US 12,435,213 B2
Production method of modified polytetrafluoroethylene and composition
Yoshinori Nanba, Osaka (JP); Kenji Ichikawa, Osaka (JP); Yohei Fujimoto, Osaka (JP); Hirotoshi Yoshida, Osaka (JP); Hiroyuki Sato, Osaka (JP); Taketo Kato, Osaka (JP); Kengo Ito, Osaka (JP); and Taku Yamanaka, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/293,591
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Nov. 19, 2019, PCT No. PCT/JP2019/045335
§ 371(c)(1), (2) Date May 13, 2021,
PCT Pub. No. WO2020/105651, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-216866 (JP), filed on Nov. 19, 2018; and application No. 2019-037848 (JP), filed on Mar. 1, 2019.
Prior Publication US 2022/0002531 A1, Jan. 6, 2022
Int. Cl. C08L 27/18 (2006.01); C08F 214/26 (2006.01); C08L 29/10 (2006.01)
CPC C08L 27/18 (2013.01) [C08F 214/262 (2013.01); C08L 29/10 (2013.01); C08F 2800/20 (2013.01); C08L 2205/14 (2013.01); C08L 2205/24 (2013.01)] 20 Claims
 
1. A method for producing modified polytetrafluoroethylene comprising:
polymerizing tetrafluoroethylene and a modifying monomer in an aqueous medium in the presence of a polymer (I) containing a polymerization unit (I) based on a monomer represented by the following general formula (I), a content of the polymerization unit (I) in the polymer (I) being 80 mol % or more based on all polymerization units, and substantially in the absence of a fluorine-containing surfactant to obtain a modified polytetrafluoroethylene:
CX1X3=CX2R(—CZ1Z2-A0)m  (I)
wherein X1 and X3 are each independently F, Cl, H, or CF3;
X2 is H, F or CF3;
A0 is an anionic group;
R is a linking group;
Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and
m is 1.