Agc Inc.

Wakako Hashimoto

Susumu Saito

Tetsuji Shimohira

Kazuo Hamazaki

Satoshi Otsugu

Hiroki Matoba

To provide a monomer composition in which the solubility of the polymerization inhibitor in the cyclic monomer is good, the stability of the cyclic monomer during storage is good, and the cyclic monomer and the polymerization inhibitor are easily separated by distillation; and a method for producing a high molecular weight fluorinated polymer from the monomer composition. A monomer composition which comprises a specific cyclic monomer and a polymerization inhibitor, wherein the polymerization inhibitor is a polymerization inhibitor which satisfies (a) it is a 6-membered unsaturated cyclic hydrocarbon having from 1 to 4 substituents, (b) it has, as the substituent, at least one type selected from the group consisting of a t-butyl group, a methyl group, an isopropenyl group, an oxo group and a hydroxy group, (c) in a case where it has an oxo group as one type of the substituent, it has, as the substituent other than the oxo group, either one or both of a t-butyl group and a methyl group, and (d) in a case where it has a hydroxy group as the substituent, the number of the hydroxy group is only one.

Monomer composition and method for producing fluorinated polymer

To provide a process for producing a fluorinated polymer having a cyclic structure at a relatively low cost, by efficiently recovering, from a mixture containing a fluorinated polymer obtained by polymerizing a perfluoromonomer having a cyclic structure and an unreacted perfluoromonomer having a cyclic structure, the unreacted perfluoromonomer having a cyclic structure. A monomer component containing a perfluoromonomer having a specific cyclic structure is polymerized in the presence of a polymerization initiator at a predetermined polymerization temperature to obtain a mixture containing a fluorinated polymer and an unreacted cyclic structure monomer, and the perfluoromonomer having a cyclic structure is recovered from the mixture at a temperature of at most the maximum ultimate temperature of the polymerization temperature+12&#xb0; C. and at most the 10 hour half-life temperature of the polymerization initiator+12&#xb0; C. under a pressure of less than the atmospheric pressure.

Process for producing fluorinated polymer

A method for producing particles of a fluorinated polymer (A) which has either one or both of structural units (u1) derived from tetrafluoroethylene and structural units (u2) having no sulfonic acid type functional group and having a cyclic structure and fluorine atoms, and which has structural units (u3) having a sulfonic acid type functional group, wherein the proportion of the structural units (u1) is from 0 to 82 mol % in all structural units in the fluorinated polymer (A), the method including:

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Chiyoda-ku, Japan

Wakako Hashimoto