Method for producing fluorinated copolymer latex, fluorinated copolymer latex, binder for producing electrode, electrode mixture for storage battery device, and electrode for storage battery device
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United States of America Patent
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Jul 25, 2017
Grant Date -
Sep 15, 2016
app pub date -
May 20, 2016
filing date -
Feb 18, 2011
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Abstract
To produce a method for producing a fluorinated copolymer latex with a low content of metal components and with favorable stability of the latex even with a low content of an organic solvent. A method for producing a fluorinated copolymer latex, which comprises emulsion-polymerizing a monomer mixture containing tetrafluoroethylene and propylene in the presence of an aqueous medium, an anionic emulsifying agent and a thermally decomposable radical polymerization initiator at a polymerization temperature within a range of from 50° C. to 100° C., wherein the aqueous medium comprises water alone, or water and a water-soluble organic solvent, and the content of the water-soluble organic solvent is less than 1 part by mass per 100 parts by mass of water; and the amount of use of the anionic emulsifying agent is from 1.5 to 5.0 parts by mass per 100 parts by mass of the fluorinated copolymer to be formed.
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