Patent ID: 8299136

Claim:
A polyurethane composite material comprising: a polyurethane formed by reaction of a reaction mixture of: one or more monomeric or oligomeric poly- or di-isocyanates; and a first polyol, which is a rigid polyol, having a first hydroxyl number in the range of about 320 mg KOH/g to about 600 mg KOH/g; and a second polyol having a second hydroxyl number, wherein the second hydroxyl number is at least about 20 mg KOH/g and is substantially less than the first hydroxyl number; wherein the first polyol and the second polyol are plant based polyester polyols; water in an amount that provides a composite material having a density of about 30 lbs/ft 3 to about 85 lbs/ft 3 ; wherein the mixture is substantially free of halogenated hydrocarbons; wherein the ratio of the first polyol to the second polyol is about 3 to about 20; about 40 to about 85 weight percent inorganic filler, wherein the inorganic filler comprises coal ash; and reinforcing fiber having a length in the range of 0.125 inches to about 1 inch.