US 11,859,075 B2
Core-shell type particle, dispersion and powder
Katsuhide Ohtani, Osaka (JP); Masamichi Sukegawa, Osaka (JP); Kazuhiro Yamamura, Osaka (JP); Shoichi Arima, Echizen (JP); Takeshi Fukuzumi, Echizen (JP); and Yuji Gama, Echizen (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP); and NISSIN CHEMICAL INDUSTRY CO., LTD, Echizen (JP)
Appl. No. 16/771,497
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP); and NISSIN CHEMICAL INDUSTRY CO., LTD, Echizen (JP)
PCT Filed Dec. 13, 2018, PCT No. PCT/JP2018/045899
§ 371(c)(1), (2) Date Jun. 10, 2020,
PCT Pub. No. WO2019/124215, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. 2017-244349 (JP), filed on Dec. 20, 2017.
Prior Publication US 2021/0070974 A1, Mar. 11, 2021
Int. Cl. C08F 259/08 (2006.01); C08L 27/18 (2006.01)
CPC C08L 27/18 (2013.01) [C08F 259/08 (2013.01); C08L 2201/50 (2013.01); C08L 2207/53 (2013.01)] 5 Claims
 
1. A method for producing a core-shell particle, comprising adding a non-fluorine monomer to a perfluoropolymer dispersion and polymerizing the non-fluorine monomer to produce the core-shell particle,
the polymerization being initiated by simultaneously adding the non-fluorine monomer and a polymerization initiator to the perfluoropolymer dispersion,
wherein the core-shell particle comprises a core containing the perfluoropolymer and a shell containing a non-fluorine resin, the core having a periphery coated with the non-fluorine resin at a coverage of 90% or more,
the perfluoropolymer is a polymer containing a polymerized unit based on a perfluoro monomer in an amount of 90 mol % or more relative to all polymerized units,
the shell has a mass of 20 or less and the core has a mass of 80 or more relative to a total mass of the core and the shell of 100,
the core has an average particle size of 50 nm or more, and
the shell has a thickness of 1 to 300 nm.