Claims
- 1. A process for preparing a vinyl ethersulfonic acid derivative comprising the steps of:converting a compound of formula (1): FSO2CFXCF2O(CFXCF2O)nCF(CF2Y)COF (1) wherein X is a fluorine atom, a chlorine atom or a trifluorometyl group, Y is a fluorine atom, a chlorine atom a bromine atom or an iodine atom, and n is a number of 0 to 5, to a compound of formula (2):MOSO2CFXCF2O(CFXCF2O)nCF(CF2Y)COOM1 (2) wherein X, Y and n are the same as defined above, and M and M1 independently represent an alkali metal or an alkaline earth metal atom, andpyrolizing a compound of the formula (2) at a temperature of 150 to 250° C. to obtain a compound of formula (3): MOSO2CFXCF2O(CFXCF2O)nCF═CF2 (3) wherein X, M and n are the same as defined above.
- 2. A process according to claim 1, wherein n is 0, 1 or 2.
- 3. A process according to claim 1, wherein said pyrolysis is carried out in the presence of an inert solvent.
- 4. A process according to claim 1, wherein a vinyl ethersulfonic acid derivative of the formula (4):ASO2CF2CF2OCF═CF2 (4) wherein A is a group: —OM in which M is an alkali metal or an alkaline earth metal atom, a hydroxyl group or a fluorine atom using a compound of the formula (I) in which X is a fluorine atom, n is 0 and Y is a fluorine atom, as a starting compound.
- 5. A process for preparing a block polymer comprising the steps of:copolymerizing a vinyl ethersulfonic acid derivative of the formula (3): ASO2CFXCF2O(CFXCF2O)nCF═CF2 (3) wherein X is a fluorine atom, A is a group —OM in which M is an alkali metal or an alkaline earth metal atom, a hydroxyl group or a fluorine atom with at least one monomer selected from the group consisting of fluoroolefins and olefins in the presence of a polymerization initiator and perfluoroalkylene diiodide to obtain a copolymer, and copolymerizing at least one monomer selected from the group consisting of fluoroolefins and olefins in the presence of the copolymer obtained in the previous step.
- 6. A block copolymer which is prepared by a process as claimed in claim 5 and has a molecular weight of 5×103 to 3×106.
- 7. A process according to claim 1, wherein the compound of formula 1 is converted to the compound of formula (2) by using an aqueous or alcoholic solution of hydroxide of an alkaline earth metal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-080274 |
Mar 1997 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP98/01472 which has an International filing date of Mar. 31, 1998, which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP98/01472 |
|
WO |
00 |
9/30/1999 |
9/30/1999 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/43952 |
10/8/1998 |
WO |
A |
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4804727 |
Ezzell et al. |
Feb 1989 |
|
5981673 |
DeSimone et al. |
Nov 1999 |
|
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Date |
Country |
57-85367 |
May 1982 |
JP |
58-500567 |
Apr 1983 |
JP |
63-310988 |
Dec 1988 |
JP |
5221880 |
May 1993 |
JP |