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US 12,398,289 B2Granted
Electrocoat composition
AssigneeAxalta Coating Systems IP Co., LLC
InventorsThomas Huesmann, Konstantinos Markou, Tim Koesterke
Life of this patent
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Abstract
Aqueous electrocoat compositions having improved throwing power and methods for coating electrically conductive substrates are provided. An exemplary composition includes water, a crosslinkable resin including a binder and a crosslinking agent, and a pigment paste. The exemplary electrocoat composition has a pigment/binder (P/B) ratio of less than about 0.15:1.
Claims16
An aqueous electrocoat composition comprising:
- water;
- a crosslinkable resin including a binder and a crosslinking agent;
- a pigment paste;
- a neutralizing agent for neutralizing the binder, wherein the neutralizing agent comprises at least one acid selected from the group consisting of formic acid, dimethylolpropionic acid (DMPA), lactic acid, and acetic acid, wherein the neutralizing agent has a pKa value of from 3.7 to 4.8 and is substantially free of acids having a pKa value of less than 3.7;
- and
- a water-soluble polyvinyl alcohol (PVA) (co)polymer(s), wherein the composition comprises from 100 to about 300 ppm (parts per million) of the water-soluble polyvinyl alcohol (co)polymer(s),
- wherein the electrocoat composition has a pigment/binder (P/B) ratio of less than 0.15:1, and
- wherein the electrocoat composition, when tested according to DIN EN ISO 55655-2 with a 28 cm immersion depth, 4 mm distance, and film build outside 20-22 micrometers, exhibits a maximum throwing power range of at least 26 cm.
5 more elements
An aqueous electrocoat composition comprising:
- water;
- a crosslinkable resin including a binder and a crosslinking agent;
- a pigment paste;
- and
- a water-soluble polyvinyl alcohol (PVA) (co)polymer(s), wherein the composition comprises from 100 to 300 ppm (parts per million) of the water-soluble polyvinyl alcohol (co)polymer(s),
- wherein the electrocoat composition has a pigment/binder (P/B) ratio of less than 0.15:1, and
- wherein the electrocoat composition, when tested according to DIN EN ISO 55655-2 with a 28 cm immersion depth, 4 mm distance, and film build outside 20-22 micrometers, exhibits a maximum throwing power range of at least 26 cm.
4 more elements
Dependencies are inferred from the claim text.