Water based, solvent free, two component aliphatic polyurethane coating

A polyester-polyol blend for use in preparing coating compositions comprising:

• (a) from 0.33 to 0.67 equivalents of a modified polyester-polyol said polyester-polyol being modified by being reacted with from 1 to 2% by weight of a trihydric polyol and from about 10-15% by weight of a polyfunctional diol containing a carboxylic acid group, said modified polyester-polyol having a molecular weight of between about 1000 to 2000, an equivalent weight of between about 750 to 850 and a hydroxyl number of between about 55 to 100;
• (b) 0.45 to 0.75 equivalents of a low viscosity polyol comprising a member selected from the group consisting of aliphatic polyether polyols and polyester-polyols and trihydric polyol modified polyester-polyols having an equivalent weight of between about 150 and 200 and an hydroxyl number of between about 300 and 350;
• (c) 0.33 to 0.67 equivalents of a low molecular weight chain extending diol or triol having from three to eight carbon atoms and having a equivalent weight of from about 30 to 60;
• (d) 0.15 to 0.33 equivalents of a float neutralizing amine selected from the group consisting of diethanol amine and triethanol amine and mixtures thereof;
• (e) 0.15 to 0.33 equivalents of a second neutralizing amine selected from the group consisting of 2-amino-2-methyl-1-propanol and tris(hydroxymethyl)aminomethane;
• and
• (f) 1-5% by weight of a nonreactive non-ionic detergent;
• said polyester-polyol blend having a solids content of between 90 and 100%, an equivalent weight of between about 165 to 365;
• an hydroxyl number of between about 180 to 300, an acid number of between about 10 and 50 and a viscosity of between about 600 to 1500 cps at. 25.degree. C.