Process for producing fluoropolymer
AssigneeDaikin Industries, Ltd.
InventorsToshio Sogabe, Tatsuya Morikawa, Yoshiyuki Tanaka, Masanori Kitaichi, Mitsuru Kishine
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Abstract
In the emulsion obtained by forcedly emulsifying by applying a high shearing force on the water insoluble liquid in the presence of a small amount of emulsifying agent, at least one of fluorine-containing monomers being in the form of gas at ordinary temperature at atmospheric pressure is emulsion-polymerized stably and efficiently. An amount of the emulsifying agent is an amount which does not change the number of water insoluble liquid particles in the emulsion during the polymerization.
Claims10
A process for preparing a fluorine-containing polymer, which comprises a step for preparing an emulsion in which particles comprising a substance being substantially insoluble in water being in the form of liquid at 20° at 1 atm, and comprising a polymerizable monomer or a mixture of a polymerizable monomer and chain transfer agent are dispersed and a step for polymerizing at least one fluorine-containing ethylenic unsaturated monomer and said polymerizable monomer in the emulsion;
- wherein, a weight of said substance is ¼ or more based on a weight of an aqueous medium in the emulsion, a volume average particle size of said particles in the emulsion which are substantially insoluble in water is 80 to 250 nm prior to polymerizing and said at least one fluorine-containing ethylenic unsaturated monomer is in the form of gas at 20° at 1 atm.
Dependencies are inferred from the claim text.