Sayers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB0117853D0 publication Critical patent/GB0117853D0/en
Publication of GB2377449A publication Critical patent/GB2377449A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

An electrically conductive composition comprises a polymeric material and a plurality of metal fibres dispersed within the polymeric material, the polymeric material comprising 30% to 75% by weight of the composition, and the metal fibres comprising 25% to 70% by weight of the composition. The composition may be used to produce moulded electrically conductive polymeric articles, to prevent electrostatic discharges or to earth electrical devices.

Description

<Desc/Clms Page number 1>
Electrically Conductive Composition The present invention relates to electrically conductive compositions, and to their use to prevent electrostatic discharges and to earth electrical devices.
It is known to incorporate metal fibres into polymeric materials in order to provide a degree of electrical conductivity to the material. However, the proportion of metal fibres in the polymeric material tends to be small, and typically of the order to 2% by weight of the composition, and no more than 15% by weight of the composition (based upon the total weight of the polymeric material and the metal fibres).
According to a first aspect, the present invention provides an electrically conductive composition comprising a polymeric material and a plurality of metal fibres dispersed within the polymeric material, the polymeric material comprising 30% to 75% by weight of the composition, and the metal fibres comprising 25% to 70% by weight of the composition, based upon the total weight of the polymeric material and the metal fibres.
According to a second aspect, the invention provides an article formed from an electrically conductive composition according to the first aspect of the invention. Preferably the article is a moulded article.
According to a third aspect, the invention provides the use of a composition according to the first aspect of the invention, or an article according to the second aspect of the invention, for preventing electrostatic discharges.
According to a fourth aspect, the invention provides the use of a composition according to the first aspect of the invention, or an article
<Desc/Clms Page number 2>
according to the second aspect of the invention, for providing an electrical connection in order to earth an electrical device.
The inventor of the present invention has surprisingly found that by using a high proportion of metal fibres, i. e. in the range 25% to 70% by weight based upon the total weight of the metal fibres and the polymeric material, a highly electrically conductive polymer material which retains its structural integrity and mouldability may be formed.
A preferred compositional range is 30% to 60%, more preferably 40% to 55%, for example approximately 50%, by weight of the metal fibres based upon the total weight of the metal fibres and the polymeric material.
The inventor has found that the composition according to the invention conducts an electrical current when a low voltage (i. e. less than 100 volts, preferably less than 20 volts) is applied across the composition. For example, a sample moulding in the form of a substantially square cross-section block with dimensions 90 mm x 90 mm x 1.5 mm was electrically tested by applying a potential difference of 9 volts across one of the long dimensions of the moulding (i. e. a distance of 90 mm) and was found to draw a current of 0.16 amperes. An electrical resistance measurement carried out by placing an ohm meter test probe on an external surface of the sample moulding recorded a resistance of 0.001 mV.
The metal fibres preferably comprise steel fibres, and more preferably they comprise stainless steel fibres.
The metal fibres each have a length preferably in the range 2 mm to 20 mm, more preferably in the range 3 mm to 10 mm, for example 4,5 or 6 mm.
Preferably the metal fibres each have a diameter in the range 4 um to 30 um, more preferably in the range 6 am to 15 um, for example 8 jum or 11
<Desc/Clms Page number 3>
) m.
The polymeric material preferably comprises a thermoplastic material.
Alternatively, however, the polymeric material may comprise a thermosetting material.
Advantageously, the polymeric material may comprise a polyolefin and/or a polystyrene and/or a polyvinyl material. The polymeric material may, in fact, comprise a mixture of two or more different polymers. An especially preferred polymeric material is polypropylene.
Articles according to the invention preferably are made by mixing pellets or granules (or the like) of the polymeric material with the metal fibres, and heating the pellets or granules until the polymeric material melts. The molten composition preferably is processed, for example by moulding it into the desired shape, and/or by extruding the composition, and/or by any other polymer processing technique.
A particularly preferred electrically conductive article in accordance with the invention comprises a furniture component or a room partitioning component for preventing electrostatic discharges from furniture or room partitions. For example, the article may be a cap suitable for mounting on an end of a metal post (or the like) such that metal partitioning panels mounted on the post are electrically connected to each other. By the use of such electrically conductive caps, the panels may be earthed, thereby preventing electrostatic discharges.
Other preferred electrically conductive articles according to the invention include automotive components, for example lamp fittings, radios etc, and any other components which are required to be earthed. Forming the housing of such components from the electrically conductive composition according to the invention provides a simple means for earthing the
<Desc/Clms Page number 4>
components. In fact, the invention is generally applicable to substantially any electrical device which requires earthing.
Another use for the invention is to form polymeric articles from the electrically conductive composition, where such articles require painting and the article would normally require a conductive coating in order to make an electrical connection with the article to facilitate paint spraying of the article.
By using an electrically conductive composition in accordance with the invention, an additional conductive coating is not required.

