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New composite materials having a high density of small particles, such as hollow microspheres, in a matrix material are disclosed. The microspheres are densely packed in the matrix material such that adjacent microspheres are positioned in contact with each other or very close together. Fiber flank

New composite materials having a high density of small particles, such as hollow microspheres, in a matrix material are disclosed. The microspheres are densely packed in the matrix material such that adjacent microspheres are positioned in contact with each other or very close together. Fiber flanking may be provided on the opposite sides of a layer of a core of composite material having the small particles and matrix material. Also disclosed are methods of making and using the composite materials.

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The invention is claimed as: 1. A composite material comprising: a cross-linked polymeric material which is generally indispersible in water, and a plurality of microsphere particles in the polymeric material, the microsphere particles ranging from about 69% by volume to about 85% by volume of the

The invention is claimed as: 1. A composite material comprising: a cross-linked polymeric material which is generally indispersible in water, and a plurality of microsphere particles in the polymeric material, the microsphere particles ranging from about 69% by volume to about 85% by volume of the composite material and consisting essentially of diameters ranging from about 1 micron to about 350 microns; wherein the composite material is substantially free of voids in the polymeric material between the microsphere particles. 2. The composite material of claim 1, wherein the plurality of particles range from about 69% by volume to about 81% by volume of the composite material. 3. The composite material of claim 1, wherein the plurality of particles comprise about 75% by volume to about 85% by volume of the composite material. 4. The composite material of any one of claims 1- 3, wherein the plurality of particles comprise at least a plurality of first particles and a plurality of second particles having different sizes compared to each other. 5. The composite material of any one of claims 1- 3, wherein the plurality of microsphere particles are hollow microspheres. 6. The composite material of claim 5, wherein the hollow microspheres comprises at least two different sized microspheres. 7. The composite material of any one of claims 1- 3, wherein substantially any given distance between adjacent microsphere particles is less than a diameter of the smallest microsphere particle. 8. The composite material of any one of claims 1- 3, wherein substantially all of the plurality of particles are in contact with adjacent particles. 9. The composite material of any one of claims 1- 3, wherein the particles are selected from the group consisting of ceramic particles, glass particles, plastic particles, and combinations thereof. 10. The composite material of any one of claims 1- 2, wherein the polymeric material is selected from group consisting of epoxies, polyesters, vinyl esters, phenolics, thermoplastics, thermosets, polyurethanes, glues, cements, matrix material binders, and combinations thereof. 11. The composite material of any one of claims 1- 3, further comprising at least one layer of material in contact with the polymeric material having the particles. 12. The composite material of claim 11, wherein the at least one layer is selected from the group consisting of carbon fibers, glass fibers, uni-directional fibers, cross woven fibers, matte fiber, fiber braid, uni-directional stitch woven carbon fiber braid, plastics, leathers, foils, metals, laminates, composites, thermoplastics, thermoset materials, resins, ceramics, vinyls, rigid materials, flexible materials, flanking materials, and combinations thereof. 13. The composite material of any one of claims 1- 3, wherein the composite material has a specific gravity of from about 0.38 to about 2.2. 14. The composite material of any one of claims 1- 3, wherein the composite material has a specific gravity of less than 1.0. 15. A composite material comprising: a non-water-dispersible cross-linked polymeric material from about 15% by volume to about 31% by volume; and microspheres from about 69% by volume to about 85% by volume, substantially all of the microspheres having diameters ranging from about 1 micron to about 350 microns; wherein the composite material is substantially free of gas space in the polymeric material between the microspheres. 16. The composite material of claim 15, wherein the polymeric material is from about 19% by volume to about 31% by volume, and the microspheres are from about 69% by volume to about 81% by volume. 17. The composite material of claim 16, wherein the polymeric material is about 25% by volume, and the microspheres are about 75% by volume. 18. A composite material comprising a water non-dispersible cross-linked resin matrix binder material and microspheres, the microspheres having a volume of about 75% to about 85% of a volume of the matrix binder material combined with the microspheres and consisting essentially of diameters ranging from about 1 micron to about 350 microns; wherein the matrix binder material is substantially free of voids between the microspheres. 