Production of stable hydrolyzable organosilane solutions
First Claim
1. A method of improving the storage stability and broadening the pH stability of an aqueous solution containing from about 0.001% to 5% by weight of a water soluble organosilane of the formula
provided that the organosilane forms a clear solution in water at 25°
C. at the intended level of use, which method comprises including within the solutiona. from about 0.05% to 10% by weight of the total aqueous solution of a water soluble organic quaternary ammonium compound which is free of silicon atoms and contains at least one nitrogen-bonded hydrocarbon group of at least 8 carbons andb. from about 0.5% to 30% by weight of the total aqueous solution of at least one surfactant selected from the group consisting of nonionic, amphoteric, sarcosine anionic, and cationic surfactants other than the compounds of (a);
wherein the amounts of (a) and (b) present are effective to improve the storage stability of and to broaden the pH stability of the resulting solution and eachA is --OH or a hydrolyzable group,B is an alkyl group of from 1 to 4 carbon atoms,x has a value of 0, 1 or 2, andD is a hydrocarbon group of from 1 to 4 carbon atoms, phenyl, or a nonionic or cationic, substituted-hydrocarbon group containing at least one oxygen or nitrogen group or salts of such substituted-hydrocarbon groups.
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Abstract
A method of improving the stability and broadening the range of pH stability of an aqueous solution of from about 0.001% to 5% by weight of a water soluble organosilane containing hydrolyzable groups such as methyltrimethoxysilane, 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride and 3-(trimethoxysilyl)propylmethyldi(decyl) ammonium chloride by the use of 0.05% to 10% by weight of a water soluble organic quaternary ammonium compound having at least one nitrogen-bonded hydrocarbon group of at least 8 carbon atoms and being free of silicon atoms, such as benzalkonium chloride, along with from about 0.5% to 30% by weight of at least one surfactant selected from the group consisting of nonionic, amphoteric sarcosine anionic, and cationic surfactants other than the water soluble quaternary ammonium compounds. The pH of the solution can be adjusted to from about 1 to about 13.5 with a suitable acid or base. The resulting stable aqueous solutions are useful for depositing the water soluble organosilane on a variety of substrates to, among other things, serve as coupling agents, waterproofing agents and to render substrates antimicrobial and algicidal depending upon the nature of the organosilane.
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52 Claims
- 1. A method of improving the storage stability and broadening the pH stability of an aqueous solution containing from about 0.001% to 5% by weight of a water soluble organosilane of the formula
- space="preserve" listing-type="equation">A.sub.3-x B.sub.x SiD
provided that the organosilane forms a clear solution in water at 25°
C. at the intended level of use, which method comprises including within the solutiona. from about 0.05% to 10% by weight of the total aqueous solution of a water soluble organic quaternary ammonium compound which is free of silicon atoms and contains at least one nitrogen-bonded hydrocarbon group of at least 8 carbons and b. from about 0.5% to 30% by weight of the total aqueous solution of at least one surfactant selected from the group consisting of nonionic, amphoteric, sarcosine anionic, and cationic surfactants other than the compounds of (a); wherein the amounts of (a) and (b) present are effective to improve the storage stability of and to broaden the pH stability of the resulting solution and each A is --OH or a hydrolyzable group, B is an alkyl group of from 1 to 4 carbon atoms, x has a value of 0, 1 or 2, and D is a hydrocarbon group of from 1 to 4 carbon atoms, phenyl, or a nonionic or cationic, substituted-hydrocarbon group containing at least one oxygen or nitrogen group or salts of such substituted-hydrocarbon groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- 14. A method of improving the storage stability and broadening the pH stability of an aqueous solution containing from about 0.001% to 5% by weight of a water soluble organosizane of the formula
- space="preserve" listing-type="equation">A.sub.3-x B.sub.x SiD
provided that the organosizane forms a clear solution in water at 25°
C. at the intended level of use, which method comprisesI. including within the solution a. from about 0.05% to 10% by weight of the total aqueous solution of a water soluble organic quaternary ammonium compound which is free of silicon atoms and contains at least one nitrogen-bonded hydrocarbon group of at least 8 carbons and b. from about 0.5% to 30% by weight of the total aqueous solution of at least one surfactant selected from the group consisting of nonionic, amphoteric, sarcosine anionic, and cationic surfactants other than the compounds of (a);
wherein the amounts of (a) and (b) present are effective to improve the storage stability of and to broaden the pH stability of the resulting solution; andII. including within the solution a sufficient amount of an acid or a base to obtain a solution pH of from about 1 to about 13.5, wherein each A is --OH or a hydrolyzable group, B is an alkyl group of from 1 to 4 carbon atoms, x has a value of 0, 1 or 2, and D is a hydrocarbon group of from 1 to 4 carbon atoms, phenyl, or a nonionic or cationic, substituted-hydrocarbon group containing at least one oxygen or nitrogen group or salts of such substituted-hydrocarbon groups. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
Specification