Claims (14)

Claims
1. An electrically conductive composition comprising a polymeric material and a plurality of metal fibres dispersed within the polymeric material, the polymeric material comprising 30% to 75% by weight of the composition, and the metal fibres comprising 25% to 70% by weight of the composition, based upon the total weight of the polymeric material and the metal fibres.
2. A composition according to Claim 1, in which the metal fibres comprise steel fibres.
3. A composition according to Claim 2, in which the metal fibres comprise stainless steel fibres.
4. A composition according to any preceding claim, in which the metal fibres each have a length in the range 2 mm to 20 mm.
5. A composition according to Claim 4, in which the metal fibres each have a length in the range 3 mm to 10 mm.
6. A composition according to any preceding claim, in which the metal fibres each have a diameter in the range 4 am to 30 m.
7. A composition according to claim 6, in which the metal fibres each have a diameter in the range 6 J. m to 15 11m.
8. A composition according to any preceding claim, in which the polymeric material comprises a thermoplastic material.
9. A composition according to any preceding claim, in which the polymeric material comprises a thermosetting material.
<Desc/Clms Page number 6>
10. A composition according to any preceding claim, in which the polymeric material comprises a polyolefin and/or a polystyrene and/or a polyvinyl material.
11. An article formed from an electrically conductive composition according to any preceding claim.
12. An article according to Claim 11, which is a moulded article.
13. An article accord ing 10 Claim 11 or Claim 12, which comprises a furniture component or a room partitioning component for preventing electrostatic discharges from furniture or room partitions.
13. The use of a composition or article according to any preceding claim, for preventing electrostatic discharges.
14. The use of a composition or article according to any preceding claim, for providing an electrical connection in order to earth an electrical device.
GB0117853A 2001-07-09 2001-07-23 Electrically conductive polymer composition Withdrawn GB2377449A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0116700A GB0116700D0 (en) 2001-07-09 2001-07-09 Electrically conductive composition

Publications (2)

Publication Number Publication Date
GB0117853D0 GB0117853D0 (en) 2001-09-12
GB2377449A true GB2377449A (en) 2003-01-15

Family

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Family Applications (2)

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GB0116700A Ceased GB0116700D0 (en) 2001-07-09 2001-07-09 Electrically conductive composition
GB0117853A Withdrawn GB2377449A (en) 2001-07-09 2001-07-23 Electrically conductive polymer composition

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0116700A Ceased GB0116700D0 (en) 2001-07-09 2001-07-09 Electrically conductive composition

Country Status (1)

