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US 5,710,205 AGranted
Composition of fluoropolymers
AssigneeImperial Chemical Industries PLC
InventorsMark Davies, Paul Martin Hatton
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Abstract
A wear-resistant solid fluoropolymer composition, e.g. of homo- and copolymers of tetrafluoroethylene (TFE), which has an extremely low coefficient of friction in dry sliding contact with metal, without the application of additional fluid lubricant, which composition comprises: a) a fluoropolymer, b) a poly(arylene sulphide) and c) another high aromatic polymer; and a process for preparing the foregoing solid fluoropolymer composition.
Claims10
A solid fluoropolymer composition which comprises:
- a) polytetrafluoroethylene (PTFE),
- b) a poly(arylene sulphide) and
- c) another aromatic polymer, at least 50 wt. % of which is made up of aromatic moieties linked by functional groups such as oxy, carbonyl, sulphonyl, sulphonyloxy, amino, imino and mixtures thereof
- and wherein the PTFE is present as a sintered matrix and wherein a mixture of at least the PTFE and the poly(arylene sulphide) have been subjected to a heat treatment within the temperature range from 200.degree. C. to 400.degree. C. prior to sintering and wherein the PTFE provides at least 30 vol. % of the composition, the poly(arylene sulphide) provides up to 40 vol. % of the composition and the aromatic polymer provides up to 30 vol. % of the composition;
- and wherein the volume ratio of the poly(arylene sulphide) to the aromatic polymer is in the range of from 5:1 to 1:2.
2 more elements
Dependencies are inferred from the claim text.