Stable aqueous epoxy dispersions
AssigneeCelanese Corporation
InventorsJimmy D. Elmore, Joseph L. Cecil
Life of this patent
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Abstract
Stable epoxy dispersion compositions are prepared by emulsifying in water a self-emulsifying epoxy resin film forming component which is the reaction product of (a) a diglycidyl ether of a dihydric phenol, (b) a dihydric phenol and (c) a diglycidyl ether of a polyoxyalkylene glycol. The stable dispersions can be modified by the addition of an aliphatic monoepoxide reactive diluent to the dispersion. The epoxy dispersion compositions when combined with epoxy resin curing agents are useful as coating compositions.
Claims19
A stable epoxy dispersion composition comprising (1) an aqueous medium;
- and (2) between about 50-70 weight percent of self-emulsifying epoxy resin which is the addition product of reactants comprising (a) 40-90 parts by weight of diglycidyl ether of dihydric phenol, (b) 5-35 parts by weight of dihydric phenol, and (c) 2-15 parts by weight of diglycidyl ether of polyoxyalkylene glycol, wherein the molecular weight of the epoxy resin is in the range between about 500-20,000.
A stable epoxy dispersion composition comprising (1) an aqueous medium;
- (2) between about 50-70 weight percent of self-emulsifying epoxy resin which is the addition product of reactants comprising (a) 40-90 parts by weight of diglycidyl ether of dihydric phenol, (b) 5-35 parts by weight of dihydric phenol, and (c) 2-15 parts by weight of diglycidyl ether of polyoxyalkylene glycol, wherein the molecular weight of the epoxy resin is in the range between about 500-20,000;
- and (3) 1-25 weight percent, based on resin solids weight, of water-immiscible C.sub.8 -C.sub.80 aliphatic monoepoxide reactive diluent.
A freeze-thaw resistant epoxy dispersion composition comprising (1) an aqueous medium;
- (2) between about 50-70 weight percent of self-emulsifying epoxy resin which is the addition product of reactants comprising (a) 40-90 parts by weight of diglycidyl ether of dihydric phenol, (b) 5-35 parts by weight of dihydric phenol and (c) 2-15 parts by weight of diglycidyl ether of polyoxyalkylene glycol, wherein the molecular weight of the epoxy resin is in the range between about 500-20,000;
- (3) 1-25 weight percent, based on resin solids weight, of water-immiscible C.sub.8 -C.sub.20 aliphatic monoepoxide reactive diluent;
- and (4) 5-20 weight percent, based on resin solids weight, of water-miscible solvent selected from C.sub.2 -C.sub.10 glycols and glycol ethers.
A water-borne paint composition comprising (1) an aqueous medium;
- (2) between about 50-70 weight percent of self-emulsifying epoxy resin which is the addition product of reactants comprising (a) 40-90 parts by weight of diglycidyl ether of dihydric phenol, (b) 5-35 parts by weight of dihydric phenol, and (c) 2-15 parts by weight of diglycidyl ether of polyoxyalkylene glycol, wherein the average molecular weight of the epoxy resin is in the range between about 500-20,000;
- and (3) polyamine curing agent, wherein the ratio of active amino hydrogens to epoxy groups is in the range between about 0.5-2:1.
A one-package water-borne epoxy coating composition comprising (1) an aqueous medium;
- (2) between about 50-70 weight percent of self-emulsifying epoxy resin which is the addition product of reactants comprising (a) 40-90 parts by weight of diglycidyl ether of dihydric phenol, (b) 5-35 parts by weight of dihydric phenol, and (c) 2-15 parts by weight of diglycidyl ether of polyoxyalkylene glycol, wherein the average molecular weight of the epoxy resin is in the range between about 500-20,000;
- and (3) a curing agent which is substantially unreactive with epoxy groups at ambient temperature, and which is epoxy-interacting and thermosetting at a temperature in the range between about 90.degree.-250.degree. C.
Dependencies are inferred from the claim text.