Water-borne coating composition made from epoxy resin, polymeric acid and tertiary amine
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames F. Matthews, Eugene G. Sommerfeld
Life of this patent
Estimating the term…
Abstract
Water-borne reaction products of (a) carboxyl-functional polymers; (b) polyepoxides; and (c) tertiary amines are useful as film-forming components of coating compositions which can be spray-, flow-, dip-, roller-, or electro-coated. The coating compositions are useful as such or can be crosslinked with crosslinking agents such as a nitrogen resin and, when coated on metal and paper substrates, they provide coatings of improved properties, including a high degree of flexibility during machining and stamping of the coated articles, corrosion resistance, gloss, hydrolytic stability, and nonadulterating of foods and beverages in contact therewith.
Claims41
A water-borne coating composition consisting essentially of liquid carrier and the reaction product of:
- (A) not less than 50% by weight, based on the weight of (A) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having an epoxy equivalent weight of 750-5000;
- (B) a carboxyl-functional polymer in an amount sufficient to provide at least 1.25 equivalents of carboxyl groups, when the source of the carboxyl group is a mono-protic acid, and at least 2.0 equivalents of carboxyl groups, when the source of such groups is a diprotic acid, per equivalent of 1,2-epoxy groups in the epoxy resin, said polymer having a weight average molecular weight (determined by light scattering) of about 10000-160000 and an acid number of 100-500;
- (C) an aqueous solution of at least 1.25 equivalents of a tertiary amine per equivalent of 1,2-epoxy groups in the epoxy resin, said tertiary amine being selected from the group consisting of R.sub.1 R.sub.2 R.sub.3 N, pyridine, N-methylpyrrole, N-methyl piperidine, N-methyl pyrrolidine, N-methyl morpholine, and mixtures thereof and wherein R.sub.1 and R.sub.2 are substituted or unsubstituted monovalent alkyl groups containing one or two carbon atoms in the alkyl portion and R.sub.3 is a substituted or unsubstituted monovalent alkyl group containing 1-4 carbon atoms;
- and
- (D) optionally, 10-90% of the amount required for stoichiometric reaction with the carboxyl-functional polymer of (B) of at least one primary, secondary or tertiary amine or monofunctional quaternary ammonium hydroxide;
- wherein Y is at least about 6+0.75(2.sup.X) wherein Y is the milliequivalent of carboxyl groups neutralized with primary, secondary or tertiary amine or monofunctional quaternary ammonium hydroxide per 100 grams of acid polymer plus epoxy, and X is the epoxy equivalent weight divided by 1000;
- and wherein for increasing ratios of carboxyl groups to 1,2-epoxy groups, the amount of amine is increased to keep the carboxyl-functional polymer water dispersible.
A water-borne coating composition consisting essentially of liquid carrier and the reaction product of:
- (A) 50-90%, based on the weight of (A) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having an epoxy equivalent weight of 875-2500;
- (B) a carboxyl-functional polymer in an amount sufficient to provide about 2.5 equivalents of carboxyl groups per equivalent of 1,2-epoxy groups in the epoxy resin, wherein said polymer has a composition of styrene/acrylonitrile/itaconic acid//45-84/10-30/11.5-17.4, a weight average molecular weight (determined by light scattering) of 60,000-100,000 and an acid number of 100-150;
- and
- (C) an aqueous solution of about 2.5 equivalents of dimethyl ethanol amine per equivalent of 1,2-epoxy groups in the epoxy resin;
- wherein components (A), (B) and (C) comprise about 0.1-50% by weight of the coating composition and the remainder is comprised of water and organic liquid(s) in a volume ratio from 70:30 to 90:10.
A water-borne coating composition consisting essentially of liquid carrier and the reaction product of:
- (A) 50-90%, based on the weight of (A) plus (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having an epoxy equivalent weight of 875-2500;
- (B) a carboxyl-functional polymer in an amount sufficient to provide about 2.5 equivalents of carboxyl groups per equivalent of 1,2-epoxy groups in the epoxy resin, wherein said polymer has a composition of styrene/ethyl acrylate/methacrylic acid//20-70/10-60/15.3-23, a weight average molecular weight (determined by light scattering) of 60,000-100,000 and an acid number of 100-150;
- and
- (C) an aqueous solution of about 2.5 equivalents of dimethyl ethanol amine per equivalent of 1,2-epoxy groups in the epoxy resin;
- wherein components (A), (B) and (C) comprise about 0.1-50% of the coating composition and the remainder is comprised of water and organic liquid(s) in a volume ratio from 70:30 to 90:10.
A water-borne coating composition consisting essentially of liquid carrier and the reaction product of:
- (A) 50-90%, based on the weight of (A) and (B), of an epoxy resin containing, on the average, two terminal 1,2-epoxy groups per molecule and having an epoxy equivalent weight of 875-2500;
- (B) a carboxyl-functional polymer in an amount sufficient to provide about 2.0 equivalents of carboxyl groups per equivalent of 1,2-epoxy groups in the epoxy resin, wherein said polymer has a composition of methyl methacrylate/ethyl acrylate/acrylic acid/N-isobutoxymethyl (meth)acrylamide//20-40/30-74/12.8-19.3/0-20, a weight average molecular weight (determined by light scattering) of 60,000-100,000 and an acid number of 100-150;
- and
- (C) an aqueous solution of about 2.0 equivalents of dimethyl ethanol amine per equivalent of 1,2-epoxy groups in the epoxy resin;
- wherein components (A), (B) and (C) comprise about 0.1-50% of the coating composition and the remainder is comprised of water and an organic liquid(s) in a volume ratio from 70:30 to 90:10.
Dependencies are inferred from the claim text.