US 11,807,702 B2
Fluororesin, fluororesin particles, and methods for producing these
Shohei Yumino, Yokkaichi (JP); Tomoya Shimono, Yokkaichi (JP); Kota Sakaguchi, Yokkaichi (JP); Tomonari Nagai, Yokkaichi (JP); Kazunari Iwanaga, Yokkaichi (JP); Masao Tanabiki, Yokkaichi (JP); and Toru Doi, Yokkaichi (JP)
Assigned to TOSOH CORPORATION, Shunan (JP)
Appl. No. 17/280,624
Filed by TOSOH CORPORATION, Shunan (JP)
PCT Filed Sep. 27, 2019, PCT No. PCT/JP2019/038144
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/067421, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-183594 (JP), filed on Sep. 28, 2018; application No. 2019-027318 (JP), filed on Feb. 19, 2019; application No. 2019-037005 (JP), filed on Feb. 28, 2019; and application No. 2019-171553 (JP), filed on Sep. 20, 2019.
Prior Publication US 2022/0041767 A1, Feb. 10, 2022
Int. Cl. C08F 24/00 (2006.01)
CPC C08F 24/00 (2013.01) 6 Claims
OG exemplary drawing
 
1. A method for producing resin particles, the method comprising:
obtaining a resin comprising a residue unit of formula (4) by placing a mixture of a radical polymerization initiator, a monomer of formula (3) and an organic solvent under a polymerization condition, wherein
the organic solvent is a solvent in which at least the monomer is dissolved, at least a part of the resin produced by polymerization is not dissolved, and precipitation of the resin occurs, and the organic solvent comprises a fluorine atom and a hydrogen atom in a molecule;
and
the resin produced by the polymerization precipitates as particles in the organic solvent,

OG Complex Work Unit Chemistry
wherein Rf5, Rf6, Rf7, and Rf8 are each independently selected from the group consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the linear or branched perfluoroalkyl group may have an ethereal oxygen atom, Rf5, Rf6, Rf7, and Rf8 may be linked to one another to form a ring having 4-8 carbon atoms, and the ring optionally includes an ethereal oxygen atom.