Patent ID: 6136888
Filing Date: 2000-10-24
Classification: B22C,C08G,C08L

Abstract:
A two-component polyurethane-based binder system for casting molding materials consisting essentially of:(a) a phenolic resin component consisting essentially of at least (i) one phenolic resin of the benzylic ether type exhibiting free phenolic and free alcoholic OH-groups and (ii) a solvent for the phenolic resin; and(b) a polyisocyanate component consisting essentially of (i) at least one polyisocyanate capable of reacting with said phenolic resin exhibiting free phenolic and free alcoholic OH-groups to form a resin therewith and (ii) a solvent for said polyisocyanate;wherein said solvent (b)(ii) for said polyisocyanate is comprised at least in part of a fatty acid methyl ester, wherein said fatty acid methyl ester is a methyl monoester of one or more fatty acids with a carbon chain of twelve or more carbon atoms, wherein high boiling aromatic hydrocarbon(s) make up the balance of said solvent, and wherein said solvent (b)(ii) for said polyisocyanate contains more fatty acid methyl ester than high-boiling aromatic hydrocarbon.