Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B7/00—Insulated conductors or cables characterised by their form
  • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
  • H01B7/29—Protection against damage caused by extremes of temperature or by flame
  • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B7/00—Insulated conductors or cables characterised by their form
  • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
  • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
  • H01B7/2813—Protection against damage caused by electrical, chemical or water tree deterioration

Definitions

• This invention relates to plastics insulated wires.
• the invention provides a wire having an inner coating of a highly-insulative, halogen-free plastics material and a halogen-free, hard, flexible outer coating of a copolymer of, or a mixture of, a siloxane and a polyetherimide.
• the inner coating may be of any modified polyolefinic material which is halogen-free and which does not promote arc-tracking. It may be cross-linked by radiation but this is not necessary if a high temperature deformation resistance is inherent in the polymer, or is provided by some other means. Suitable materials, singly or in combination, are.. poly(ethylene vinyl acetate)-EVA or VAE; poly(ethylene); poly(butyleneteraphthalate)-PBT; a thermoplastic elastomer; and a cross-linked elastomer.
• the outer coating is of low flammability and is preferably cross-linkable.
• the siloxane may be polydimethylsiloxane or another substituted siloxane, and a suitable copolymer of polydimethylsiloxane and polyetherimide is available from General Electric Plastics Company (of the U.S.A.) under the trademark "SILTEM".
• SILTEM General Electric Plastics Company
• the insulation may be improved significantly by the addition of a layer of poly-ether-etherketone ("PEEK”) over the two coatings mentioned above.
• PEEK poly-ether-etherketone
• the flammability is lowered, the resistance to cut-through and abrasion is raised, and the resistance to attack by fluid or gaseous chemicals is improved. It is found surprisingly that this additional layer of PEEK does not significantly reduce the flexibility or resistance to arc tracking afforded by the first two coatings.
• An electric wire was made by coating a conductor with an extruded inner layer of modified polyethylene and then an extruded outer layer of "SILTEM" copolymer. The coated wire was then subjected to electron beam irradiation for cross-linking to a dose of 8 Mrad. in one case, and to 10, 12 and 15 Mrad. in other cases. All wires satisfied tests for vertical flammability, scrape abrasion, flexibility, arc tracking, cut-through resistance and resistance to oils and water.

Landscapes

• Organic Insulating Materials (AREA)
• Insulated Conductors (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (6)

Publications (1)

Family

ID=27264563

Family Applications (1)

Country Status (3)

Cited By (13)

Families Citing this family (2)

Citations (4)

• 1990
  • 1990-06-20 EP EP90306756A patent/EP0407061A1/fr not_active Withdrawn
  • 1990-07-04 BR BR909003180A patent/BR9003180A/pt not_active Application Discontinuation
  • 1990-07-04 JP JP17547590A patent/JPH0355713A/ja active Pending

Patent Citations (4)

Also Published As

Similar Documents

Legal Events