Organic solvent free pigment dispersant for waterborne electrocoating
AssigneeE. I. Du Pont de Nemours and Company
InventorTaddesse Gebregiorgis
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Abstract
A pigment dispersing resin is disclosed along with pigment dispersion, electrodepositable coating compositions using the pigment dispersing resin, and methods for applying the electrodepositable coating composition. The pigment dispersing resin consists essentially of the carboxylic acid salt of an aminated bisphenol epoxy resin and an alkoxylated styrenated phenol. Pigment dispersions made from the dispersing resin are especially useful for forming low or no volatile organic content electrocoating baths.
Claims17
A pigment dispersant consisting essentially of
- A) an aminated epoxy resin of formula (I)
- J is the residue of a bisphenol epoxy resin and each of R1, R2, R3 and R4 are independently selected from the group consisting of H, C1 to C4 alkyl, C1 to C6 hydroxy alkyl, carbocycle or heterocycle containing moiety and optionally, R1 and R2 or R3 and R4 can be taken together to form a cyclic structure and wherein the amine groups are 80 percent to 100 percent neutralized with a carboxylic acid;
- B) an alkoxylated styrenated phenol;
- and
- C) water
- wherein the pigment dispersant is essentially free from volatile organic solvents.
A pigment dispersing resin consisting essentially of
- A) an aminated epoxy resin of formula (I)
- wherein J is the residue of a bisphenol epoxy resin and each of R1, R2, R3 and R4 are independently selected from the group consisting of H, C1 to C4 alkyl, C1 to C6 hydroxy alkyl, carbocycle or heterocycle containing moiety and optionally, R1 and R2 or R3 and R4 can be taken together to form a cyclic structure and wherein the amine groups are 80 percent to 100 percent neutralized with a carboxylic acid;
- B) an alkoxylated styrenated phenol;
- and
- wherein the pigment dispersing resin is essentially free from volatile organic solvents.
A cathodic electrocoating composition comprising an electrodepositable binder composition, a pigment dispersant and pigment;
- wherein the pigment dispersant consists essentially of
- A) an aminated epoxy resin of formula (I)
- wherein J is the residue of a bisphenol epoxy resin and each of R1, R2, R3 and R4 are independently selected from the group consisting of H, C1 to C4 alkyl, C1 to C6 hydroxy alkyl, carbocycle or heterocycle containing moiety and optionally, R1 and R2 or R3 and R4 can be taken together to form a cyclic structure and wherein the amine groups are 80 percent to 100 percent neutralized with a carboxylic acid;
- B) an alkoxylated styrenated phenol;
- and
- C) water;
- wherein the pigment dispersant is essentially free from volatile organic solvents.
A method for forming a coating on a substrate comprising depositing an electrodepositable coating composition on a conductive substrate wherein the electrodepositable coating composition comprises a pigment dispersant and pigment and said pigment dispersant consists essentially of
- A) an aminated epoxy resin of formula (I)
- wherein J is the residue of a bisphenol epoxy resin and each of R1, R2, R3 and R4 are independently selected from the group consisting of H, C1 to C4 alkyl, C1 to C6 hydroxy alkyl and wherein the amine groups are 80 percent to 100 percent neutralized with a carboxylic acid;
- B) an alkoxylated styrenated phenol;
- and
- wherein the pigment dispersant is essentially free from volatile organic solvents;
- and
- curing said deposited electrodepositable coating composition.
Dependencies are inferred from the claim text.