Asahi Kasei Kabushiki Kaisha

Daikin Industries, Ltd.

Asahi Kasei E-Materials Corporation

Nobuyuki Uematsu

Masanori Ikeda

Takehiro Koga

Masahiro Kondo

Tadaharu Isaka

Tadashi Ino

Nobuto Hoshi

Yasuhiro Nagato

Kenichi Yakigaya

Akitake Nakamura

Hideki Date

Oliver Gronwald

Kaishi Hori

The present disclosure is directed to provide a process capable of producing a sulfonic acid group-containing monomer in a good yield, which can be used as a raw material of fluorine-based polymer electrolytes, such as membranes for fuel cells, catalyst binder polymers for fuel cells, and membranes for chlor-alkali electrolysis. A process for producing a sulfonic acid group-containing monomer represented by the general formula (3) includes the step of mixing and stirring a cyclic compound represented by the general formula (1) and a silanol compound represented by the general formula (2).

Process for producing sulfonic acid group-containing monomer

The present disclosure is directed to provide a vinylsulfonic anhydride which is useful as a synthetic intermediate for synthesis of a fluorinated monomer. It is also directed to efficiently produce the vinylsulfonic anhydride. It is further directed to efficiently produce a fluorinated monomer using the vinylsulfonic anhydride. A vinylsulfonic anhydride of the present disclosure is expressed by the general formula (1). Further, a process for producing a vinylsulfonic anhydride of the present disclosure includes making a vinylsulfonic acid compound represented by the general formula (2) come in contact and be mixed with an anhydridization agent. Further, a process for producing a vinylsulfonyl fluoride of the present disclosure includes a step (b) of making a vinylsulfonic anhydride represented by the general formula (1) come in contact and be mixed with a fluorinating agent to prepare a reaction mixture including a vinylsulfonyl fluoride represented by the general formula (3) and a vinylsulfonic acid compound represented by the general formula (2).

Vinylsulfonic anhydride, method for producing same, and method for producing vinylsulfonyl fluoride

The present invention provides a novel production process by which unstable terminal groups can be sufficiently stabilized under mild conditions. The present invention is related to a method for producing an &#x2014;SOH group-containing fluoropolymer wherein a fluoropolymer to be treated having a &#x2014;SOX group-containing monomer unit (X representing F or Cl) is subjected to a procedure comprising at least the steps A, B and C defined below in that order:

[object Object]

A superacidic ester group is useful in the production of ionomers for polymer electrolyte fuel cells. A polymer is produced from said vinyl monomer. A process produces a polymer containing a superacidic group. The vinyl monomer contains a haloalkyl ester group of a superacid, wherein the number of carbon atoms of the haloalkyl ester group is no more than 10, and the halogen in the haloalkyl group is chlorine and/or fluorine. A polymer containing said vinyl monomer as a repeating unit can be converted to a polymer containing a superacid group using at least one procedure of 1) heat treating at 50&#xb0;C. to 350&#xb0;C., and 2) contacting with a protic compound.

Vinyl monomer with superacid ester group and polymer of the same

There is provided a process for producing a fluorinated vinyl ether from a fluorinated acid fluoride compound having an ester group as a precursor of a carboxylic acid group, or a SOF group as a precursor of a sulfonic acid group, in high yield by simple operations. Said process is a production process comprising pyrolyzing a carboxylic acid potassium salt with a specific structure represented by the following formula in the absence of a solvent and/or while maintaining the salt in the solid state: wherein X is &#x2014;COR or &#x2014;SOF, and R is an alkyl group.

Process for producing fluorinated vinyl ether

The present invention relates to a method for producing a perfluorovinylcarboxylic acid ester by reacting a perfluorovinylcarboxylic acid salt with an alkylating agent. The present invention provides a method to produce perfluorovinylcarboxylic acid ester, which is used as a raw material of an ion-exchange membrane for the chloro alkali process, in high yield from starting material, a compound which can be easily produced, in a simple manner.

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Fuji, Japan

Nobuyuki Uematsu