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Filled polyurethane composites with lightweight fillers

  • US 10,030,126 B2
  • Filed: 06/05/2015
  • Issued: 07/24/2018
  • Est. Priority Date: 06/05/2015
  • Status: Active Grant
First Claim
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1. A composite comprising:

  • (a) a polyurethane formed by the reaction of(i) one or more isocyanates selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, and(ii) one or more polyols;

    (b) from 35% to 75% by weight, based on the total weight of the composite, of a particulate filler having a bulk density of 1 g/cm3 or greater; and

    (c) from 4% to 20% by weight, based on the total weight of the composite, of a lightweight filler having a bulk density of from 0.01 g/cm3 to less than 1 g/cm3, wherein the lightweight filler is chosen from expanded volcanic ash, expanded perlite, pumicite, expanded vermiculite, expanded clay, foamed glass, soybean hulls, rice hulls, seeds, seed husks, chopped straw, expanded polystyrene beads, scoria, and combinations thereof;

    wherein the composite has a density of from 2 lb/ft3 to 37 lb/ft3; and

    wherein the composite has flexural strength of 1000 psi or greater as measured by ASTM C1185-08 (2012).

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