Urethane-based stain-release coatings

An article comprising:

• (a) a substrate having one or more surfaces;
• and
• (b) a cured coating derived from at least one solvent and a chemical composition comprising:
• one or more urethane oligomers of at least two repeating units selected from the group consisting of fluorine-containing urethane oligomers and long-chain hydrocarbon-containing urethane oligomers, wherein said oligomers comprise the reaction product of:
• (a) one or more polyfunctional isocyanate compounds;
• (b) one or more polyols;
• (c) one or more monoalcohols selected from the group consisting of fluorocarbon monoalcohols, optionally substituted long-chain hydrocarbon monoalcohols, and mixtures thereof;
• and
• (d) one or more silanes of the following formula (I):
• X—R1Si—(Y)3 formula (I)
• wherein
• X is —NH2;
• —SH;
• —OH;
• —N═C═O;
• or —NRH where R is selected from the group consisting of phenyl, straight and branched aliphatic, alicyclic, and aliphatic ester groups;
• R1 is an alkylene, heteroalkylene, aralkylene, or heteroaralkylene group;
• and
• each Y is independently a hydroxyl;
• a hydrolyzable moiety selected from the group consisting of alkoxy, acyloxy, heteroalkyoxy, heteroacyloxy, halo, and oxime;
• or a non-hydrolyzable moiety selected from the group consisting of phenyl, alicyclic, straight-chain aliphatic, and branched-chain aliphatic, wherein at least one Y is a hydrolyzable moiety;
• and
• optionally (e) one or more water-solubilizing compounds comprising one or more water-solubilizing groups and at least one
• isocyanate-reactive hydrogen containing group,
• wherein the one or more surfaces of the substrate is coated with the cured coating.

A method for imparting stain-release characteristics to a substrate, having one or more surfaces, comprising the steps of:

• (a) applying a coating composition onto the one of more surfaces of the substrate, wherein the coating composition comprises:
• (i) at least one solvent;
• and
• (ii) one or more urethane oligomers of at least two repeating units selected from the group consisting of fluorine-containing urethane oligomers and long-chain hydrocarbon-containing urethane oligomers, wherein said oligomers comprise the reaction product of:
• (aa) one or more polyfunctional isocyanate compounds;
• (bb) one or more polyols;
• (cc) one or more monoalcohols selected from the group consisting of fluorocarbon monoalcohols, optionally substituted long-chain hydrocarbon monoalcohols, and mixtures thereof;
• and
• (dd) one or more silanes of the following formula (I):
• X—R1—Si—(Y)3 formula(I)
• wherein:
• X is —NH2;
• —SH;
• —OH;
• —N═C═O;
• or —NRH where R is selected from the group consisting of phenyl, straight and branched aliphatic, alicyclic, and aliphatic ester groups;
• R1 is an alkylene, heteroalkylene, aralkylene, or heteroaralkylene group;
• and
• each Y is independently a hydroxyl;
• a hydrolyzable moiety selected from the group consisting of alkoxy, acyloxy, heteroalkyoxy, heteroacyloxy, halo, and oxime;
• or a non-hydrolyzable moiety selected from the group consisting of phenyl, alicyclic, straight-chain aliphatic, and branched-chain aliphatic, wherein at least one Y is a hydrolyzable moiety;
• and
• optionally (ee) one or more water-solubilizing compounds comprising one or more water-solubilizing groups and at least one isocyanate-reactive hydrogen containing group.
• (b) allowing the coating composition to cure.