Catalyst composition and curable polymer compositions containing same
AssigneeM&T Chemicals Inc.
InventorsHoward H. Leiner, Emily C. Bossert
Life of this patent
Estimating the term…
Abstract
A portion of the tin compounds conventionally employed to cure polymer compositions containing hydroxyl and isocyanate groups can be replaced by salts or chelated coordination complexes of divalent copper, zinc, nickel, iron, cobalt or vanadium without any substantial decrease in cure rate or solvent resistance of the cured coating.
Claims31
A composition for catalyzing the curing reaction between a blocked organic polyisocyanate and a polymer having hydroxyl groups capable of reacting with polyisocyanates said catalyst composition comprising:
- (1) a divalent metal compound selected from the group consisting of salts and chelated coordination complexes of copper.sup.II, zinc.sup.II, nickel.sup.II, iron.sup.II, cobalt.sup.II and vanadium.sup.II and
- (2) an amount of a tin-containing urethane catalyst sufficient to increase the catalytic effectiveness of said divalent metal compound wherein said tin-containing catalyst is present in an amount from about 10% by weight of the combined weight of said divalent metal compound and tin-containing urethane catalyst in said composition.
A curable polymeric composition comprising
- (a) a polymeric component containing pendant hydroxyl groups capable of reacting with polyisocyanates and an organic polyisocyanate component containing at least two blocked isocyanate groups or a polymeric component containing both pendant hydroxyl groups and blocked isocyanate groups, and
- (b) a catalytically effective amount of a catalyst composition comprising a divalent metal compound selected from the group consisting of salts and chelated coordination complexes of copper.sup.II, zinc.sup.II, nickel.sup.II, iron.sup.II, cobalt.sup.II, and vanadium.sup.II and a tin-containing urethane catalyst in an amount sufficient to increase the catalytic effectiveness of said divalent metal compound and wherein said tin-containing catalyst constitutes from about 10% by weight of the combined weight of divalent metal and tin-containing catalyst.
In a method for catalyzing the curing reaction between polymers having hydroxyl groups capable of reacting with polyisocyanates and blocked organic polyisocyanates, the improvement which comprises employing a catalytically effective amount of a divalent metal compound selected from the group consisting of salts and chelated coordinated complexes of zinc.sup.II, copper.sup.II, nickel.sup.II, iron.sup.II, cobalt.sup.II and vanadium.sup.II and a tin-containing urethane catalyst wherein the amount of said tin-containing urethane catalyst is not catalytically effective by itself and the metal compound constitutes up to about 90% by weight of the combined weight of urethane catalyst and metal compound.
Dependencies are inferred from the claim text.