Fluoroelastomeric compositions

Details Fluoroelastomeric compositions Fluoroelastomeric compositions

C - Chemistry, Metallurgy

08

F

C08F 259/08 (2006.01) C08K 5/54 (2006.01) C08K 5/56 (2006.01) C08K 5/57 (2006.01) C08K 5/14 (2006.01)

Patent

CA 2188384

Curing systems for fluoroelastomers curable by peroxidic route which comprise bromine, optionally iodine, the bromine always being higher than iodine, comprising as essential elements: (I) a curing agent comprising a bis-olefin having general formula: (I) Image wherein: R1, R2, R3, R4, R5, R6, equal to or different from each other, are H or alkyl C1-C5; Z is a linear or branched alkylenic or cycloalkylenic radical C1-C18, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylenic radical. (II) a metallorganic hydride of formula: Image (III) wherein: M is selected from Sn, Si, Ge, Pb; x is an integer from 1 to 3; y, z are zero or integers from 1 to 3, with the proviso y + z = 4 - x; w is an integer from 1 to 3; the R groups, equal to or different from each other, are selected from: alkyls C1-C4, aryls C6-C12, arylalkyls and alkylaryls C7-C14, optionally containing nitrile and/or hydroxyl groups.

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