Single-component moisture-curable coatings based on n-substituted urea polymers with extended chains and terminal alkoxysilanes
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorErick B. Iezzi
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Abstract
Moisture-curable single-component (1K) coatings based on N-substituted urea polymers with extended chains and terminal alkoxysilane groups. The coatings are highly flexible, are gloss retentive, provide fast tack-free and dry-through times, provide high solvent resistance, and provide excellent exterior color stability to sunlight. The coatings can be formulated to produce high-gloss, semi-gloss and low-gloss finishes, and thus have application as both commercial and military coatings.
Claims25
A single-component coating composition comprising:
- an N-substituted urea polymer with extended chains and terminal alkoxysilanes, wherein said polymer is a reaction product of (a) an aliphatic polyisocyanate, (b) an N-substituted amino-functional alkoxysilane, and (c) a secondary diamine chain extender, wherein no unreacted isocycanate remains in said polymer.
A method for making a single-component coating composition, comprising:
- synthesizing an N-substituted urea polymer with extended chains and terminal alkoxysilanes from:
- (a) an aliphatic polyisocyanate with at least 2 isocyanate reactive groups per molecule;
- (b) an N-substituted amino-functional alkoxysilane;
- and
- (c) a secondary diamine chain extender, wherein no unreacted isocyanate remains in the polymer;
- and
- mixing the synthesized polymer with a catalyst, a reactive diluent, a pigment, a filler, a solvent, an additive, or any combination thereof.
Dependencies are inferred from the claim text.