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US 4,540,752 AGranted
Epoxy coating compositions with improved weatherability
AssigneeThe Dow Chemical Company
InventorRussell T. McFadden
Life of this patent
Estimating the term…
Abstract
Solvent soluble epoxy-containing compositions prepared by polymerizing ethylenically unsaturated monomers such as alkyl acrylates in the presence of the reaction product of a liquid epoxy resin such as a diglycidyl ether of bisphenol A and acrylic acid and/or methacrylic acid. These compositions are useful in the preparation of coatings.
Claims6
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.
7 more elements
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.
11 more elements
Dependencies are inferred from the claim text.