Sherwin-Williams patents metal coating

February 15, 2012

US 8,084,137 B2
The Sherwin-Williams Company has been awarded a patent for a coating composition comprised of a phosphate functional polyester polyol, which is the esterification reaction product of a monomer blend comprised of at least one phosphorus containing monomer selected from the group consisting of phosphonopolycarboxylic acids and phosphonopolycarboxylic anhydrides and at least one other non-phosphorus containing monomer selected from di- or higher polyols, diacids, and anhydrides; and a curing agent suitable for crosslinking with at least one of the hydroxyl groups of the phosphate functional polyester polyol.