Coating/sealant systems, aqueous resinous dispersions, and methods of electrocoating
AssigneePRC-DeSoto International, Inc.
InventorsJoseph Theodore Valko, Robin M. Peffer, Michael A. Mayo, Lawrence G. Anderson, Thor G. Lingenfelter, Beth Furar
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Abstract
A coating/sealant system that includes a coating and a sealant deposited over at least a portion of the coating, in which the coating includes a reaction product formed from reactants comprising a phosphated epoxy resin and a curing agent, and the sealant includes a sulfur-containing polymer.
Claims30
A coating/sealant system comprising:
- (a) a coating comprising a reaction product formed from reactants comprising:
- (i) a phosphated epoxy resin comprising a reaction product of reactants comprising:
- a polyepoxy;
- and
- a sulfur-functional azole selected from the group consisting of a mercaptoarylimidazole, a mercaptoaryloxazole, a mercaptoarylthiazole, and a combination of any of the foregoing;
- and
- a phosphorous acid or a mixture of a phosphoric acid, and an organophosphonic acid and/or an organophosphinic acid;
- and
- (ii) a curing agent comprising an aminoplast;
- and
- (b) a sealant deposited over at least a portion of the coating, wherein the sealant is deposited from a composition comprising a sulfur-containing polymer comprising a thiol-functional polysulfide.
An aqueous resinous dispersion comprising a base-neutralized resinous composition comprising an ungelled phosphated epoxy resin, wherein the ungelled phosphated epoxy resin comprises a reaction product formed from reactants comprising:
- a polyepoxy;
- a sulfur-functional azole selected from the group consisting of a mercaptoarylimidazole, a mercaptoaryloxazole, a mercaptoarylthiazole, and a combination of any of the foregoing;
- and
- a phosphorous acid or a mixture of a phosphoric acid, and an organophosphonic acid and/or an organophosphinic acid.
A method of electrocoating an electrically conductive substrate serving as an anode in an electrical circuit comprising the anode and a cathode that are immersed in an aqueous resinous dispersion comprising passing electric current between the anode and the cathode to cause a resinous composition to deposit on the anode, the dispersion comprising an anionic resin comprising a reaction product formed from reactants comprising:
- a polyepoxy;
- a sulfur-functional azole selected from the group consisting of a mercaptoarylimidazole, a mercaptoaryloxazole, a mercaptoarylthiazole, and a combination of any of the foregoing;
- and
- a phosphorous acid or a mixture of a phosphoric acid, and an organophosphonic acid and/or an organophosphinic acid.
A method for making a base-neutralized aqueous resinous dispersion comprising:
- (a) reacting a sulfur-functional azole with a polyepoxide to form a first reaction product, wherein the sulfur-functional azole is selected from the group consisting of a mercaptoarylimidazole, a mercaptoaryloxazole, a mercaptoarylthiazole, and a combination of any of the foregoing;
- (b) reacting the first reaction product with a phosphorous acid or a mixture of a phosphoric acid, and an oranophosphonic acid and/or an oranophosphinic acid to form a second reaction product;
- and
- (c) adding a base and water to the second reaction product.
A method for making a base-neutralized aqueous resinous dispersion comprising:
- (a) reacting a polyepoxide with a phosphorous acid or a mixture of a phosphoric acid, and an organophosphonic acid and/or an organophosphinic acid to form a first reaction product;
- and
- (b) reacting the first reaction product with a sulfur-functional azole to form a second reaction product, wherein the sulfur-functional azole is selected from the group consisting of a mercaptoarylimidazole, a mercaptoaryloxazole, a mercaptoarylthiazole, and a combination of any of the foregoing;
- and
- (c) adding a base and water to the second reaction product.
Dependencies are inferred from the claim text.