U.S.8,138,249 B2
BASF Coatings Japan Ltd.has been awarded a patent for a two-component coating system comprised of a component(a)comprised of one or more polyisocyanates,a component(b)comprised of one or more oligomeric and/or polymeric compounds that are reactive with component(a),which component(b)has an acid number of up to 30 mg KOH/g,wherein component(b)is comprised of at least one member selected from the group consisting of a polyester having at least two hydroxyl groups or a poly(meth)acrylate having at least two hydroxyl groups;and a component(c)comprised of one or more phosphonates selected from the group consisting of phosphonic diesters and diphosphonic diesters.Where(i)component(b)contains all oligomeric and/or polymeric compounds that are present in the two-component coating system and are reactive with component(a)and(ii)component(b)contains not more than 15%by weight,based on the total weight of component(b),of oligomeric and/or polymeric compounds which carry isocyanate-reactive amino groups;wherein component(c)is capable of reacting with moisture to suppress secondary reactions of polyisocyanates with condensation that give rise to unwanted gelling.
