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US 9,068,089 B2Granted
Phenolic admix for electrodepositable coating composition containing a cyclic guanidine
AssigneePPG Industries Ohio, Inc.
InventorsEllor J. Van Buskirk, Craig A. Wilson, David Stone
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Abstract
The present invention is directed to an electrodepositable coating composition comprising a reaction product of an epoxy functional polymer and a cyclic guanidine, and a source of unreacted phenol, wherein the electrodepositable coating composition has a columbic usage of less than 100 coulombs/gram when deposited on a conductive substrate at a current density of ≦1.5 mAmps/cm2. Methods of making the electrodepositable coating composition are also disclosed.
Claims19
An electrodepositable coating composition comprising:
- a reaction product of an epoxy functional polymer and a cyclic guanidine;
- and
- a source of unreacted phenol,
- wherein the electrodepositable coating composition has a columbic usage of less than 100 coulombs/gram when deposited on a conductive substrate at a current density of ≦1.5 mAmps/cm2.
1 more element
A method for coating a metal substrate comprising:
- forming a reaction product comprising an epoxy functional polymer and a cyclic guanidine;
- and
- adding a source of unreacted phenol to the reaction product to form an electrodepositable coating composition.
Dependencies are inferred from the claim text.