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GB (2) GB0116700D0 (en)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004113933A2 (en) * 2003-06-16 2004-12-29 Integral Technologies, Inc. Low cost electronic probe devices manufactured from conductive loaded resin-based materials
WO2005004287A2 (en) * 2003-07-02 2005-01-13 Integral Technologies, Inc. Low cost electrical cable connector housings and cable heads manufactured from conductive loaded resin-based materials
US6940468B2 (en) 2001-02-15 2005-09-06 Integral Technologies, Inc. Transformers or inductors (“transductors”) and antennas manufactured from conductive loaded resin-based materials
US6947012B2 (en) 2001-02-15 2005-09-20 Integral Technologies, Inc. Low cost electrical cable connector housings and cable heads manufactured from conductive loaded resin-based materials
US6947005B2 (en) 2001-02-15 2005-09-20 Integral Technologies, Inc. Low cost antennas and electromagnetic (EMF) absorption in electronic circuit packages or transceivers using conductive loaded resin-based materials
WO2005089187A2 (en) * 2004-03-12 2005-09-29 Integral Technologies, Inc. Low cost method to form solderable contact points for structures manufactured from conductive loaded resin- based materials
WO2005117053A2 (en) * 2004-05-06 2005-12-08 Integral Technologies, Inc. Low cost electrical fuses manufactured from conductive loaded resin-based materials
WO2005119876A1 (en) * 2004-04-13 2005-12-15 Integral Technologies, Inc. Low cost charger connections manufactured from conductive loaded resin-based material
WO2005120798A2 (en) * 2004-06-08 2005-12-22 Integral Technologies, Inc. Low cost housings for vehicle mechanical devices and systems manufactured from conductive loaded resin-based materials
WO2006017289A1 (en) * 2004-07-12 2006-02-16 Integral Technologies, Inc. Low cost vehicle air intake and exhaust handling devices manufactured from conductive loaded resin-based materials
US7002234B2 (en) 2001-02-15 2006-02-21 Integral Technologies, Inc. Low cost capacitors manufactured from conductive loaded resin-based materials
US7006050B2 (en) 2001-02-15 2006-02-28 Integral Technologies, Inc. Low cost antennas manufactured from conductive loaded resin-based materials having a conducting wire center core
US7006046B2 (en) 2001-02-15 2006-02-28 Integral Technologies, Inc. Low cost electronic probe devices manufactured from conductive loaded resin-based materials
US7027304B2 (en) 2001-02-15 2006-04-11 Integral Technologies, Inc. Low cost thermal management device or heat sink manufactured from conductive loaded resin-based materials
US7084826B2 (en) 2001-02-15 2006-08-01 Integral Technologies, Inc. Low cost inductor devices manufactured from conductive loaded resin-based materials
US7115825B2 (en) 2001-02-15 2006-10-03 Integral Technologies, Inc. Low cost key actuators and other switching device actuators manufactured from conductive loaded resin-based materials
US7136008B2 (en) 2001-02-15 2006-11-14 Integral Technologies, Inc. Low cost electromagnetic energy absorbers manufactured from conductive loaded resin-based materials
US7164388B2 (en) 2001-02-15 2007-01-16 Integral Technologies, Inc. Low cost adjustable RF resonator devices manufactured from conductive loaded resin-based materials
US7182889B2 (en) 2001-02-15 2007-02-27 Integral Technologies, Inc. Low cost roofing shingles manufactured from conductive loaded resin-based materials
US7224108B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
US7222727B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost food processing belts and other conveyances manufactured from conductive loaded resin-based materials
US7223469B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Electriplast moldable composite capsule
US7223144B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
US7244890B2 (en) 2001-02-15 2007-07-17 Integral Technologies Inc Low cost shielded cable manufactured from conductive loaded resin-based materials
US7268637B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost RF oscillator devices manufactured from conductive loaded resin-based materials
US7268479B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost lighting circuits manufactured from conductive loaded resin-based materials
US7268461B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost electrical motor components manufactured from conductive loaded resin-based materials
US7317420B2 (en) 2001-02-15 2008-01-08 Integral Technologies, Inc. Low cost omni-directional antenna manufactured from conductive loaded resin-based materials
US7372006B2 (en) 2001-02-15 2008-05-13 Integral Technologies, Inc Low cost heating devices manufactured from conductive loaded resin-based materials
US7425885B2 (en) 2001-02-15 2008-09-16 Integral Technologies, Inc. Low cost electrical fuses manufactured from conductive loaded resin-based materials
US7726440B2 (en) 2001-02-15 2010-06-01 Integral Technologies, Inc. Low cost vehicle electrical and electronic components and systems manufactured from conductive loaded resin-based materials
US7829006B2 (en) 2001-02-15 2010-11-09 Integral Technologies, Inc. Method to form vehicle component devices from conductive loaded resin-based materials
US8268222B2 (en) 2001-02-15 2012-09-18 Integral Technologies, Inc. Methods of making electrical motor components from conductive loaded resin-based materials

