Curable compositions

Claim 3

A method in accordance with claim 1 wherein (A) is a hydroxy-functional organopolysiloxane.

Claim 4

A method in accordance with claim 2 wherein (A) is of the formula ##EQU34## in which R 4 is a monovalent hydrocarbon radical selected from the group consisting of alkyl radicals of from 1 to 6 inclusive carbon atoms and the phenyl radical; R 5 is an alkyl radical of from 1 to 6 inclusive carbon atoms; a is an integer having a value of 1 or 2; b having a value of 0 or 1, the sum ofa + b being no more than 2; c is an integer having a value of 1 or 2, d is an integer having a value of from 1 to 3; e having a value of 0 to 2, the sum of d + 3 being no more than 3; x having a value of at least 1 and y having a value of 0 or more.

Claim 5

A method in accordance with claim 3 wherein the organopolysiloxane has from 1.0 to 1.7 R 4 substituents per silicon atom and contains at least 2 weight percent silanol groups.

Claim 6

A method in accordance with claim 2 wherein (B) is a polyepoxide.

Claim 7

A method in accordance with claim 5 wherein the polyepoxide (B) is a cycloaliphatic polyepoxide.

Claim 8

A method in accordance with claim 5 wherein the polyepoxide (B) is obtained by the reaction of polyhydric phenols with polyfunctional halohydrins.

Claim 9

A method in accordance with claim 7 wherein the polyepoxide (B) is obtained by the reaction of polyhydric phenols with epichlorohydrin.

Claim 10

A method in accordance with claim 1 wherein the aluminum compound is of the formula Al(OR).sub.3

Claim 11

a method in accordance with claim 1 wherein the aluminum compound is of the formula ##EQU35##

Claim 12

A method in accordance with claim 1 wherein the aluminum compound is an aluminum chelate.

Claim 13

A method in accordance with claim 1 wherein the aluminum compound is an aluminosiloxy compound of the formula .tbd.ALOSiR.sub.3.sup.2

Claim 14

A method in accordance with claim 1 wherein the aluminum catalyst is present in an amount in the range of from 0.05 to 5 weight percent based on the total weight of (A) + (B).

Claim 15

A substantially anhydrous composition comprising A. an organosilicon compound containing at least one silicon-bonded hydroxyl group; B. a compound containing at least one epoxy group; C. a catalytic amount of an aluminum compound selected from the group consisting of a. Al(OR) 3 in which R is either a hydrogen atom or selected from the group consisting of alkyl radicals containing from 1 to 20 inclusive carbon atoms or aryl and aryl-containing hydrocarbon radicals containing from 6 to 24 inclusive carbon atoms; ##EQU36## in which R is as previously defined, R' is selected from the group consisting of the hydrogen atom, alkyl radicals containing from 1 to 30 inclusive carbon atoms and aryl or aryl-containing radicals of at least 6 carbon atoms, n having a value of from 0 to 2 and condensates of such compounds; c. aluminum salts of the formula H.sup.+ Al.sup.-(OR).sub.4 in which R is as previously defined; d. aluminosiloxy compounds of the formula =ALOSiR.sub.3.sup.2 in which R 2 is selected from the group consisting of --OR radicals in which R is as defined, ##EQU37## radicals in which R' is as defined, monovalent hydrocarbon or halohydrocarbon radicals containing from 1 to 30 inclusive carbon atoms, and siloxane moieties of the formula ##EQU38## in which R 3 is selected from the group consisting of OR radicals in which R is as defined, ##EQU39## radicals in which R' is as defind and monovalent hydrocarbon or halohydrocarbon radicals containing from 1 to 30 inclusive carbon atoms, and a has a value of from 1 to 3; the remaining aluminum valences being satisfied by --OAl=, --OR, ##EQU40## or --OSIR 3 2 bonding, R, R' and R 2 being as previously defined; and e. aluminum chelates formed by reacting compounds (a), (b) or (c) with-sequestering agents in which the coordinating atom is oxygen, said organosilicon compond (A) being pesent in an amount sufficient to provide at least 0.1 .tbd.SiOH group per epoxy group present in (B).

