PatentFIZZ™

1. An anhydrous curable organosilicate coating composition comprising an organosilicate having a plurality of atmospheric moisture hydrolyzable alkoxy group-to-silicon bonds and about 1% to about 50% by weight of said organosilicate of a 1,3-oxazolidine curing agent having the formula: ##STR4## wherein R.sup.1 is selected from the group consisting of hydrogen, branched, straight chain and cyclic monovalent alkyl, and aryl groups having 1-20 carbon atoms,

R.sup.2 and R.sup.3 are the same or different and are selected from the group consisting of hydrogen, branched, straight chain and cyclic alkyl and aryl groups having 1-10 carbon atoms each, and R.sup.2 and R.sup.3 may be linked together to form a monocyclic or polycyclic ring structure having 3-20 carbon atoms including the 1,3-oxazolidine carbon atom to which R.sup.2 and R.sup.3 are bonded, and

R.sup.4 is hydrogen or an alkyl group having 1-4 carbon atoms;

said composition curing in the presence of atmospheric moisture.

2. The composition according to claim 1 wherein said organosilicate is an alkoxy-substituted polysiloxane having the unit formula: ##EQU2## wherein R.sup.5 is a monovalent organic radical, R.sup.6 is one or a mixture of C.sub.1 -C.sub.8 alkyl groups, n has an average value of about 0.5 to about 1.9, m has an average value of at least 0.1 to about 2.5, the sum of m plus n being 0.51 to 3, and there being an average of at least 1.2 R.sup.6 groups present per alkoxy-substituted polysiloxane.

3. The composition according to claim 1 wherein R.sup.1 is selected from the group consisting of branched and straight chain monovalent alkyl groups having 1-6 carbon atoms; and R.sup.2 and R.sup.3 are the same or different and are selected from the group consisting of hydrogen, branched and straight chain monovalent alkyl groups each having 1-4 carbon atoms.

4. An anhydrous curable polysiloxane coating composition comprising a polysiloxane having a unit formula: ##EQU3## wherein R.sup.5 is a monovalent saturated organic radical, R.sup.6 is one or more of a mixture of C.sub.1 -C.sub.8 alkyl groups, n has an average value of about 0.5 to about 1.9, m has an average value of at least 0.1 to about 2.5, the sum of m plus n being 0.51 to 3, and there being an average of at least 1.2 R.sup.6 groups present per alkoxy-substituted polysiloxane; and a curing agent present at about 10% to about 20% by weight of said polysiloxane, said curing agent having the formula: ##STR5## wherein R.sup.1 is selected from the group consisting of branched and straight chain monovalent alkyl groups having 1-6 carbon atoms, and

R.sup.2 and R.sup.3 are the same or different and are selected from the group consisting of hydrogen, branched and straight chain alkyl groups each having 1-4 carbons;

said composition curing in the presence of atmospheric moisture.

5. The composition according to claim 4 wherein R.sup.6 is one or more of C.sub.1 -C.sub.4 alkyl groups, the average number of R.sup.6 groups per molecule is 2-8, and m has a value of from about 0.5 to about 1.1.

6. The composition according to claim 1 wherein said organosilicate is a polysiloxane having the formula: ##STR6## wherein R.sup.7 is selected from the group consisting of 2-ethoxyethyl, ethyl and mixtures thereof; and x is a number from 2-10.

7. The composition according to claim 1 additionally comprising non-reactive solvent.

8. A anhydrous curable polysiloxane coating composition comprising a non-reactive solvent having dispersed or dissolved therein a polysiloxane having the formula: ##STR7## wherein R.sup.7 is selected from the group consisting of 2-ethoxyethyl, ethyl and mixtures thereof, and x is a number from 2-8; and about 10% to about 20% by weight based upon said polysiloxane of a 1,3-oxazolidine curing agent having the formula: ##STR8## wherein R.sup.1 is selected from the group consisting of branched and straight chain monovalent alkyl groups having 1-6 carbon atoms; and

R.sup.2 and R.sup.3 are the same or different, and are selected from the group consisting of hydrogen, branched and straight chain monovalent alkyl groups wherein the sum of the carbon atoms in both R.sup.2 and R.sup.3 groups is less than or equal to 4;

said composition curing in the presence of atmospheric moisture.

9. The composition according to claim 8 additionally comprising a non-reactive solvent, said composition being anhydrous and stored in a container preventing ingress of atmospheric moisture.

10. A method of curing the organosilicate coating composition of claim 1 which comprises exposing said composition to an atmosphere containing moisture.