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A silicone composition curable to a heat stabilized silicone elastomer comprising at least one polyorganosiloxane having the formula: [Figure] 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

A silicone composition curable to a heat stabilized silicone elastomer comprising at least one polyorganosiloxane having the formula: [Figure] 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, 0350, a complex comprising a transition metal salt of at least one polydentate chelating ligand having the formula: [Figure] where each R1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms R1, is an X′substituted R1, each of Z and E may be any of carboxy thiocarboxy, dithiocarboxy, or －N(R2)2, －As(R2)2, －S(R2) where each R2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or any aryl radical having less than 19 carbon atoms, X′may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, －N(R2)2, －As(R2)2, or －S(R2), X is －N(R2)－, －As(R2)－, or －S－and p is 0 to 4 present in the composition in an amount sufficient to inhibit oxidative degradation of the polyorganosiloxane and a finely divided filler and effective amounts of crosslinking agent and catalyst. The complex may be predispersed in a polyorganosiloxane oil having a viscosity within a range of to 50 to 100,000 centistokes. In a preferred embodiment for use in an electrostatographic reproducing machine a fuser member is made with an addition curable polyorganosiloxane and the complex is bis(ethylene diamine) copper (II) sulfate initially redispersed in a low viscosity silicone oil and subsequently dispersed in a higher viscosity silicone oil.

대표청구항 ▼

A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula “a”: [Figure] where R is h

A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula “a”: [Figure] 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, 0m/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 [Figure] where each R1 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 R1, each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy, or －N(R2)2, －As(R2)2, －S(R2) where each R2 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(R2)2, －As(R2)2, or －S(R2), X is －N(R2)－, －As(R2)－, or －S－and p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers. The curable composition of claim 1 wherein said complex is present in an amount of from about 1 to about 20 parts by weight per 100 parts by weight of total polyorganosiloxane as designated in “a”. The curable composition of claim 9 wherein said complex is bis(ethylene diamine) copper (II) sulfate.