Fep pellet
AssigneeDaikin Industries, Ltd.
InventorsHideki KONO, Takayuki HIRAO, George LIN, Kazuyuki FUKUDA
Life of this patent
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Abstract
An FEP pellet having a volatile content of 0.2% by weight or less. The FEP pellet satisfies the following requirements (i) and (ii) when used to form a insulating material coating a core wire by extrusion coating at a coating speed of 2,800 ft/min.: (i) an adhesive strength between the insulating material and said core wire of 0.8 kg or more; and (ii) an average number of cone-breaks in the insulating material of one or less per 50,000 feet of the coated core wire.
Claims4
1-14. (canceled)
An insulating material formed from a FEP pellet, said FEP pellet comprising a tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether),
- having a melt flow rate of 30 (g/10 minutes) or more, and
- having a volatile content of 0.2% by weight or less,
- wherein said tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether) has an adhesion terminus,
- said adhesion terminus comprising at least one functional group species selected from the group consisting of —COOM, —SO3M, —OSO3M, —SO7F, —SO2Cl, —COF, —CH2OH, —CONH2 and —CF═CF2, and
- M being the same or different and representing an alkyl group, a hydrogen atom, a metallic cation or a quaternary ammonium cation.
An insulated cable comprising a core wire extrusion-coated with an insulating material prepared from a FEP pellet, said FEP pellet comprising a tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether),
- having a melt flow rate of 30 (g/10 minutes) or more, and
- having a volatile content of 0.2% by weight or less,
- wherein said tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether) has an adhesion terminus,
- said adhesion terminus comprising at least one functional group species selected from the group consisting of —COOM, —SO3M, —OSO3M, —SO2F, —SO2Cl, —COF, —CH2OH, —CONH, and —CF═CF2, and
- M being the same or different and representing an alkyl group, a hydrogen atom, a metallic cation or a quaternary ammonium cation.
A process for insulating a core wire,
- which comprises extrusion coating the core wire with a molten insulating material comprising a FEP pellet, said FEP pellet comprising a tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether),
- having a melt flow rate of 30 (g/10 minutes) or more, and
- having a volatile content of 0.2% by weight or less,
- wherein said tetrafluoroethylene/hexafluoropropylene copolymer modified with perfluoro(alkyl vinyl ether) has an adhesion terminus,
- said adhesion terminus comprising at least one functional group species selected from the group consisting of —COOM, —SO3M, —OSO3M, —SO2F, —SO2Cl, —COF, —CH2OH, —CONH, and —CF═CF2, and
- M being the same or different and representing an alkyl group, a hydrogen atom, a metallic cation or a quaternary ammonium cation.
Dependencies are inferred from the claim text.