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.
Claims6
An 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 after heating for 30 minutes at 370° C.,
- wherein said tetrafluoroethylene/hexafluoro-propylene 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, —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.
Dependencies are inferred from the claim text.