Patent ID: 6265494
Filing Date: 2001-07-24
Classification: C08K,C08L

Abstract:
Curable fluoroelastomeric compositions comprising:A) 100 phr of fluoroelastomeric copolymers based on vinylidenefluoride (VDF) copolymers and at least a partially or completely fluorinated comonomer having an ethylene unsaturation;B) 0.5 to 10 phr of a curing agent having the general formula(R.sub.3 --Si)--P.sub.q --O--).sub.2 Q,whereinq is 0 or 1,R is selected from the group consisting of:C.sub.x M.sub.2x+1 linear or branched aliphatic chain containing hydrogen and/or fluorine (M=H and/or F);a C.sub.x M.sub.2x-1 cycloaliphatic structure containing hydrogen and/or fluorine;a C.sub.x M.sub.x-1 aromatic structure containing hydrogen or fluorine;x in said formulas is an integer from 1 to 20; andP.sub.a wherein P is a bivalent (per)fluoropolyether linking group and a is an integer from 0 to 1;Q is selected from the group consisting of an aromatic or an aliphatic structure;an aromatic structure containing nitrogen or oxygen; anda structure having the following formula:--S.sub.1 --C(S.sub.2)--C(S.sub.3)--Z--C(S.sub.4)--C(S.sub.5)--S.sub.6 --whereinS.sub.1, S.sub.2, S.sub.3, S.sub.4, S.sub.5 and S.sub.6 are equal to or different from each other, and are H or C.sub.1 -C.sub.5 alkyls;Z is a C.sub.1 -C.sub.18 alkylene or cycloalkylene radical, linear or branched, optionally containing oxygen and/or fluorine atoms, or a bivalent (per)fluoropolyoxyalkylene radical P; andC) an accelerant comprising an onium-organic compound having a positive charge.