Claims
- 1. A fluorine-containing copolymer comprisingethylene, tetrafluoroethylene, a fluorovinyl compound of the formula: CH2═CFRf (1) wherein Rf is a fluoroalkyl group having 2 to 10 carbon atoms, andhexafluoropropylene, in which a molar ratio of tetrafluoroethylene to ethylene is from 40:60 to 90:10, the content of the above fluorovinyl compound of the formula: CH2═CFRf is from 0.1 to 10 mole % based on the whole copolymer, and the content of hexafluoropropylene is from 0.1 to 30 mole % based on the whole copolymer.
- 2. A fluorine-containing copolymer according to claim 1, wherein the content of hexafluoropropylene is from 0.1 to 20 mole % of the whole copolymer.
- 3. A fluorine-containing copolymer according to claim 1, wherein the molar ratio of tetrafluoroethylene to ethylene is from 50:50 to 70:30, the content of said fluorovinyl compound is from 0.1 to 6 mole % of the whole copolymer, and the content of hexafluoropropylene is from 0.1 to 20 mole % of the whole copolymer.
- 4. A fluorine-containing copolymer according to claim 1, wherein the content of hexafluoropropylene is from 0.1 to 10 mole % of the whole copolymer.
- 5. A fluorine-containing copolymer according to claim 1, wherein said fluorovinyl compound is a compound of the formula:CH2═CF(CF2)nH wherein n is an integer of 3 to 5.
- 6. A weather-resistant protective film comprising a fluorine-containing copolymer as claimed in claim 1.
- 7. A film for an agricultural housing comprising a fluorine-containing copolymer as claimed in claim 1.
- 8. A film for construction comprising a fluorine-containing copolymer as claimed in claim 1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-237726 |
Sep 1966 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP97/03097 which has an International filing date of Sep. 4, 1997 which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP97/03097 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/10000 |
3/12/1998 |
WO |
A |
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4513129 |
Nakagawa et al. |
Apr 1985 |
A |
4677175 |
Ihara |
Jun 1987 |
A |
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JP |
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JP |
57-38807 |
Mar 1982 |
JP |
60-94411 |
May 1985 |
JP |
60-248710 |
Dec 1985 |
JP |