Patent ID: 6171688
Filing Date: 2001-01-09
Classification: C08J,Y10T

Abstract:
A composite material which comprises in admixture:(a) wood flour having a particle size between about 50 and 400 microns;(b) dried natural fibers having a width in a narrow dimension of between 40 and 60 microns and a length between about 0.6 and 2.5 cm;(c) hollow first microspheres of a polymer having a diameter between about 15 and 50 microns;(d) hollow second microspheres of glass having a diameter between about 50 and 200 microns which are larger than the polymer microspheres; and(e) a cured polymer matrix, wherein the weight ratio of wood flour and fibers to first and second microspheres is between about 10 to 1 and 1 to 10.