Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR PRODUCING POLYTETRAFLUOROETHYLENE AQUEOUS DISPERSION
Document Type and Number:
WIPO Patent Application WO/2021/085470
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method which is for producing a polytetrafluoroethylene aqueous dispersion, and by which the amount of a fluorine-based oligomer produced as a by-product is reduced and the CFT of a film to be formed is great.　A method for producing a polytetrafluoroethylene aqueous dispersion includes: step A1 for polymerizing a non-fluorine-based monomer in an aqueous medium to obtain a solution 1 containing a polymer containing a unit based on a non-fluorine-based monomer; step A2 for polymerizing tetrafluoroethylene in the solution 1 without substantially adding a surfactant to the solution 1 to obtain an aqueous emulsion containing polytetrafluoroethylene particles, and step A3 for adding a nonionic surfactant to the aqueous emulsion and then concentrating the aqueous emulsion to obtain a polytetrafluoroethylene aqueous dispersion, wherein the amount of the non-fluorine-based monomer used is at most 200 mass ppm with respect to the amount of tetrafluoroethylene supplied to a polymerization system.

More Like This:
JP6608845Non-aqueous soundproof material containing non-powdered polyacrylate binder and radically polymerizable compound
JP3946979METHACRYLIC RESIN COMPOSITION EXCELLENT IN LOW TEMPERATURE PROCESSING CHARACTERISTIC AND SCRATCH RESISTANCE
Inventors:
HIGUCHI SHINYA (JP)
TAKAZAWA MASAHIRO (JP)
LAI YINGWEI (JP)
EBATA SHIRO (JP)
KOSE TAKEHIRO (JP)
Application Number:
PCT/JP2020/040421
Publication Date:
May 06, 2021
Filing Date:
October 28, 2020
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AGC INC (JP)
International Classes:
C08F265/06; C08F2/22; C08F2/44; C08F283/06; C08L51/00; C08L51/08
Domestic Patent References:
WO2019065640A12019-04-04
Foreign References:
JP2007511657A2007-05-10
JP2005501956A2005-01-20
JP2009029723A2009-02-12
JP2013542309A2013-11-21
JP2016537499A2016-12-01
US6841616B22005-01-11
US7977438B22011-07-12
JP2019196139A2019-11-14
Other References:
"Fluoropolymer Handbook", NIKKAN KOGYO SHIMBUN, LTD.
See also references of EP 4053181A4
Attorney, Agent or Firm:
T.S. PARTNERS et al. (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: PLANT PROCESSING METHOD AND PLANT PROCESSING SYSTEM

Next Patent: SURGERY-ASSISTING DEVICE