Stable, reduced gloss electrocoat compositions and methods for using the same
AssigneePPG Industries Ohio, Inc.
InventorsUdo Retzlaff, Anna K. Gaines
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Abstract
Electrocoat compositions providing coatings having reduced gloss levels are disclosed. The reduction in gloss is achieved through the incorporation of a solid polymer additive to a standard electrocoat composition. The polymer additive includes particulate polyacrylate, particulate aliphatic polyurethane/polyurea copolymers, or mixtures thereof. Low and medium gloss compositions can be achieved. A paste containing these polymer additives is also disclosed. Methods for using these compositions are also disclosed, as are methods for reducing the gloss of an E-coat composition.
Claims45
An electrocoat composition comprising:
- a) an electrodepositable resin and
- b) a solid particulate polyacrylate, a solid particulate aliphatic polyurethane/polyurea copolymer or mixtures thereof.
An electrocoat paste suitable for use in an electrocoat composition, comprising:
- a) a grind vehicle;
- and
- b) a solid particulate polyacrylate, a solid particulate aliphatic polyurethane/polyurea copolymer, or mixtures thereof.
A method for reducing the gloss of a coating deposited on a substrate by electrodeposition in which an effective amount of either a solid particulate polyacrylate, a solid particulate aliphatic polyurethane/polyurea copolymer, or both, is added to a composition that is subjected to the electrodeposition process.
A method for making an electrocoat composition having a sedimentation rate lower than 25 mg/hr comprising adding a solid particulate polyacrylate, a solid particulate aliphatic polyurethane/polyurea copolymer, or both, to the electrocoat composition.
An electrocoat composition having a sedimentation rate of lower than 50 mg/hour, in which the coating deposited from said composition has a 60° gloss of 70 or less and a gloss retention of at least 50 percent following 300 hours of QUV exposure.
Dependencies are inferred from the claim text.