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Polyurethane composite materials

  • US 9,512,288 B2
  • Filed: 02/14/2014
  • Issued: 12/06/2016
  • Est. Priority Date: 03/24/2006
  • Status: Active Grant
First Claim
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1. A polyurethane composite material comprising:

  • a polyurethane formed by reaction of a reaction mixture comprising;

    one or more monomeric or oligomeric poly- or di-isocyanates;

    a first polyol having a first hydroxyl number in the range of about 320 mg KOH/g to about 600 mg KOH/g and a functionality of from about 4 to about 8; and

    a second polyol having a second hydroxyl number, wherein the second hydroxyl number is at least about 70 mg KOH/g and is less than the first hydroxyl number, and a functionality of from about 2 to less than 3;

    wherein the average functionality of the first polyol and the second polyol is from about 2 to less than 3 and wherein the reaction mixture is provided with an isocyanate index of from about 0.5;

    1 to less than 1.5;

    1;

    about 60 to about 85 weight percent of an inorganic filler, based upon the weight of the composite material, wherein the inorganic filler comprises coal ash; and

    about 0.1 to about 10 weight percent of a reinforcing fiber based upon the weight of the composite material;

    wherein the second polyol is a polyester polyol.

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