Water dilutable leverler coating compositions

Claim 1

A leveler coating composition consisting essentially of water and dispersed materials selected from the group consisting of blocked polyisocyanates, diamines, water-dilutable melamine resin, water-dilutable polyester resin, water-dilutable polyacrylate resin, and water-dilutable polyurethane resin, all present in amounts effective to form a stable dispersion, said composition having a solids content of about 10-50% by weight, based on the total weight of the dispersion, and a viscosity of about 10-50,000 mPa.s; wherein at least about 9% by weight of the solids content based on the total weight of the composition if example 15 is the basis of said composition consists essentially of a water-dilutable polyurethane resin that is a product of chemical reaction of all the following components: (a) hydroxyl-terminated polyether polyols having a functionally of at least 3, a weight average molecular weight of about 1,000-20,000, and a chemical structure according to the general formula (R 1 ) y --R 2 --(R 3 ) Z , wherein R 1 is ##STR2## R 2 has a valence of x, x being one of the integers 3, 6, 9, 12, 15, or 18, and a formula selected from the group consisting of R 4 --C--(CH 2 O--) 3 , where R 4 is methyl or ethyl, and ##STR3## where q is an integer from 0 to 5, R 3 is ##STR4## z is 0 to 4; y is (x-z); a is 1 to 15; b is 20 to 100; c is 1 to 15; d is 20 to 150; e is 1 to 15; (a+c+e) is 3 to 40; (b+d) is 40 to 300; and (c+e) is 2 to 15; (b) polyols selected from the group consisting of (1) castor oil, (2) products formed by condensing castor oil with up to 50 moles of ethylene oxide per mole of castor oil, (3) products formed by condensing castor oil with up to 100 moles of propylene oxide per mole of castor oil, (4) products formed by epoxidizing naturally occurring fats or oils containing at least three carbon-carbon double bonds per molecule and then reacting the resulting products with alcohols to open epoxide rings, and (5) products formed by epoxidizing naturally occurring fats or oils containing at least three carbon-carbon double bonds per molecule, then reacting the resulting products with alcohols to open epoxide rings, and then condensing the resulting products with C 2-4 alkylene oxides; (c) dihydroxy or diamino ionizable anionic compounds; and (d) organic diisocyanates.