Patent ID: 8815976
Filing Date: 2014-08-26
Classification: B22C

Abstract:
1. A system for use in preparing a foundry mold, the system comprising: a) a polymerizable hydroxyl-containing component comprising lignite at a concentration of between about 5 and about 65% by weight of the system, and one or more polyols present in an amount between about 1 and about 60% by weight of the system; b) an isocyanate component comprising between about 10 and about 80% isocyanate, based on the weight of the system, and selected from the group consisting of consisting of 2,4- and 2,6-diisocyanatotoluene (TDI) and their derivatives, methylenediphenyl 4,4′-, 2,4- and 2,2′-diisocyanates (MDI) and their derivatives, polymeric MDI's (PMDI), 1,5-naphthalene diisocyanate (NDI), 4,4′,4″-triisocyanatotriphenylmethane and bis(3,5-diisocyanato-2-methylphenyl)methane, 1,6-hexamethylene diisocyanate (HDI), and 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl(isophorone) isocyanate (IPDI); and c) a catalyst component comprising a tertiary amine catalyst, the components adapted to be combined in order to form the polymer composition, wherein the hydroxyl groups that react in the polymerization of a) and b) consist of those provided by the component of a), the system excluding the presence of aggregate.