Claims
- 1. A perfluoropolyether prepared by photooxidation of tetrafluoroethylene and perfluoro-butadiene comprising the following formula: ##STR32## which do not contain peroxidic oxygen wherein: R.sub.f and R'.sub.f are --CF.sub.2 COF or --CF.sub.3 end groups at least one being --CF.sub.2 COF, or groups R.sub.f, R'.sub.f are --CF.sub.2 COOR, or --CF.sub.2 Br m, n and p are integers different from zero, the m/n ratio is within the range of from 0.5 to 2, the oxyfluoroalkylene units being randomly distributed along the chain; and the (m+n)/p ratio ranging from 3 to 40.
- 2. The perfluoropolyether according to claim 1, formula (I), having wherein an average molecular weight within the range of from 500 to 15,000.
- 3. A perfluoropolyether prepared by photooxidation of tetrafluoroethylene and perfluoro-butadiene comprising the formula: ##STR33## which does not contain peroxidic oxygen wherein: R.sub.f and R'.sub.f are both --CF.sub.2 COF, m, n and p are integers different from zero, the m/n ratio being within the range of from 0.5 to 2, the oxyfluoroalkylene units being randomly distributed along the chain; and the (m+n)/p ratio ranging from 3 to 40.
Priority Claims (1)
Number |
Date |
Country |
Kind |
20346 A/86 |
May 1986 |
ITX |
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Parent Case Info
This application is a continuation of application Ser. No. 287,168, filed Dec. 21, 1988, now abandoned, which is a division of application Ser. No. 045,541 filed May 4, 1987, now U.S. Pat. No. 4,853,097.
US Referenced Citations (11)
Foreign Referenced Citations (3)
Number |
Date |
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089820 |
Sep 1983 |
EPX |
165649 |
Dec 1985 |
EPX |
193122 |
Sep 1986 |
EPX |
Divisions (1)
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Number |
Date |
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Parent |
45541 |
May 1987 |
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Continuations (1)
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Number |
Date |
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Parent |
287168 |
Dec 1988 |
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