ELECTRODEPOSITABLE COATING COMPOSITION HAVING IMPROVED CRATER CONTROL

• Main Authors: KAYLO, ALAN J, SZYMANSKI, CHESTER J, ESWARAKRISHNAN, VENKATACHALAM, WILSON, CRAIG A, LEWAND, ALYCIA, SWANGER, JOSEPH R, BICE, JO-ANN E
• Format: Patent
• Language: English; French
• Published: 24.11.2020
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; USE OF MATERIALS THEREFOR; WOODSTAINS

Oil contamination on substrate surfaces is problematic for electrodepositable coating compositions. Oil deposits, such as oils used in automotive assembly lines, result in the formation of defects in the cured coating in the form of craters. These craters form when the electrodepositable coating composition de-wets from the area around where the oil was deposited and the coating may cure around the oil deposit. The formation of craters affects both the smoothness and appearance of the cured coating and requires extra processing steps, such as sanding, to achieve the desired coating finish. The present invention is directed towards an electrodepositable coating composition comprising a polyamine-dialdehyde adduct comprising a polymerization product of a polyamine and a dialdehyde. Also disclosed are methods of making the electrodepositable coating composition, methods of coating a substrate, and substrates treated with the electrodepositable coating composition. La présente invention concerne une composition de revêtement électrodéposable comprenant un produit d'addition polyamine-dialdéhyde comprenant un produit de polymérisation d'une polyamine et d'un dialdéhyde. L'invention concerne également des procédés de fabrication de la composition de revêtement électrodéposable, des procédés de revêtement d'un substrat et des substrats traités avec la composition de revêtement électrodéposable.