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632792A (en) * 1968-11-29 1972-01-04 Monsanto Co Steel-reinforced composite
EP0099573A1 (en) * 1982-07-19 1984-02-01 Diamond Shamrock Chemicals Company Improved conductive resinous composites
US4678602A (en) * 1983-05-16 1987-07-07 Daicel Chemical Industries, Ltd. Highly conductive styrenic resin composition
WO1988006342A1 (en) * 1985-08-23 1988-08-25 General Electric Company Electrically conductive material for molding
US5240645A (en) * 1989-08-07 1993-08-31 United Technologies Automotive, Inc. Weldable sealant containing electrically conductive fibers
EP0874024A1 (en) * 1996-11-14 1998-10-28 Kawasaki Steel Corporation Long glass fiber-reinforced conductive thermoplastic resin molding and process for preparing the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632792A (en) * 1968-11-29 1972-01-04 Monsanto Co Steel-reinforced composite
EP0099573A1 (en) * 1982-07-19 1984-02-01 Diamond Shamrock Chemicals Company Improved conductive resinous composites
US4678602A (en) * 1983-05-16 1987-07-07 Daicel Chemical Industries, Ltd. Highly conductive styrenic resin composition
WO1988006342A1 (en) * 1985-08-23 1988-08-25 General Electric Company Electrically conductive material for molding
US5240645A (en) * 1989-08-07 1993-08-31 United Technologies Automotive, Inc. Weldable sealant containing electrically conductive fibers
EP0874024A1 (en) * 1996-11-14 1998-10-28 Kawasaki Steel Corporation Long glass fiber-reinforced conductive thermoplastic resin molding and process for preparing the same

