Patent ID: 7304105
Filing Date: 2007-12-04
Classification: C08K,C08L,F42B

Abstract:
1. A composite material having a density of at least 10 g/cm 3 , comprising an elastomer or vulcanized rubber, and high-density particles dispersed over said elastomer or vulcanized rubber, wherein said clastomer or vulcanized rubber and said high-density particles are contained, respectively, at 35 to 50 volume % and 50 to 65 volume % with respect to the total volume of said composite material, and said high-density particles made of tungsten (W) and comprising: 60 to 80 volume % of first particles cach having a particle size in the range of 10 to 100 μm; 10 to 20 volume % of second particles each having a particle size in the range of 3 to 6 μm; and 10 to 20 volume % of third particles each having a particle size in the range of 1 to 2 μm, wherein said second and third particles are packed in respective spaces between said first particles, and wherein said elastomer or vulcanized rubber forms a network around said packed particles while maintaining its elasticity and extensibility to keep up the flexibility of said composite material.