Claims
- 1. A process for producing unsaturation in elastomeric copolymers comprising from 55 to 87% by moles of vinylidene fluoride, from 13 to 45% by moles of hexafluoropropene and/or chlorotrifluoroethylene, and from 0 to 27% by moles of tetrafluoroethylene, characterized in that a solution of said copolymer in a substantially water-insoluble polar solvent is treated with an aqueous solution of an inorganic base, in the presence of a phase-transfer catalyst; the concentration of the copolymer in its solution being between 1 and 30% by weight; the volume ratio water/copolymer solution ranging from 10/1 to 1/10; the phase-transfer catalyst being an ammonium quaternary compound having the formula NR.sub.1 R.sub.2 R.sub.3 R.sub.4 X or a phosphonium quaternary compound having the formula PR.sub.1 R.sub.2 R.sub.3 R.sub.4 X, wherein X is an inorganic or organic anion and R.sub.1, R.sub.2, R.sub.3 and R.sub.4, equal to or different from each other, are alkyl, aryl or alkylaryl radicals, the total amount of carbon atoms in the radicals R.sub.1 +R.sub. 2 +R.sub.3 +R.sub.4 ranging from 15 to 40.
- 2. The process according to claim 1, characterized in that the copolymer solution is treated with the aqueous solution at a temperature ranging from 0.degree. to 100.degree. C.
- 3. The process according to claim 1, characterized in that the copolymer solution is treated with the aqueous solution at a temperature ranging from 5.degree. to 85.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
19789 A/85 |
Mar 1985 |
ITX |
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Parent Case Info
This application is a continuation-in-part of our copending application Ser. No. 836,125, filed Mar. 4, 1986, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3252954 |
Calfee et al. |
May 1966 |
|
3560595 |
Phillips et al. |
Feb 1971 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1152208 |
May 1969 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
836125 |
Mar 1986 |
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