US 12,312,426 B2
Composition including curable fluoropolymer and curative and methods of making and using them
Tatsuo Fukushi, Woodbury, MN (US); Tamon Aoki, Tokyo (JP); Qilin Chan, Woodbury, MN (US); Miguel A. Guerra, Woodbury, MN (US); Klaus Hintzer, Kastl (DE); Florian D. Jochum, Ingelheim (DE); Michael H. Mitchell, Woodbury, MN (US); Allen M. Sohlo, Lindstrom, MN (US); and Yuta Suzuki, Kanagawa (JP)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/414,280
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Dec. 17, 2019, PCT No. PCT/US2019/066767
§ 371(c)(1), (2) Date Jun. 15, 2021,
PCT Pub. No. WO2020/131824, PCT Pub. Date Jun. 25, 2020.
Claims priority of provisional application 62/780,735, filed on Dec. 17, 2018.
Prior Publication US 2022/0073664 A1, Mar. 10, 2022
Int. Cl. C08F 214/26 (2006.01)
CPC C08F 214/262 (2013.01) [C08F 2800/10 (2013.01); C08F 2810/20 (2013.01)] 19 Claims
 
1. A composition comprising:
a curable fluoropolymer comprising nitrogen-containing cure sites and wherein the curable fluoropolymer comprises a partially fluorinated emulsifier and wherein the amount of partially fluorinated emulsifier is less than 500 ppb; and
a curative comprising an organo onium cation and an anion represented by Formula

OG Complex Work Unit Chemistry
wherein
each R and R′ is independently hydrogen, halogen, alkyl, aryl, arylalkylenyl, or alkylarylenyl, wherein the alkyl, aryl, arylalkylenyl, or alkylarylenyl each may be unsubstituted or each may be substituted by one or more halogens, with the proviso that R′ is not halogen, or R and R′ can join together to form a ring;
each Rf is RCF2— or a perfluoroalkyl group having up to 8 carbon atoms;
X is an organic linking group that is nonfluorinated or at least partially fluorinated; and n is 1 or 2,
wherein the composition is free of metal cations or comprises not more than 20 parts per million metal cations, and wherein the composition is free of silicon dioxide or comprises less than 0.5 percent by weight silicon dioxide, based on the total weight of the composition.