Wire coating compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorPatricia A. Tooley
Life of this patent
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Abstract
A process for high speed melt extrusion onto wire conductors of fluoropolymer pigmented with oxide-coated titanium dioxide.
Claims20
A process for the coating of a conductor comprising melt extruding onto said conductor a blend comprised of
- (a) melt-processible fluoropolymer having a flex life of greater than about 1000 cycles, and capable of being extruded by itself at at least about 2500 ft/min (12.7 m/s) and
- (b) a pigment comprising titanium dioxide coated with one or more layers comprising oxides, or mixtures of oxides, of at least one of silicon and aluminum, said extruding being at a rate of at least about 2000 ft/min (10 m/s) to give a conductor with a coating having no more than about 10 lumps/135,000 ft (41,000 m) or no more than about 10 sparks/135,000 ft (41,000 m).
A composition capable of being melt-extruded onto a conductor at a rate of at least about 2000 ft/min (10 m/s) comprised of (a) melt-processible fluoropolymer having a flex life greater than about 1000 cycles, and capable of being extruded by itself at at least about 2500 ft/min (12.7 m/s) and (b) pigment comprising titanium dioxide coated with one or more layers comprising oxides, or mixtures of oxides, of at least one of silicon and aluminum.
Dependencies are inferred from the claim text.