US 11,866,579 B2
Curable fluoropolyether-based rubber composition and optical component
Hidenori Koshikawa, Annaka (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/293,421
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Oct. 24, 2019, PCT No. PCT/JP2019/041600
§ 371(c)(1), (2) Date May 12, 2021,
PCT Pub. No. WO2020/100544, PCT Pub. Date May 22, 2020.
Claims priority of application No. 2018-213679 (JP), filed on Nov. 14, 2018.
Prior Publication US 2021/0403709 A1, Dec. 30, 2021
Int. Cl. C08L 71/00 (2006.01); G02B 1/04 (2006.01)
CPC C08L 71/00 (2013.01) [C08L 2201/10 (2013.01); G02B 1/04 (2013.01)] 6 Claims
 
1. A curable fluoropolyether-based rubber composition comprising:
(A) a linear polyfluoro compound containing at least two alkenyl groups per molecule and having a perfluoropolyether structure in its main chain,
(B) a fluorine-containing organohydrogensiloxane having a monovalent perfluoroalkyl or monovalent perfluorooxyalkyl group or a divalent perfluoroalkylene or divalent perfluorooxyalkylene group and containing at least two silicon-bonded hydrogen atoms (or SiH groups), per molecule, in an amount to give 0.2 to 3 moles of SiH groups in component (B) per mole of alkenyl groups in component (A),
(C) sodium fluoride in an amount of 0.10 to 100 parts by weight per 100 parts by weight of component (A), and
(D) a platinum group metal-based catalyst in an amount to give 0.1 to 2,000 ppm of platinum group metal atom based on the weight of component (A).