Curable fluoroelastomeric compositions

Details Curable fluoroelastomeric compositions Curable fluoroelastomeric compositions

C - Chemistry, Metallurgy

08

F

C08F 214/18 (2006.01) C08K 5/00 (2006.01) C08K 5/136 (2006.01) C08K 5/19 (2006.01) C08K 5/37 (2006.01) C08K 5/50 (2006.01) C08K 5/5399 (2006.01)

Patent

CA 2150343

Curable flurooelastomeric compositions employable for prepa- ring fuel hoses or O-rings for injectors comprising: A) 100 phr (parts) copolymers or terpolymers based on VDF with a content in fluorine of at least 67% by weig- ht, the VDF being comprised from 30 to 50% by weig- ht, from 20 to 60% by weight of HFP optionally other monomeric units deriving from a monomer having ethylene unsaturation; the sum of the comonomers being 100; B) 1 to 5 phr of an adduct between an accelerator and a curing agent in molar ratio from 1:2 to 1:5, the acce- lerator being an onio-organic compound having a positi- ve charge, the curing agent being a di- or polyhydroxy or di- or polythiol compound; the adduct being obtained by melting of the reaction product between accelerator and curing agent in the indicated molar ratios, or by melting of the adduct mixture 1:1 added with the curing agent in the indicated amounts.

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