Claim 16

A substantially anhydrous composition comprising A. an organosilicon compound containing at least one silicon-bonded hydroxyl group; B. a compound containing at least one epoxy group; C. a catalytic amount of an aluminum compound selected from the group consisting of a. Al(OR) 3 in which R is either a hydrogen atom or selected from the group consisting of alkyl radicals containing from 1 to 20 inclusive carbon atoms or aryl and aryl-containing hydrocarbon radicals containing from 6 to 24 inclusive carbon atoms; ##EQU36## in which R is as previously defined, R' is selected from the group consisting of the hydrogen atom, alkyl radicals containing from 1 to 30 inclusive carbon atoms and aryl or aryl-containing radicals of at least 6 carbon atoms, n having a value of from 0 to 2 and condensates of such compounds; c. aluminum salts of the formula H.sup.+ Al.sup.-(OR).sub.4 in which R is as previously defined; d. aluminosiloxy compounds of the formula =ALOSiR.sub.3.sup.2 in which R 2 is selected from the group consisting of --OR radicals in which R is as defined, ##EQU37## radicals in which R' is as defined, monovalent hydrocarbon or halohydrocarbon radicals containing from 1 to 30 inclusive carbon atoms, and siloxane moieties of the formula ##EQU38## in which R 3 is selected from the group consisting of OR radicals in which R is as defined, ##EQU39## radicals in which R' is as defind and monovalent hydrocarbon or halohydrocarbon radicals containing from 1 to 30 inclusive carbon atoms, and a has a value of from 1 to 3; the remaining aluminum valences being satisfied by --OAl=, --OR, ##EQU40## or --OSIR 3 2 bonding, R, R' and R 2 being as previously defined; and e. aluminum chelates formed by reacting compounds (a), (b) or (c) with-sequestering agents in which the coordinating atom is oxygen, said organosilicon compond (A) being pesent in an amount sufficient to provide at least 0.1 .tbd.SiOH group per epoxy group present in (B).

Claim 17

A composition in accordance with claim 14 wherein compound (B) is a polyepoxide.

Claim 18

A composition in accordance with claim 15 wherein component (A) is a hydroxy-functional organopolysiloxane of the formula ##EQU41## in which R 4 is a monovalent hydrocarbon radical selected from the group consisting of alkyl radicals of from 1 to 6 inclusive carbon atoms and the phenyl radical; R 5 is an alkyl radical of from 1 to 6 inclusive carbon atoms; a is an integer having a value of 1 or 2; b having a value of 0 or 1, the sum of a + b being no more than 2; c is an integer having a value of 1 or 2, d is an integer having a value of from 1 to 3; e having a value of 0 to 2, the sum of d + e being no more than 3; x having a value of at least 1 and y having a value of 0 or more.

Claim 19

A composition in accordance with claim 16 wherein the organopolysiloxane (A) is present in an amount sufficient to provide from 0.5 to 1.5 .tbd.SiOH per epoxy group present in (B).

Claim 20

A composition in accordance with claim 16 wherein said organopolysiloxane is a phenylpolysiloxane resin having a degree of substitution of from 1.0 to 1.7; a phenyl to silicon ratio of 0.2 to 1.5 and a silicon-bonded hydroxyl content of from 2.5 to 10 weight percent.

Claim 21

A composition in accordance with claim 18 wherein the polyepoxide (b) is selected from the group consisting of the glycidyl ethers of polyphenols and cycloaliphatic polyepoxides.

Claim 22

A composition in accordance with claim 19 wherein the phenylpolysiloxane resin is of the formula ##EQU42## in which R is an alkyl of from 1 to 3 inclusive carbon atoms, a has an average value of from 1.0 to 1.7, the phenyl to silicon ratio being in the range of 0.2 to 1.5, the silicon-bonded hydroxyl content of said resin being in the range of 2.5 to 7.5 weight percent.

Claim 23

A composition in accordance with claim 19 containing a solid filler.

Claim 24

A composition in accordance with claim 21 wherein the filler is present in an amount in the range of 30 to 90 weight percent based on the total weight of the composition.

Claim 25

A composition in accordance with claim 22 wherein the filler includes granular fused silica and glass fibers.

Claim 26

A composition in accordance with claim 20 wherein the aluminum catalyst (C) is an aluminum acylate of the formula ##EQU43##

Claim 27

A composition in accordance with claim 24 comprising A. from 10 to 60 weight percent of the polysiloxane resin B. from 49 to 90 weight percent of the polyepoxide C. from 0.1 to 5 weight percent, based on the combined weight of (A) and (B) of aluminum acylate catalyst.

Claim 28

A composition in accordance with claim 25 wherein the polyepoxide is an epoxy functional cresol novalac resin.

Claim 29

A composition in accordance with claim 25 wherein the polyepoxide is the diglycidyl ether of bis-phenol A.

Claim 30

A composition in accordance with claim 25 wherein the polyepoxide is a cycloaliphatic polyepoxide having an epoxide equivalent of more than 65.

Claim 31

A composition in accordance with claim 25 wherein the aluminum acylate (C) is selected from the group consisting of aluminum stearates and aluminum benzoates.

Claim 32

A cured composition in accordance with claim 15.

Claim 33

A composition in accordance with claim 14 wherein the aluminum compound is of the formula Al(OR).sub.3

Claim 34

A composition in accordance with claim 14 in which the aluminum compound is of the formula ##EQU44##

Claim 35

A composition in accordance with claim 14 wherein the aluminum compound is of the formula H.sup.+ Al.sup.-(OR).sub.4

Claim 36

A composition in accordance with claim 14 wherein the aluminum compound is of the formula .tbd.AlOSiR.sub.3.sup.2

Claim 37

a composition in accordance with claim 14 wherein the aluminum compound is an aluminum chelate.

Claim 38

A composition in accordance with claim 14 wherein at least a portion of the epoxide comprise a brominated epoxy compound.