19. A composite material comprising: a core having a cross-linked polymeric material from about 15% to about 25% by volume of the core and which is generally indispersible in water, and microspheres from about 75% to about 85% by volume of the core, substantially all of the microspheres having diameters ranging from about 1 micron to about 350 microns; and a flanking layer bonded to the core; wherein the polymeric material is substantially free of voids between the microspheres. 20. The composite material of claim 19, wherein the core has flanking layers bonded to opposite sides of the core. 21. The composite material of claim 19, wherein the flanking layer substantially surrounds the core. 22. The composite material of claim 19, wherein the flanking layer is selected from the group consisting of carbon fibers, glass fibers, uni-directional fibers, cross woven fibers, matte fibers, fiber braid, uni-directional stitch woven carbon fiber braid, plastics, leathers, foils, metals, composites, thermoplastics, thermoset materials, resins, ceramics, vinyls, rigid materials, flexible materials, and combinations thereof. 23. The composite material of claim 1, wherein the microsphere particles consist essentially of diameters ranging from about 15 microns to about 120 microns. 24. The composite material of claim 23, wherein a substantial amount of the microsphere particles have about the same diameter. 25. The composite material of claim 15, wherein substantially all of the microspheres have diameters ranging from about 15 microns to about 120 microns. 26. The composite material of claim 25, wherein a substantial amount of the microspheres have about the same diameter. 27. The composite material of claim 18, wherein the microspheres consist essentially of diameters ranging from about 15 microns to about 120 microns. 28. The composite material of claim 27, wherein a substantial amount of the microspheres have about the same diameter. 29. The composite material of claim 19, wherein substantially all of the microspheres have diameters ranging from about 15 microns to about 120 microns. 30. The composite material of claim 29, wherein a substantial amount of the microspheres have about the same diameter. 31. The composite material of claim 1, further comprising a component selected from the group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors, thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof. 32. The composite material of claim 15, further comprising a component selected from the group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors, thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof. 33. The composite material of claim 18, further comprising a component selected from the group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors, thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof. 34. The composite material of claim 19, further comprising a component selected from the group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors, thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof. 35. A composite material comprising a water non-dispersible cross-linked resin matrix binder material and microspheres, the microspheres having a volume of about 69% to about 85% of a volume of the matrix binder material combined with the microspheres and consisting essentially of diameters ranging from about 1 micron to about 350 microns; wherein the matrix binder material is substantially free of voids between the microspheres. 36. A composite material comprising: a core having a cross-linked polymeric material from about 15% to about 31% by volume of the core and which is generally indispersible in water, and microspheres from about 69% to about 85% by volume of the core, substantially all of the microspheres having diameters ranging from about 1 micron to about 350 microns; and a flanking layer bonded to the core; wherein the polymeric material is substantially free of voids between the microspheres. 37. The composite material of claim 36, wherein the core has flanking layers bonded to opposite sides of the core. 38. The composite material of claim 36, wherein the flanking layer substantially surrounds the core. 39. The composite material of claim 36, wherein the flanking layer is selected from the group consisting of carbon fibers, glass fibers, uni-directional fibers, cross woven fibers, matte fibers, fiber braid, uni-directional stitch woven carbon fiber braid, plastics, leathers, foils, metals, composites, thermoplastics, thermoset materials, resins, ceramics, vinyls, rigid materials, flexible materials, and combinations thereof. 40. The composite material of claim 36, wherein substantially all of the microspheres have diameters ranging from about 15 microns to about 120 microns. 41. The composite material of claim 40, wherein a substantial amount of the microspheres have about the same diameter. 42. The composite material of claim 36, further comprising a component selected from the group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors, thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof. 43. The composite material of claim 35, wherein a substantial amount of the microspheres have about the same diameter. 44. The composite material of claim 35, further comprising a component selected from We group consisting of calcium carbonate, barium sulfate, fillers, zinc stearate, mold releasing agents, degassing agents, additives, inhibitors,-thixotropes, thickening agents, resin curing agents, accelerators, promoters, catalysts, cross-linking agents, and combinations thereof.