Electrodepositable coating compositions and related methods
First Claim
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1. An electrodepositable coating composition comprising a resinous phase and catalyst nanoparticles dispersed in an aqueous medium, the resinous phase comprising:
- (a) a active hydrogen-containing, ionic salt group-containing resin; and
(b) a curing agent; and
the catalyst nanoparticles for effecting cure between the resin (a) and the curing agent (b), the catalyst nanoparticles being selected from the group consisting of bismuth oxide;
bismuth silicate;
bismuth titanate;
molybdenum oxide;
molybdenum silicate;
molybdenum titanate;
tungsten oxide;
tungsten silicate;
tungsten titanate;
a combination of cerium oxide, zinc oxide and silicon dioxide;
a combination of cerium oxide and silicon dioxide; and
combinations thereof, wherein the catalyst nanoparticles have an average B.E.T. specific surface area greater than 20 square meters per gram (m2/g).
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Abstract
An electrodepositable coating composition is provided including a resinous phase and catalyst nanoparticles dispersed in an aqueous medium, the resinous phase including (a) at least one active hydrogen-containing, ionic salt group-containing resin; and (b) at least one curing agent; and the catalyst nanoparticles for effecting cure between the resin (a) and the curing agent (b). The catalyst nanoparticles have an average BET specific surface area greater than 20 square meters per gram (m2/g). Methods of preparing and using the composition also are provided.
69 Citations
20 Claims
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1. An electrodepositable coating composition comprising a resinous phase and catalyst nanoparticles dispersed in an aqueous medium,
the resinous phase comprising: -
(a) a active hydrogen-containing, ionic salt group-containing resin; and
(b) a curing agent; and
the catalyst nanoparticles for effecting cure between the resin (a) and the curing agent (b), the catalyst nanoparticles being selected from the group consisting of bismuth oxide;
bismuth silicate;
bismuth titanate;
molybdenum oxide;
molybdenum silicate;
molybdenum titanate;
tungsten oxide;
tungsten silicate;
tungsten titanate;
a combination of cerium oxide, zinc oxide and silicon dioxide;
a combination of cerium oxide and silicon dioxide; and
combinations thereof, wherein the catalyst nanoparticles have an average B.E.T. specific surface area greater than 20 square meters per gram (m2/g). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for electrocoating a conductive substrate serving as a cathode in an electrical circuit comprising the cathode and an anode, the cathode and anode being immersed in an aqueous electrocoating composition,
the method comprising passing electric current between the cathode and anode to cause deposition of the electrocoating composition onto the substrate as a substantially continuous film, the aqueous electrocoating composition comprising a resinous phase and catalyst nanoparticles dispersed in an aqueous medium, the resinous phase comprising: -
(a) a active hydrogen-containing, ionic salt group-containing resin; and
(b) a curing agent; and
the catalyst nanoparticles for effecting cure between the resin (a) and the curing agent (b), the catalyst nanoparticles being selected from the group consisting of bismuth oxide;
bismuth silicate;
bismuth titanate;
molybdenum oxide;
molybdenum silicate;
molybdenum titanate;
tungsten oxide;
tungsten silicate;
tungsten titanate;
a combination of cerium oxide, zinc oxide and silicon dioxide;
a combination of cerium oxide and silicon dioxide; and
combinations thereof, wherein the catalyst nanoparticles have an average B.E.T. specific surface area greater than 20 square meters per gram (m2/g).
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Specification
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Current AssigneePPG Industries Ohio Incorporated (Nouryon BV)
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Original AssigneePPG Industries Ohio Incorporated (Nouryon BV)
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InventorsWhite, Michael, Hung, Cheng-Hung, Vanier, Noel, McCollum, Gregory, Kaylo, Alan
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Application NumberUS11/213,174Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current204/471CPC Class CodesC09D 5/4496 characterised by the nature...
