Process for the producing perfluorovinyl ethersulfonic acid derivatives and copolymer of the same
AssigneeDaikin Industries, Ltd.
InventorMasayoshi Tatemoto
Life of this patent
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Abstract
A compound of the formula (1): FSO2CFXCF2O(CFXCF2O)nCF—(CF2Y)COF in which X is a fluorine atom, a chlorine atom or a trifluoromethyl 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, preferably 0, 1 or 2, is converted to a compound of the formula (2): MOSO2CFXCF2O(CFXCF2O)2CF(CF2Y)COOM1 in which X, Y and n are the same as defined above, and M and M1 independently represent an alkali metal atom or an alkaline earth metal atom, and then a compound of the formula (2) is pyrolyzed at a temperature of 150 to 250° C. to obtain a compound of the formula (3): ASO2CFXCF2O(CFXCF2O)nCF═CF2 in which A is MO—, a hydroxyl group or a fluorine atom, and X and n are the same as defined above.
Claims7
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, and
- pyrolizing 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.
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.
Dependencies are inferred from the claim text.