Title:
A manufacturing method of polytetrafluoroethylene molding powder, and a manufacturing method of polytetrafluoroethylene Granulated material
Document Type and Number:
Japanese Patent JP6256355
Kind Code:
B2
Abstract:
To provide a process for producing a PTFE molding powder having a high bulk density from granular polymer particles without using an emulsifying agent having problems of bioaccumulation and toxicity. A process for producing a polytetrafluoroethylene molding powder, which comprises a step of suspension-polymerizing a monomer containing at least 99.8 mass% of tetrafluoroethylene in an aqueous medium to produce granular polymer particles and a step of milling the granular polymer particles, wherein the aqueous medium contains a compound represented by R F (OCF(X 1 )CF 2 ) k-1 OCF(X 2 )COO - M + , at a concentration of from 0.5 to 2,000 ppm. R F is a perfluorinated C 1-10 monovalent organic group, X 1 and X 2 are fluorine atoms, etc., and M + is an ammonium ion or the like.
Inventors:
Shinya Higuchi
Takahiro Masahiro
Hiroki Nagai
Takahiro Masahiro
Hiroki Nagai
Application Number:
JP2014560750A
Publication Date:
January 10, 2018
Filing Date:
January 31, 2014
Export Citation:
Assignee:
Asahi Glass Co., Ltd.
International Classes:
C08J3/12; C08F2/18; C08F14/26; C08K5/09; C08L27/18
Domestic Patent References:
| JP2002317003A | ||||
| JP2006509072A | ||||
| JP60188408A | ||||
| JP49014590A |
Foreign References:
| WO2008032613A1 | ||||
| WO2003035724A1 | ||||
| WO2009128432A1 |
Attorney, Agent or Firm:
Sumio Tanai
Masatake Shiga
Suzuki Mitsuyoshi
Noriko Yanai
Masatake Shiga
Suzuki Mitsuyoshi
Noriko Yanai