Phosphosilicone/silicate copolymers and their use as corrosion inhibitors and silicate stabilizers in antifreezes

Claim 2

An organosilane/silicate copolymer obtained by reacting an organic phosphosilicon compound of the formula I ##STR7## where Y is a divalent aliphatic or cycloaliphatic radical of 1 to 10 carbon atoms or a phenylenealkylene group of 7 to 10 carbon atoms and n can be 1 or 2, and when n is 1, X is an OR 3 group in which R 3 is a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms or is acyl of not more than 9 carbon atoms, and R 1 and R 2 are identical or different and are each a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms, or is an aryl or aralkyl group of not more than 20 carbon atoms, and when n is 2, X is oxygen and R 1 is an alkali metal and R 2 has the above meanings, with a silicate of the formula ##STR8## where M is an alkali metal and q is from 0.4 to 4, in a weight ratio of from 1:1 to 1:10 at from 30° to 150° C.

Claim 3

An organosilane/silicate copolymer obtained by reacting a compound of the formula I as claimed in claim 1, where Y is a straight-chain or branched alkylene group of 1 to 6 carbon atoms and, when n is 1, R 1 , R 2 and R 3 are each alkyl of 1 to 4 carbon atoms, and, when n is 2, R 1 is sodium or potassium, with one of the stated silicates of the formula II.

Claim 4

A radiator antifreeze based on glycol, containing from 500 to 5000 ppm, based on the said antifreeze, of an organosilane/silicate copolymer which is obtained by reacting an organic phosphosilicon compound of the formula I ##STR9## where Y is a divalent aliphatic or cycloaliphatic radical of 1 to 10 carbon atoms or a phenylenealkylene group of 7 to 10 carbon atoms and n can be 1 or 2, and when n is 1, X is an OR 3 group in which R 3 is a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms or is acyl of not more than 9 carbon atoms, and R 1 and R 2 are identical or different and are each a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms, or is an aryl or aralkyl group of not more than 20 carbon atoms, and when n is 2, X is oxygen and R 1 is an alkali metal and R 2 has the above meanings, with a silicate of the formula ##STR10## where M is an alkali metal and q is from 0.4 to 4, in a weight ratio of from 1:1 to 1:10.

Claim 5

A radiator antifreeze based on glycol, containing from 500 to 5000 ppm, based on the said antifreeze, of an organosilane/silicate copolymer which is obtained by reacting an organic phosphosilicon compound of the formula I ##STR9## where Y is a divalent aliphatic or cycloaliphatic radical of 1 to 10 carbon atoms or a phenylenealkylene group of 7 to 10 carbon atoms and n can be 1 or 2, and when n is 1, X is an OR 3 group in which R 3 is a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms or is acyl of not more than 9 carbon atoms, and R 1 and R 2 are identical or different and are each a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms, or is an aryl or aralkyl group of not more than 20 carbon atoms, and when n is 2, X is oxygen and R 1 is an alkali metal and R 2 has the above meanings, with a silicate of the formula ##STR10## where M is an alkali metal and q is from 0.4 to 4, in a weight ratio of from 1:1 to 1:10.

Claim 6

A radiator antifreeze based on glycol, containing an organosilane/silicate copolymer which is obtained by reacting a compound of the formula I as claimed in claim 3, where Y is a straight-chain or branched alkylene group of 1 to 6 carbon atoms and, when n is 1, R 1 , R 2 and R 3 are each alkyl of 1 to 4 carbon atoms, and when n is 2, R 1 is sodium or potassium, with one of the stated silicates of the formula II.

Claim 7

A radiator antifreeze as claimed in claim 3, wherein the organosilane/silicate copolymer is obtained by reacting an organic phosphosilicon compound of the formula I with a silicate of the formula II in situ in the radiator antifreeze.

Claim 8

A radiator antifreeze as claimed in claim 3, wherein the organosilane/silicate copolymer is obtained by reacting an organic phosphosilicon compound of the formula I with a silicate of the formula II in a separate stage.

Claim 9

Method of inhibiting corrosion of aluminum by an aqueous cooling medium containing a radiator antifreeze based on glycol during the cooling of an internal combustion engine, wherein from 500 to 5000 ppm, based on the said antifreeze, of an organosilane/silicate copolymer which is obtained by reacting an organic phosphosilicon compound of the formula I ##STR11## where Y is a divalent aliphatic or cycloaliphatic radical of 1 to 10 carbon atoms or a phenylenealkylene group of 7 to 10 carbon atoms and n can be 1 or 2, and when n is 1, X is an OR 3 group in which R 3 is a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms or is acyl of not more than 9 carbon atoms, and R 1 and R 2 are identical or different and are each a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms, or is an aryl or aralkyl group of not more than 20 carbon atoms, and when n is 2, X is oxygen and R 1 is an alkali metal and R 2 has the above meanings, with a silicate of the formula II ##STR12## where M is an alkali metal and q is from 0.4 to 4, in a weight ratio of from 1:1 to 1:10, is added to the aqueous cooling medium.

Claim 10

Method of inhibiting corrosion of aluminum by an aqueous cooling medium containing a radiator antifreeze based on glycol during the cooling of an internal combustion engine, wherein from 500 to 5000 ppm, based on the said antifreeze, of an organosilane/silicate copolymer which is obtained by reacting an organic phosphosilicon compound of the formula I ##STR11## where Y is a divalent aliphatic or cycloaliphatic radical of 1 to 10 carbon atoms or a phenylenealkylene group of 7 to 10 carbon atoms and n can be 1 or 2, and when n is 1, X is an OR 3 group in which R 3 is a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms or is acyl of not more than 9 carbon atoms, and R 1 and R 2 are identical or different and are each a straight-chain, branched or cyclic alkyl group of 1 to 13 carbon atoms which may be interrupted by oxygen atoms, or is an aryl or aralkyl group of not more than 20 carbon atoms, and when n is 2, X is oxygen and R 1 is an alkali metal and R 2 has the above meanings, with a silicate of the formula II ##STR12## where M is an alkali metal and q is from 0.4 to 4, in a weight ratio of from 1:1 to 1:10, is added to the aqueous cooling medium.

Claim 11

A method as claimed in claim 7, wherein an organosilane/silicate copolymer which is obtained by reacting a compound of the formula I, where Y is a straight-chain or branched alkylene group of 1 to 6 carbon atoms, and when n is 1, R 1 , R 2 and R 3 are each alkyl of 1 to 4 carbon atoms and, when n is 2, R 1 is sodium or potassium, with one of the stated silicates of the formula II, is added to the cooling medium.

Claim 12

A method as claimed in claim 7, wherein the organosilane/silicate copolymer added is obtained by reacting an organic phosphosilicon compound of the formula I with a silicate of the formula II in situ in the radiator antifreeze.

Claim 13

A method as claimed in claim 7, wherein the organosilane/silicate copolymer used is obtained by reacting an organic phosphosilicon compound of the formula I with a silicate of the formula II in a separate stage.