Fluoropolymer production method

Patent metadata

Field	Value
Publication number	US-9834631-B2
Application number	US-201414892844-A
Country	US
Kind code	B2
Filing date	Apr 30, 2014
Priority date	May 27, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present invention aims to provide a method of producing a fluoropolymer, especially a fluoropolymer essentially including a tetrafluoroethylene or chlorotrifluoroethylene unit, at a higher polymerization rate with improved efficiency, the method being capable of improving the moldability in extrusion molding and suppressing discoloration. The method of producing a fluoropolymer of the present invention includes producing a fluoropolymer by polymerizing tetrafluoroethylene or chlorotrifluoroethylene in the presence of a peroxydicarbonate. The peroxydicarbonate is represented by the formula:

R—O—C(═O)—O—O—C(═O)—O—R

wherein R's may be the same as or different from each other and individually represent a C4 alkyl group or alkoxy alkyl group.

First claim

The invention claimed is:

1. A method of producing a fluoropolymer, comprising producing a fluoropolymer by polymerizing only the following monomers:
(i) tetrafluoroethylene or chlorotrifluoroethylene and
(ii) at least one monomer selected from the group consisting of: ethylene; chlorotrifluoroethylene; vinyl fluoride; hexafluoropropylene; hexafluoroisobutene; monomers represented by CH 2 ═CX 1 (CF 2 ) n X 2 , wherein X 1 is H or F, X 2 is H, F, or Cl, and n is an integer of 1 to 10; perfluoro(alkyl vinyl ethers) represented by CF 2 ═CF—ORf 1 , wherein Rf 1 is a C1-C10 perfluoroalkyl group or a C1-C17 perfluoroalkoxy alkyl group; and alkyl perfluorovinyl ether derivatives represented by CF 2 ═CF—OCH 2 —Rf 2 , wherein Rf 2 is a C1-C5 perfluoroalkyl group, in the presence of a peroxydicarbonate,
the peroxydicarbonate being represented by the following formula:
R—O—C(═O)—O—O—C(═O)—O—R

wherein R's may be the same as or different from each other and individually represent a C4 alkyl group or alkoxy alkyl group,
wherein the fluoropolymer is a fluororesin which has a melting point of 160° C. to 320° C., and
wherein the peroxydicarbonate is di-sec-butyl peroxydicarbonate or di-2-ethoxyethyl peroxydicarbonate.

2. The method of producing a fluoropolymer according to claim 1 ,
wherein the tetrafluoroethylene is polymerized with ethylene.

3. The method of producing a fluoropolymer according to claim 1 ,
wherein the tetrafluoroethylene is polymerized with a perfluoro(alkyl vinyl ether) represented by CF 2 ═CF—ORf 1 wherein Rf 1 is a C1-C10 perfluoroalkyl group or a C1-C17 perfluoroalkoxy alkyl group.

4. The method of producing a fluoropolymer according to claim 1 ,
wherein the tetrafluoroethylene is polymerized with hexafluoropropylene.

5. The method of producing a fluoropolymer according to claim 1 ,
wherein the chlorotrifluoroethylene is polymerized.

6. The method of producing a fluoropolymer according to claim 1 ,
wherein the polymerization is performed by emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization.

Assignees

• Daikin Ind Ltd

Inventors

• Sekiguchi Takashi
• Fujisawa Manabu
• Fukagawa Ryouichi
• Shimono Takeshi

Classifications

• C08F214/265

  with non-fluorinated comonomers · CPC title

• C08F214/262

  with fluorinated vinyl ethers · CPC title

• C08F214/242

  with fluorinated vinyl ethers · CPC title

• C08F214/245

  with non-fluorinated comonomers · CPC title

• C08F214/24

  Trifluorochloroethene · CPC title