US 4,374,879 A · Glass bottle coating composition made from a salt of a polyamine terminated polyepoxide adduct, an epoxy crosslinker, a reactive silane, a surfactant and a natural or synthetic wax

Abstract

The present invention is directed to a thermosetting coating composition for improving the scratch resistance, blush resistance, and lubricity of glass surfaces (e.g., glass bottles), and in certain instances also improving the label adhesion of coatings derived therefrom which comprises as functional ingredients a polyamine terminated polyepoxide adduct salt, an epoxy crosslinker, a reactive silane, a surfactant, and a natural or synthetic wax. The coating composition is carried in a vehicle which comprises water and a suitable co-solvent. The combination of the adduct salt and co-solvent permits the microemulsification of the epoxy crosslinker. The wax is also present in the emulsified state.

A multi composition which when the components are mixed forms a thermosetting curable composition capable of rendering glass surfaces scratch resistant, blush resistant and lubricious when applied as a coating on said glass surfaces which comprises:

(A) as a first component, the solution of:
(1) an acid salt of a polyamine terminated polyepoxide adduct which is the reaction product of
(a) a polyepoxide resin represented by the structural formula:
##STR5## wherein R is a divalent hydrocarbon radical of a dihydric phenol and the average value of n is from about 2 to about 35 and
(b) a polyamine having at least two amine nitrogen atoms per molecule, at least three reactive amine hydrogen atoms per molecule and no other groups reactive with epoxide groups,
wherein about 1 mol of (b) is reacted with each epoxide equivalent of (a), said adduct having an active amine hydrogen equivalent weight of about 140 to about 1700 and an amine nitrogen equivalent weight of about 140 to about 2600;
(2) at least one organic aliphatic hydroxyl containing co-solvent having a solubility parameter polar component between about 2.6 and about 3.9 (cal/cm.sup.3).sup.1/2 present in an amount of from about 5 to about 45% by weight based on the weight of the polyepoxide-amine adduct and co-solvent;
and
(3) water in an amount sufficient to bring the solids content of the mixture to below 40% by weight, based on the weight of adduct, co-solvent and water;
(B) as a second component the mixture of:
(1) at least one polyepoxide crosslinker which is the glycidyl polyether of a polyhydric phenol having an epoxide equivalent weight of from about 150 to about 1000;
(2) at least one silane represented by the structural formula:
R.sub.2 --CH.sub.2).sub.X Si--OR.sub.1).sub.3
wherein R.sub.1 is an alkyl group of from about 1 to about 4 carbons;
R.sub.2 is an organo functional radical selected from the group consisting of amino, glycidyl, epoxy cycloaliphatic wherein the cycloaliphatic group contains from about 5 to about 7 carbons, mercapto, ureido, amino alkylimino wherein the alkyl group contains from about 1 to about 6 carbons;
and x is an integer of from about 2 to about 5;
(3) at least one surface active agent selected from the group consisting of anionic, non-ionic and cationic characterized by their compatibility with the mixed components of the system;
and
(4) optionally at least one co-solvent of the type employed in the first component in an amount of from about 0 to about 90%, by weight, based on the weight of co-solvent and crosslinker;
and
(C) as a third component an aqueous emulsion of at least one system compatible natural or synthetic wax emulsified in water with at least one system compatible surfactant of the type employed in the second component, said surfactant and water being present in the third component in at least an amount sufficient to emulsify said wax;
and
wherein the amounts of said polyepoxide crosslinker, and silane, present in the second component, the amount of said wax present in the third component, and the combined amount of surface active agent present in the second and third components are such that when the three components of the system are mixed the solids content of said mixture thereof contains (i) the polyepoxide crosslinker in an amount sufficient to achieve an epoxy crosslinker to reactive adduct amine hydrogen equivalent weight ratio of from about 0.25:1.0 to about 1.5:1.0;
(ii) the silane in an amount of from about 0.5 to about 10%, by weight, based on the weight of said solids content;
(iii) the wax in an amount of from about 1 to about 50%, by weight, based on the weight of said solids content;
and (iii) the surface active agent in an amount of from about 1 to about 10%, by weight, based on the weight of said solids content.

23 more elements

Glass bottle coating composition made from a salt of a polyamine terminated polyepoxide adduct, an epoxy crosslinker, a reactive silane, a surfactant and a natural or synthetic wax

Life of this patent

Glass bottle coating composition made from a salt of a polyamine terminated polyepoxide adduct, an epoxy crosslinker, a reactive silane, a surfactant and a natural or synthetic wax

Life of this patent

Abstract

Claims8