New polyester=poly:ol compsn for use in polyurethane paint

摘要

Polyester-polyols with OH nos. of 120-250 and acid nos. of 5-30 (A) comprise reaction prods. of (a) 5-50 mole% neopentyl glycol, (b) 10-45 mole% trimethylolpropane and (c) 40-52 mole% hexahydrophthalic anhydride. Also claimed are (i) reaction paints for the prodn. of coatings, produced by mixing (A) polyester-polyols as above, (B) opt. other polyhydroxy cpds., (C) polyisocyanate hardeners, (D) inert organic solvents and opt. (E) other normal additives; and (ii) a process for the prodn. of coatings or primer coats by applying the above compsns. to a substrate and hardening at room temp. or at temps. up to 120 deg.C.