Cathodically depositable binders (iii)

Details Cathodically depositable binders (iii) Cathodically depositable binders (iii)

C - Chemistry, Metallurgy

08

L

400/5119

C08L 101/00 (2006.01) C08L 63/00 (2006.01) C09D 5/44 (2006.01)

Patent

CA 1085530

ABSTRACT OF THE DISCLOSURE Aqueous emulsions of binders for cathodically depositable aqueous coating compositions comprising emulsions of (A) 98 to 50 percent by weight of at least one water-soluble self-crosslinking cationic resin which is water-dilutable upon partial or total neutralization with an inor- ganic or organic acid and having at least 0. 5 basic nitrogen atoms in 1000 molecular weight units and a double bond number of at least 0. 5; and (B) 2 to 50 percent by weight of a water-insoluble self-crosslinking poly- condensation resin or polymerization resin having a double bond number of at least 0.8. Optionally, the water-insoluble self-crosslinking resin can include basic character but insufficient to provide water solubility. The emulsions have excellent stability without use of other emulsifiers even in substantially diluted form usual for electrodeposition baths. The emulsions when used in coating compositions provide films which have good adhesion characteristics, cure at relatively low temperatures and relatively short curing times to provide films having excellent resistance to water, chemicals, and corrosion. -2-

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