Water repellents containing organosilicon compounds
AssigneeDow Corning Corporation
InventorsHoward M. Bank, Dipak Narula, Lori A. Stark
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Abstract
A composition which is an aqueous solution including (i) an alkyltrialkoxysilane with C.sub.1 to C.sub.6 alkyl groups on silicon; (ii) a silane coupling agent, (iii) an amino resin, and (iv) a quaternary ammonium silane. The composition is used to render surfaces water repellent.
Claims30
A composition comprising the product obtained by combining water, (i) an alkyltrialkoxysilane selected from the group consisting of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon and blends of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon, (ii) a water soluble silane coupling agent or hydrolysis product thereof, (iii) an amino resin, and (iv) a quaternary ammonium silane having a formula selected from the group consisting of:
- ##STR4## wherein in each formula (I)-(IV):
- Y is RO where R is alkyl radical of one to four carbon atoms;
- a has a value of zero, one or two;
- R' is a methyl or ethyl radical;
- R" is an alkylene group of one to four carbon atoms;
- R'", R"" and R.sup.V are each independently selected from the group consisting of alkyl radicals of one to eighteen carbon atoms, --CH.sub.2 C.sub.6 H.sub.5, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 OH, and --(CH.sub.2).sub.x NHC(O)R.sup.vi wherein x has a value of from two to ten and R.sup.vi is a perfluoroalkyl radical having from one to twelve carbon atoms;
- X is chloride, bromide, fluoride, iodide, acetate or tosylate;
- and
- Z is a positively charged aromatic pyridinium ring of the formula C.sub.5 H.sub.6 N.sup.+ --.
A composition comprising the product obtained by combining water, (i) an alkyltrialkoxysilane selected from the group consisting of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon and blends of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon, (ii) an amino resin, and (iii) a quaternary ammonium silane having a formula selected from the group consisting of:
- ##STR7## wherein in each formula (I)-(IV):
- Y is RO where R is an alkyl radical of one to four carbon atoms;
- a has a value of zero, one or two;
- R' is a methyl or ethyl radical;
- R" is an alkylene group of one to four carbon atoms;
- R'", R"" and R.sup.v are each independently selected from the group consisting of alkyl radicals of one to eighteen carbon atoms, --CH.sub.2 C.sub.6 H.sub.5, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 OH, and --(CH.sub.2).sub.x NHC(O)R.sup.vi wherein x has a value of from two to ten and R.sup.vi is a perfluoroalkyl radical having from one to twelve carbon atoms;
- X is chloride, bromide, fluoride, iodide, acetate or tosylate;
- and
- Z is a positively charged aromatic pyridinium ring of the formula C.sub.5 H.sub.6 N.sup.+ --.
A method of treating a surface in order to render the surface water repellent comprising applying to the surface to be treated in aqueous solution formed by combining water, (i) an alkyltrialkoxysilane selected from the group consisting of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon and blends of alkyltrialkoxysilanes with C.sub.1 to C.sub.6 alkyl groups on silicon, (ii) an amino resin, and (iii) a quaternary ammonium silane having a formula selected from the group consisting of:
- ##STR10## wherein in each formula (I)-(IV):
- Y is RO where R is an alkyl radical of one to four carbon atoms;
- a has a value of zero, one or two;
- R' is a methyl or ethyl radical;
- R" is an alkylene group of one to four carbon atoms;
- R'", R"" and R.sup.v are each independently selected from the group consisting of alkyl radicals of one to eighteen carbon atoms, --CH.sub.2 C.sub.6 H.sub.5, --CH.sub.2 CH.sub.2 OH, --CH.sub.2 OH, and --(CH.sub.2).sub.x NHC(O)R.sup.vi wherein x has a value of from two to ten and R.sup.vi is a perfluoroalkyl radical having from one to twelve carbon atoms;
- X is chloride, bromide, fluoride, iodide, acetate or tosylate;
- and
- Z is a positively charged aromatic pyridinium ring of the formula C.sub.5 H.sub.6 N.sup.+ --.
Dependencies are inferred from the claim text.