Solid pigmented resin-crosslinker mixture for use in aqueous coatings
AssigneeBASF Coatings GmbH
InventorCharles L. Tazzia
Life of this patent
Estimating the term…
Abstract
A pigmented granular pigmented coating feedstock is prepared by melting a resin, which can be a solid resin based on polymerizable ethylenically unsaturated monomer or epoxy based resin, and a solid or viscous curing agent, blending the molten mass, and cooling to form a solid. The solid blend of resin and curing agent is ground to produce a granular feedstock. The feedstock is readily storable or shippable to a location for coating preparation. Alternatively a solid coating can be ground after shipping. An aqueous coating is made by dispersing the feedstock in water and mixing to form a dispersion. A salting agent and at least one additive can be added to form an aqueous coating composition. An article can be coated with the dispersion, for example, by electrodeposition.
Claims19
A method of producing an aqueous coating composition comprising:
- forming a solid pigmented resin-crosslinker mixture by a method comprising:
- blending an ionizable resin having pendent amino groups, a curing agent, and a pigment until homogenous at a temperature wherein the resin and the curing agent are molten;
- and
- cooling the blended resin, curing agent, and pigment until solid;
- thereby producing the solid pigmented resin-crosslinker mixture;
- shipping the solid pigmented resin-crosslinker mixture to a coating completion site;
- and
- dispersing the solid pigmented resin-crosslinker mixture in water, wherein dispersing further includes adding an acidic salting agent;
- thereby producing the aqueous coating composition, wherein the resin in the aqueous coating composition is neutralized by the acidic salting agent, rendering the resin water-dispersible and the aqueous coating composition cathodically electrodepositable.
A method of producing an aqueous coating composition comprising:
- forming a solid pigmented resin-crosslinker mixture by a method comprising:
- blending an ionizable resin having pendent amino groups and a curing agent until homogenous at a temperature wherein the resin and the curing agent are molten;
- cooling the blended resin and curing agent until solid to form a solid resin-crosslinker mixture;
- grinding the solid resin-crosslinker mixture into a powdered or granular form;
- and
- mixing the powdered or granular solid resin-crosslinker mixture and a pigment to form the solid pigmented resin-crosslinker mixture;
- shipping the solid pigmented resin-crosslinker mixture to a coating completion site;
- and
- dispersing the solid pigmented resin-crosslinker mixture in water, wherein dispersing further includes adding an acidic salting agent;
- thereby producing the aqueous coating composition, wherein the resin in the aqueous coating composition is neutralized by the acidic salting agent, rendering the resin water-dispersible and the aqueous coating composition cathodically electrodepositable.
A method of producing an aqueous coating composition comprising:
- forming a solid dyed resin-crosslinker mixture by a method comprising:
- blending an ionizable resin having pendent amino groups, a curing agent, and a dye until homogeneous at a temperature wherein the resin and curing agent are molten;
- adding liquid catalyst to the molten blend;
- cooling the molten blend to form a solid blend;
- and
- grinding the solid blend to a powdered or granular form;
- thereby producing said solid dyed resin-crosslinker mixture;
- shipping the solid dyed resin-crosslinker mixture to a coating completion site;
- and
- dispersing the solid dyed resin-crosslinker mixture in water, wherein dispersing further includes adding an acidic salting agent;
- thereby producing the aqueous coating composition, wherein the resin in the aqueous coating composition is neutralized by the acidic salting agent, rendering the resin water-dispersible and the aqueous coating composition cathodically electrodepositable.
A method of coating an article comprising:
- preparing a feedstock for an aqueous coating composition by a process comprising:
- blending a resin, a curing agent, and a pigment at a mixing temperature at or above the melting points of the resin and the curing agent to form a molten blend, wherein the resin is ionizable and has pendent amino groups;
- and
- cooling the molten blend to form a solid blend;
- dispersing the feedstock, an acidic salting agent, and at least one additive in water;
- thereby producing said aqueous coating composition, wherein the resin in said aqueous coating composition is neutralized by the acidic salting agent, rendering the resin water-dispersible and the aqueous coating composition cathodically electrodepositable;
- and
- applying the composition to the article by cathodic electrodeposition.
A method of coating an article comprising:
- preparing a feedstock for an aqueous coating composition by a process comprising:
- blending a resin and a curing agent at a mixing temperature at or above the melting points of the resin and the curing agent to form a molten blend, wherein the resin is ionizable and has pendent amino groups;
- cooling the molten blend to form a solid blend;
- grinding the solid blend to produce a powdered or granular form;
- and
- mixing the powdered or granular form and a pigment;
- dispersing the feedstock, an acidic salting agent, and at least one additive in water;
- thereby producing said aqueous coating composition, wherein the resin in said aqueous coating composition is neutralized by the acidic salting agent, rendering the resin water-dispersible and the aqueous coating composition cathodically electrodepositable;
- and
- applying the composition to the article by cathodic electrodeposition.
Dependencies are inferred from the claim text.