Title:
ポリテトラフルオロエチレン水性分散液組成物の製造方法
Document Type and Number:
Japanese Patent JP4207442
Kind Code:
B2
Abstract:
To an aqueous PTFE polymer emulsion having a PTFE content of from 10 to 50 mass% obtained by emulsion polymerization of tetrafluoroethylene in the presence of an anionic perfluorocarboxylate surfactant (APFC), from 2 to 20 mass%, based on the mass of PTFE, of a nonionic surfactant having an average molecular weight of from 450 to 800 and an inorganic/organic property ratio of from 1.07 to 1.50 and from 10 to 800 mass%, based on the mass of PTFE, of water are added to obtain an aqueous PTFE dispersion having a PTFE content of from 1 to 40 mass% of PTFE, and then PTFE is concentrated by sedimenting the PTFE and separating a PTFE-rich aqueous dispersion composition from the supernatant. According to the present invention, a PTFE-rich aqueous dispersion composition having a low APFC concentration can be obtained.
Inventors:
Jun Hoshikawa
Shigeki Kobayashi
Shigeki Kobayashi
Application Number:
JP2002078785A
Publication Date:
January 14, 2009
Filing Date:
March 20, 2002
Export Citation:
Assignee:
Asahi Glass Co., Ltd.
International Classes:
C08F6/16; C08F6/20; C08F14/00; C08F14/26
Foreign References:
| WO1999055746A1 | ||||
| WO2000035971A1 | ||||
| WO2001079332A1 |
Attorney, Agent or Firm:
Shinobu Orikuchi