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7244890B2 (en) 2001-02-15 2007-07-17 Integral Technologies Inc Low cost shielded cable manufactured from conductive loaded resin-based materials
US7268637B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost RF oscillator devices manufactured from conductive loaded resin-based materials
US6940468B2 (en) 2001-02-15 2005-09-06 Integral Technologies, Inc. Transformers or inductors (“transductors”) and antennas manufactured from conductive loaded resin-based materials
US6947012B2 (en) 2001-02-15 2005-09-20 Integral Technologies, Inc. Low cost electrical cable connector housings and cable heads manufactured from conductive loaded resin-based materials
US6947005B2 (en) 2001-02-15 2005-09-20 Integral Technologies, Inc. Low cost antennas and electromagnetic (EMF) absorption in electronic circuit packages or transceivers using conductive loaded resin-based materials
US8268222B2 (en) 2001-02-15 2012-09-18 Integral Technologies, Inc. Methods of making electrical motor components from conductive loaded resin-based materials
US7115825B2 (en) 2001-02-15 2006-10-03 Integral Technologies, Inc. Low cost key actuators and other switching device actuators manufactured from conductive loaded resin-based materials
US7726440B2 (en) 2001-02-15 2010-06-01 Integral Technologies, Inc. Low cost vehicle electrical and electronic components and systems manufactured from conductive loaded resin-based materials
US7084826B2 (en) 2001-02-15 2006-08-01 Integral Technologies, Inc. Low cost inductor devices manufactured from conductive loaded resin-based materials
US7425885B2 (en) 2001-02-15 2008-09-16 Integral Technologies, Inc. Low cost electrical fuses manufactured from conductive loaded resin-based materials
US7372006B2 (en) 2001-02-15 2008-05-13 Integral Technologies, Inc Low cost heating devices manufactured from conductive loaded resin-based materials
US7002234B2 (en) 2001-02-15 2006-02-21 Integral Technologies, Inc. Low cost capacitors manufactured from conductive loaded resin-based materials
US7006050B2 (en) 2001-02-15 2006-02-28 Integral Technologies, Inc. Low cost antennas manufactured from conductive loaded resin-based materials having a conducting wire center core
US7006046B2 (en) 2001-02-15 2006-02-28 Integral Technologies, Inc. Low cost electronic probe devices manufactured from conductive loaded resin-based materials
US7317420B2 (en) 2001-02-15 2008-01-08 Integral Technologies, Inc. Low cost omni-directional antenna manufactured from conductive loaded resin-based materials
US7268461B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost electrical motor components manufactured from conductive loaded resin-based materials
US7027304B2 (en) 2001-02-15 2006-04-11 Integral Technologies, Inc. Low cost thermal management device or heat sink manufactured from conductive loaded resin-based materials
US7268479B2 (en) 2001-02-15 2007-09-11 Integral Technologies, Inc. Low cost lighting circuits manufactured from conductive loaded resin-based materials
US7223144B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
US7829006B2 (en) 2001-02-15 2010-11-09 Integral Technologies, Inc. Method to form vehicle component devices from conductive loaded resin-based materials
US7223469B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Electriplast moldable composite capsule
US7164388B2 (en) 2001-02-15 2007-01-16 Integral Technologies, Inc. Low cost adjustable RF resonator devices manufactured from conductive loaded resin-based materials
US7182889B2 (en) 2001-02-15 2007-02-27 Integral Technologies, Inc. Low cost roofing shingles manufactured from conductive loaded resin-based materials
US7224108B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost spark plug manufactured from conductive loaded resin-based materials
US7222727B2 (en) 2001-02-15 2007-05-29 Integral Technologies, Inc. Low cost food processing belts and other conveyances manufactured from conductive loaded resin-based materials
US7136008B2 (en) 2001-02-15 2006-11-14 Integral Technologies, Inc. Low cost electromagnetic energy absorbers manufactured from conductive loaded resin-based materials
WO2004113933A2 (en) * 2003-06-16 2004-12-29 Integral Technologies, Inc. Low cost electronic probe devices manufactured from conductive loaded resin-based materials
WO2004113933A3 (en) * 2003-06-16 2006-03-02 Integral Technologies Inc Low cost electronic probe devices manufactured from conductive loaded resin-based materials
WO2005004287A2 (en) * 2003-07-02 2005-01-13 Integral Technologies, Inc. Low cost electrical cable connector housings and cable heads manufactured from conductive loaded resin-based materials
WO2005004287A3 (en) * 2003-07-02 2005-10-06 Integral Technologies Inc Low cost electrical cable connector housings and cable heads manufactured from conductive loaded resin-based materials
WO2005089187A3 (en) * 2004-03-12 2007-11-15 Integral Technologies Inc Low cost method to form solderable contact points for structures manufactured from conductive loaded resin- based materials
WO2005089187A2 (en) * 2004-03-12 2005-09-29 Integral Technologies, Inc. Low cost method to form solderable contact points for structures manufactured from conductive loaded resin- based materials
WO2005119876A1 (en) * 2004-04-13 2005-12-15 Integral Technologies, Inc. Low cost charger connections manufactured from conductive loaded resin-based material
WO2005117053A3 (en) * 2004-05-06 2006-05-04 Integral Technologies Inc Low cost electrical fuses manufactured from conductive loaded resin-based materials
WO2005117053A2 (en) * 2004-05-06 2005-12-08 Integral Technologies, Inc. Low cost electrical fuses manufactured from conductive loaded resin-based materials
WO2005120798A3 (en) * 2004-06-08 2006-03-30 Integral Technologies Inc Low cost housings for vehicle mechanical devices and systems manufactured from conductive loaded resin-based materials
WO2005120798A2 (en) * 2004-06-08 2005-12-22 Integral Technologies, Inc. Low cost housings for vehicle mechanical devices and systems manufactured from conductive loaded resin-based materials
WO2006017289A1 (en) * 2004-07-12 2006-02-16 Integral Technologies, Inc. Low cost vehicle air intake and exhaust handling devices manufactured from conductive loaded resin-based materials

Also Published As

Publication number Publication date
GB0117853D0 (en) 2001-09-12
GB0116700D0 (en) 2001-08-29

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