Organosulfur bismuth compounds and their use in electrodepositable coating compositions
AssigneePPG Industries Ohio, Inc.
InventorsRaphael O. Kollah, Brian E. Woodworth, Lawrence G. Anderson, Matthew S. Scott
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Abstract
A composition is provided comprising a reaction product of (1) a bismuth compound; and (2) an heterocyclic compound having mercapto functionality. Such compositions are useful in electrodepositable compositions further comprising an active hydrogen-containing, cationic salt group-containing resin and a capped polyisocyanate curing agent. These electrodepositable compositions may be prepared without the use of conventional lead or tin catalysts and exhibit excellent properties as cured coatings.
Claims18
An electrodepositable composition comprising:
- (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode;
- (b) a capped polyisocyanate curing agent;
- and
- (c) a catalyst composition comprising a reaction product of
- (1) a bismuth compound;
- and
- (2) a heterocyclic compound having mercapto functionality.
A method of electrocoating an electroconductive substrate which serves as a cathode in an electrical circuit comprising the cathode and an anode immersed in an aqueous electrodepositable composition containing a cationic water dispersible resin, said method comprising passing an electric current between the anode and the cathode to cause the electrodepositable composition to deposit on the cathode as a substantially continuous film, and heating the electrodeposited film at an elevated temperature to cure the film, wherein the electrodepositable composition comprises:
- (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode;
- (b) a capped polyisocyanate curing agent;
- and
- (c) a catalyst composition comprising a reaction product of
- (1) a bismuth compound;
- and
- (2) a heterocyclic compound having mercapto functionality.
Dependencies are inferred from the claim text.