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US 7,169,876 B2Granted
Dual cure polyurea coating composition
AssigneeFreda Incorporated
InventorRichared E. Asher
Life of this patent
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Abstract
A two component polyurea coating composition that exhibits a dual cure phenomena. The coating composition comprises a polyaspartic ester that is combined together with a polyisocyanate in such a manner that the polyisocyanate is present is an amount that is greater than a normal stoichiometric amount for the polyaspartic ester. By over indexing the polyaspartic ester with the polyisocyanate advantages of moisture curing and or “fast curing” can be combined together in the final finish.
Claims14
A coated object comprising:
- a substrate;
- and
- a coating on said substrate which comprises a cured non-aqueous polyurea coating composition comprising a polyaspartic ester and a polyisocyanate, wherein the polyisocyanate is present in an amount that is greater than a normal stoichiometric amount for the polyaspartic ester prior to curing, such that the coating composition provides a hybrid curing system that combines the fast cure of a polyaspartic ester polyurea reaction with the enhanced adhesion and superior film properties of a slower moisture cure polyurea wherein the coating composition cures dry to handle after air drying at 72° F. and 40% relative humidity in less than 120 minutes.
Dependencies are inferred from the claim text.