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US 5,962,553 AGranted
Organoclay-polymer composites
AssigneeRaychem Corporation
InventorMark W. Ellsworth
Life of this patent
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Abstract
Nanocomposites are made by melt-blending a melt processable polymer having a high melt processing temperature and an organophosphonium cation modified layered clay. Such modified layered clay is more stable at the higher temperatures encountered during the melt processing of such a melt processable polymer than the modified layered clays used in the prior art, enabling the preparation of the nanocomposite.
Claims5
A method of making a composite, comprising the steps of:
- (a) providing 100 parts by weight of melt processable polymer which is a fluoroplastic selected from the group consisting of ethylene-tetrafluoroethylene copolymer, perfluorinated ethylene-propylene copolymer, and tetrafluoroethylene-perfluoro(propyl vinyl ether) copolymer;
- (b) providing between 1 and 80 parts by weight of a modified layered clay, the modified layered clay being a layered clay having negatively charged layers and modified so as to have organophosphonium cations intercalated between the negatively charged layers, the organophosphonium cations having the structure
- R.sub.1 P.sup.+ (R.sub.2).sub.3
- wherein R.sub.1 is a C.sub.8 to C.sub.24 alkyl or arylalkyl group and each R.sub.2, which may be the same or different, is an aryl, arylalkyl, or a C.sub.1 to C.sub.6 alkyl group;
- and
- (c) melt-blending together the melt processable polymer and the modified layered clay to form the composite.
3 more elements
Dependencies are inferred from the claim text.