Cationic microgels and their use in electrodeposition
AssigneePPG Industries, Inc.
InventorsVictor G. Corrigan, Steven R. Zawacky
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Abstract
A cationic microgel dispersion and the use of the dispersion in the method of cationic electrodeposition is disclosed. The dispersion is prepared by a process comprising dispersing in aqueous medium a mixture of a cationic polyepoxide-amine reaction product and a polyepoxide crosslinking agent and heating the mixture to a temperature sufficient to crosslink the mixture to form said cationic microgel dispersion. The dispersion can be formulated with ungelled cationic resins to form an aqueous resin dispersion which is suitable for use in the process of cationic electrodeposition providing for improved edge coverage and crater control.
Claims23
A cationic microgel dispersion which is prepared by a process comprising dispersing in aqueous medium a mixture of a cationic polyepoxide-amine reaction product which contains amine groups selected from the group consisting of primary amine groups, secondary amine groups, and mixtures thereof and a polyepoxide crosslinking agent and heating said mixture to a temperature sufficient to crosslink the mixture to form said cationic microgel dispersion.
An improved aqueous resinous dispersion suitable for use in electrodeposition comprising:
- (A) an ungelled cationic resin which is electrodepositable on a cathode and
- (B) a dispersed cationic microgel which is prepared by a process comprising dispersing in aqueous medium a reactive mixture of a cationic polyepoxide-amine reaction product and a polyepoxide crosslinking agent and heating said mixture to a temperature sufficient to crosslink the mixture to form said cationic microgel.
A cationic microgel which is prepared by a process comprising mixing a cationic polyepoxide amine reaction product which contains amine groups selected from the group consisting of primary amine groups, secondary amine groups, and mixtures thereof and a polyepoxide crosslinking agent and heating the mixture to a temperature sufficient to crosslink the mixture to form said cationic microgel.
A cationic microgel dispersion which is prepared by a process comprising dispersing in aqueous medium a mixture of a cationic polyepoxideamine reaction product which contains amine groups selected from the group consisting of primary amine groups, secondary amine groups, and mixtures thereof and a polyepoxide crosslinking agent and heating said mixture to a temperature sufficient to crosslink the mixture to form said cationic microgel dispersion, wherein said cationic microgel dispersion has a particle size of less than about 2,000 Angstroms.
Dependencies are inferred from the claim text.