US 12,264,238 B2
Fluorinated copolymer composition, crosslinked rubber and method for its production
Yukiko Hattori, Tokyo (JP); Tsuyoshi Kawai, Tokyo (JP); Takeshi Yamada, Tokyo (JP); and Takehiro Kose, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Aug. 25, 2021, as Appl. No. 17/411,227.
Application 17/411,227 is a continuation of application No. PCT/JP2020/009647, filed on Mar. 6, 2020.
Claims priority of application No. 2019-042729 (JP), filed on Mar. 8, 2019; application No. 2019-171600 (JP), filed on Sep. 20, 2019; and application No. 2019-192748 (JP), filed on Oct. 23, 2019.
Prior Publication US 2021/0380794 A1, Dec. 9, 2021
Int. Cl. C08L 27/18 (2006.01); C08F 214/26 (2006.01); C08J 3/24 (2006.01); C08L 21/02 (2006.01)
CPC C08L 27/18 (2013.01) [C08F 214/262 (2013.01); C08J 3/246 (2013.01); C08L 21/02 (2013.01); C08J 2321/02 (2013.01); C08J 2327/18 (2013.01)] 12 Claims
 
1. A fluorinated copolymer composition, comprising:
a crosslinking agent;
a crosslinking co-agent; and
a fluorinated copolymer having units based on tetrafluoroethylene, units based on a perfluoro (alkyl vinyl ether), and units based on formula (2), (CR1R2═CR3)aR4 where each of R1, R2 and R3 independently is a hydrogen atom, a fluorine atom or a methyl group, a represents an integer of from 2 to 6, and R4 is an a-valent C1-10 perfluorohydrocarbon group or a group having an etheric oxygen atom at a terminal or between carbon-carbon atoms of the perfluorohydrocarbon group,
wherein in the fluorinated copolymer, a content of the units based on tetrafluoroethylene is from 69 to 90 mol % based on a total number of moles of units of the fluorinated copolymer, a content of the crosslinking agent is from 0.03 to 0.7 part by mass to 100 parts by mass of the fluorinated copolymer, a content of the crosslinking co-agent is from 0.1 to 2.5 parts by mass to 100 parts by mass of the fluorinated copolymer, and a content of the units based on the formula (2) is from 0.03 to 0.5 mol % based on a total number of moles of units of the fluorinated copolymer.