One component polyurethane dispersion for vinyl windows and other substrates

A coating comprising an aqueous polyurethane dispersion (PUD) comprising the reaction product of:

• (i) a polyisocyanate;
• (iii) a compound comprising at least one isocyanate-reactive group and an anionic group or potentially anionic group;
• (iv) an amorphous polyester having a glass transition temperature (Tg) as determined by differential scanning calorimetry (DSC) of less than −30° C. and comprising ortho-phthalic anhydride;
• (v) water;
• (vi) a mono functional polyalkylene ether;
• (vii) a polyol having a molecular weight of less than <400 g/mol, and
• (viii) a polyamine or amino alcohol having a molecular weight of 32 to 400 g/mol,
• wherein the aqueous polyurethane dispersion (PUD) has a glass transition temperature (Tg) as determined by differential scanning calorimetry (DSC) of 0° C. to 20° C. and a hard block content of greater than 50%,
• wherein the coating passes detergent resistance testing according to AAMA 615-13 with a minimum 90% gloss retention, a maximum color change of 5 delta E, with no blistering and no loss of adhesion after testing,
• wherein the coating exhibits no staining by betadine after four hours,
• wherein the coating passes humidity resistance testing according to ASTM D714 with no blistering and
• wherein the coating has a pencil hardness according to ASTM D3363 of at least 3H.