Heat stabilized silicone elastomers

Claim 1

A fuser member for use in an electrostatographic reproducing machine comprising a rigid base and a thin deformable layer of a composition coated thereon comprising the crosslinked product of a mixture of about; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR14## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxyl or vinyl groups, < (m/n)≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand of the formula ##STR15## where each R 1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms, R' 1 is an X' substituted R 1 , each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ) 2 , --A s (R 2 ) 2 , or --S(R 2 ) where each R 2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or an aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ) 2 , --A s (R 2 ) 2 , or --S(R 2 ), X is --N(R 2 )--, p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane said complex being predispersed in a polyorganosiloxane oil or blend of polyorganosiloxane oils of the formula: ##STR16## where R' is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A' and D' may be any of methyl, hydroxy or vinyl groups, R', A' and D' being selected to minimize reaction with R, A or D in the formula in "a" to minimize the formation of a crosslinked product therebetween, 0<(m'/n')≦1 and 8<m'+n'<2000, said oil or blend of oils having a viscosity within the range from about 50 centistokes to 100,000 centistokes and being present in an amount of from about 5 to 100 parts per 100 parts of "a", (c) from about 5 to about 500 parts by weight of finely divided fillers, and (d) a further crosslinking agent and a crosslinking catalyst, said crosslinking agent and catalyst being present in an amount sufficient to promote crosslinking of said at least one polyorganosiloxane.