Epoxy coating compositions with improved weatherability

Claim 2

A solvent soluble epoxy-containing composition which comprises the product obtained by reacting in the presence of a suitable quantity of a suitable vinyl polymerization catalyst so as to effect polymerization (A) the reaction product obtained by reacting in the presence of a suitable quantity of a suitable catalyst (1) at least one material having from greater than 1 to about 4 ##STR8## per molecule wherein each R is independently hydrogen or a monovalent hydrocarbon group having from 1 to about 4 carbon atoms; X is --O--, --S-- or ##STR9## and wherein said material has an epoxide equivalent weight of from about 150 to about 400; and (2) at least one of acrylic acid or methacrylic acid; wherein components (1) and (2) are present in a quantity which provides an equivalent ratio of acid groups from component (2) to epoxy groups from component (1) of from about 0.1:1 to less than about 0.5:1; and (B) at least one monomer having at least one polymerizable ethylenically unsaturated group per molecule and which optionally contains a hydroxyl or an epoxide group; and wherein components (A) and (B) are employed in quantities such that the weight ratio of vinyl monomers to epoxy compound varies from about 0.4:1 to about 2.5:1.

Claim 3

An epoxy-containing composition of claim 1 wherein (i) the equivalent weight of component (A-1) is from about 180 to about 270; (ii) the ratio of acid groups from component (A-2) to epoxy groups from component (A-1) is from about 0.2:1 to about 0.3:1; and (iii) components (A) and (B) are employed in quantities such that the weight ratio of vinyl monomers to epoxy compound is from about 0.6:1 to about 3.0:1.

Claim 4

An epoxy-containing composition of claim 2 wherein (i) component (A-1) is a glycidyl ether of an aromatic dihydroxyl-containing compound or a mixture of such glycidyl ethers; and (ii) component (B) is styrene, n-butyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxybutyl methacrylate, or a mixture thereof.

Claim 5

A curable composition which comprises (I) an epoxy-containing composition which comprises the product obtained by reacting in the presence of a suitable quantity of a suitable vinyl polymerization catalyst so as to effect polymerization (A) the reaction product obtained by reacting in the presence of a suitable quantity of a suitable catalyst (1) at least one material having from greater than 1 to about 4 ##STR10## per molecule wherein each R is independently hydrogen or a monovalent hydrocarbon group having from 1 to about 4 carbon atoms; X is --O--, --S-- or ##STR11## and wherein said material has an epoxide equivalent weight of from about 150 to about 400; and (2) at least one of acrylic acid or methacrylic acid; wherein components (1) and (2) are present in a quantity which provides an equivalent ratio of acid groups from component (2) to epoxy groups from component (1) of from about 0.1:1 to about 0.4:1; and (B) at least one monomer having at least one polymerizable ethylenically unsaturated group per molecule and which optionally contains a hydroxyl or an epoxide group; and wherein components (A) and (B) are employed in quantities such that the weight ratio of vinyl monomers to epoxy compound is from about 0.4:1 to about 2.5:1; (II) optionally a suitable quantity of a suitable solvent system for achieving the desired application viscosity; and (III) an effective quantity of a suitable curing agent and/or catalyst for curing the composition.

Claim 6

A curable composition which comprises (I) an epoxy-containing composition which comprises the product obtained by reacting in the presence of a suitable quantity of a suitable vinyl polymerization catalyst so as to effect polymerization (A) the reaction product obtained by reacting in the presence of a suitable quantity of a suitable catalyst (1) at least one material having from greater than 1 to about 4 ##STR10## per molecule wherein each R is independently hydrogen or a monovalent hydrocarbon group having from 1 to about 4 carbon atoms; X is --O--, --S-- or ##STR11## and wherein said material has an epoxide equivalent weight of from about 150 to about 400; and (2) at least one of acrylic acid or methacrylic acid; wherein components (1) and (2) are present in a quantity which provides an equivalent ratio of acid groups from component (2) to epoxy groups from component (1) of from about 0.1:1 to about 0.4:1; and (B) at least one monomer having at least one polymerizable ethylenically unsaturated group per molecule and which optionally contains a hydroxyl or an epoxide group; and wherein components (A) and (B) are employed in quantities such that the weight ratio of vinyl monomers to epoxy compound is from about 0.4:1 to about 2.5:1; (II) optionally a suitable quantity of a suitable solvent system for achieving the desired application viscosity; and (III) an effective quantity of a suitable curing agent and/or catalyst for curing the composition.

Claim 7

A curable composition of claim 4 wherein (i) the equivalent weight of component (I-A-1) is from about 180 to about 270; (ii) the ratio of acid groups from component (I-A-2) to epoxy groups from component (I-A-1) is from about 0.2:1 to about 0.3:1; and (iii) components (I-A) and (I-B) are employed in quantities which provide a weight ratio of vinyl monomers to epoxy compound of from about 6:1 to about 1.5:1.

Claim 8

A curable composition of claim 5 wherein (i) component (I-A-1) is a glycidyl ether of an aromatic dihydroxyl-containing compound or a mixture of such glycidyl ethers; (ii) component (I-B) is styrene, n-butyl acrylate, 2-ethylhexyl acrylate, hydroxyethyl acrylate, hydroxybutyl acrylate, hydroxybutyl methacrylate or a mixture thereof.