High heat distortion temperature epoxy siloxane/organic epoxy compositions

Claim 1

A heat curable cyclic epoxy siloxane/organic epoxy resin blend which will polymerize to form a composition having a high heat distortion temperature, the blend comprising: (A) a cyclic epoxy functional siloxane monomer having the general formula ##STR10## wherein each R group is, independently, a monovalent substituted or unsubstituted C 1-12 alkyl, C 1-12 cycloalkyl, or phenyl radical; each R 1 group is, independently, R, or a monovalent epoxy functional group having 2-10 carbon atoms with the proviso that at least one of the R 1 groups is epoxy functional; (B) an organic epoxy resin, the ratio of parts of (A) to parts (B) being from about 10:1 to about 1:1; (C) from about 2.5 to about 3.0 weight percent, based on the combined weight of (A) and (B), of a cationic onium salt catalyst having the formula: [(R.sup.2).sub.a (R.sup.3).sub.b (R.sup.4).sub.c X].sub.d +[MQ.sub.e ].sup.-(e-f), wherein R 2 is a monovalent aromatic organic radical, R 3 is a monovalent organic aliphatic radical selected from alkyl, cycloalkyl and substituted alkyl, R 4 is a polyvalent organic radical forming a heterocyclic or fused ring structure selected from aliphatic radicals and aromatic radicals, X is a Group VIa element selected from sulfur, selenium and tellurium, M is a metal or metalloid, Q is a halogen radical, a is a whole number equal to 0 to 3 inclusive, b is a whole number equal to 0 to 2 inclusive, c is a whole number equal to 0 or 1 where the sum of a+b+c is a value equal to 3 or the valence of X, d=e-f, f=valence of M and is an integer equal to from 2 to 7 inclusive, e is greater than f and is an integer having a value up to 8; and (D) from about 0.25 to about 0.30 weight percent, based on the combined weight of (A) and (B), of a copper salt cocatalyst selected from Cu(I) halide, Cu(II) benzoate, Cu(II) acetate, Cu(II) stearate, Cu(II) gluconate, Cu(II) citrate, Cu(II) formate, Cu(II) oleate, or Cu(II) carbonate.

Claim 17

A method of preparing an epoxy siloxane/organic epoxy composition having a high heat distortion temperature, comprising the step of thermally polymerizing a mixture of ingredients comprising: (A) a cyclic epoxy functional siloxane monomer having the general formula ##STR13## wherein each R group is, independently, a monovalent substituted or unsubstituted C 1-12 alkyl, C 1-12 cycloalkyl, or phenyl radical; each R 1 group is, independently, R, or a monovalent epoxy functional group having 2-10 carbon atoms with the proviso that at least one of the R 1 groups is epoxy functional; (B) an organic epoxy resin, the ratio of parts of (A) to parts of (B) being from about 10:1 to about 1:1; (C) from about 2.5 to about 3.0 weight percent, based on the combined weight of (A) and (B), of a cationic onium salt catalyst having the formula: [(R.sup.2).sub.a (R.sup.3).sub.b (R.sup.4).sub.c X].sub.d +[MQ.sub.e ].sup.-(e-f), wherein R 2 is a monovalent aromatic organic radical, R 3 is a monovalent organic aliphatic radical selected from alkyl, cycloalkyl and substituted alkyl, R 4 is a polyvalent organic radical forming a heterocyclic or fused ring structure selected from aliphatic radicals and aromatic radicals, X is a Group VIa element selected from sulfur, selenium and tellurium, M is a metal or metalloid, Q is a halogen radical, a is a whole number equal to 0 to 3 inclusive, b is a whole number equal to 0 to 2 inclusive, c is a whole number equal to 0 to 1 where the sum of a+b+c is a value equal to 3 or the valence of X, d=e-f, f=valence of M and is an integer equal to from 2 to 7 inclusive, e is greater than f and is an integer having a value up to 8; and (D) from about 0.25 to about 0.30 weight percent, based on the combined weight of (A) and (B), of a copper salt cocatalyst selected from Cu(I) halide, Cu(II) benzoate, Cu(II) acetate, Cu(II) stearate, Cu(II) gluconate, Cu(II) citrate, Cu(II) formate, Cu(II) oleate, or Cu(II) carbonate.

Claim 18

A method of preparing an epoxy siloxane/organic epoxy composition having a high heat distortion temperature, comprising the step of thermally polymerizing a mixture of ingredients comprising: (A) a cyclic epoxy functional siloxane monomer having the general formula ##STR13## wherein each R group is, independently, a monovalent substituted or unsubstituted C 1-12 alkyl, C 1-12 cycloalkyl, or phenyl radical; each R 1 group is, independently, R, or a monovalent epoxy functional group having 2-10 carbon atoms with the proviso that at least one of the R 1 groups is epoxy functional; (B) an organic epoxy resin, the ratio of parts of (A) to parts of (B) being from about 10:1 to about 1:1; (C) from about 2.5 to about 3.0 weight percent, based on the combined weight of (A) and (B), of a cationic onium salt catalyst having the formula: [(R.sup.2).sub.a (R.sup.3).sub.b (R.sup.4).sub.c X].sub.d +[MQ.sub.e ].sup.-(e-f), wherein R 2 is a monovalent aromatic organic radical, R 3 is a monovalent organic aliphatic radical selected from alkyl, cycloalkyl and substituted alkyl, R 4 is a polyvalent organic radical forming a heterocyclic or fused ring structure selected from aliphatic radicals and aromatic radicals, X is a Group VIa element selected from sulfur, selenium and tellurium, M is a metal or metalloid, Q is a halogen radical, a is a whole number equal to 0 to 3 inclusive, b is a whole number equal to 0 to 2 inclusive, c is a whole number equal to 0 to 1 where the sum of a+b+c is a value equal to 3 or the valence of X, d=e-f, f=valence of M and is an integer equal to from 2 to 7 inclusive, e is greater than f and is an integer having a value up to 8; and (D) from about 0.25 to about 0.30 weight percent, based on the combined weight of (A) and (B), of a copper salt cocatalyst selected from Cu(I) halide, Cu(II) benzoate, Cu(II) acetate, Cu(II) stearate, Cu(II) gluconate, Cu(II) citrate, Cu(II) formate, Cu(II) oleate, or Cu(II) carbonate.