Chain-extendable crosslinkable urethane modified polyhydroxy...

Details Chain-extendable crosslinkable urethane modified polyhydroxy... Chain-extendable crosslinkable urethane modified polyhydroxy...

C - Chemistry, Metallurgy

08

G

117/195, 400/545

C08G 18/80 (2006.01) C08G 18/40 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/64 (2006.01) C09D 175/08 (2006.01)

Patent

CA 1227300

- 47 - ABSTRACT OF THE INVENTION High solids, solvent-based resin composition comprises novel chain-extendable, crosslinkable urethane modified polyhydroxy oligomers, crosslinking agent and, preferably, catalyst(s). The composition cures at elevated temperature to provide a coating on a substrate, such as steel, which is highly resistant to corrosion, humidity and solvents and provides corrosion protection for the substrate. The novel oligomers can be the reaction product of a polyol with a half-blocked diisocyanate, wherein said polyol comprises three or more hydroxy, and the half-blocked diisocyanate comprises the reaction product of an organic diisocyanate with approximately one molar equivalent of a monofunctional blocking agent.

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