Claims
- 1. A composition consisting essentially of
- (a) 50-75 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR2## wherein R.sub.1 is R.sub.f, --R'.sub.f --X, or O--R.sub.f or --O--R'.sub.f --X in which R.sub.f is a perfluoroalkyl radical of 1-12 carbon atoms, R'.sub.f is --(CF.sub.2).sub.n --, where n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 70 per 10.sup.6 carbon atoms; and
- (b) graphite fibers.
- 2. A composition consisting essentially of
- (a) 50-90 weight % of a melt-processible tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene comonomer and recurring units of a comonomer represented by the formula ##STR3## wherein R.sub.1 is R.sub.f, --R'.sub.f --X, or O--R.sub.f or O--R'.sub.f --X in which R.sub.f is a perfluoroalkyl radical of 1-12 carbon atoms, R'.sub.f is --(CF.sub.2).sub.n --, where n=1-12, or the same diradical containing ether oxygen; and X is H or Cl; and wherein said copolymer has been fluorinated by subjecting it to a fluorinating agent until the number of unstable end groups is less than 70 per 10.sup.6 carbon atoms; and
- (b) a thermoconductive filler.
- 3. The composition according to claim 1 or 2 wherein the comonomer is hexafluoropropylene.
- 4. The composition of claim 1 or 2 wherein the comonomer is perfluoro(propyl vinyl ether).
- 5. The composition of claim 1 or 2 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro(alkyl vinyl ether).
- 6. The composition according to claim 1 or 2 wherein the fluorinating agent is fluorine gas.
- 7. The composition of claim 1 or 2 wherein the comonomer is a mixture of hexafluoropropylene and perfluoro (propyl vinyl ether).
- 8. The composition of claim 1 wherein the graphite fiber has an average length of at least 2 mm.
- 9. The composition of claim 1 wherein the graphite fiber has a length/diameter ratio of at least 100.
- 10. The composition of claim 1 or 2 wherein the amount of copolymer is 50-90% by weight.
- 11. The composition of claim 2 wherein the thermoconductive filler is selected from the group consisting of iron oxide, zinc oxide, aluminum oxide, magnesium oxide and silicon carbide.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 253,520 filed Oct. 7, 1988 now U.S. Pat. No. 4,902,444,which is a continuation-in-part of application Ser. No. 169,993 filed Mar. 18, 1988,now abandoned which is a continuation-in-part of application Ser. No. 149,152 filed Jan. 27, 1988 now abandoned which is a continuation-in-part of application Ser. No. 109,033 filed Oct. 16, 1987 now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0079589 |
May 1983 |
EPX |
7513957 |
May 1975 |
JPX |
1210974 |
Oct 1970 |
GBX |
Continuation in Parts (4)
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Number |
Date |
Country |
Parent |
253520 |
Oct 1988 |
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Parent |
169993 |
Mar 1988 |
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Parent |
149152 |
Jan 1988 |
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Parent |
109033 |
Oct 1987 |
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