Hollow porous microspheres made from dispersed particle compositions

Hollow porous microspheres having essentially the same diameter within the range of 1200 to 6000 microns and having essentially the same wall thickness within the range of 10 to 200 microns, the walls of said hollow microspheres comprise sintered together particles which define interconnecting voids within the walls and a single central cavity in the interior of the microspheres and inner and outer microsphere wall surfaces, said interconnecting voids are continuous and extend from the outer wall surface to the inner wall surface, said walls have essentially uniform void content and said interconnecting voids are essentially uniformly distributed in the walls of the hollow microspheres, and the walls of said hollow microspheres are free of latent solid or liquid blowing gas materials and are essentially free of relatively thinned wall portions and bubbles.

Hollow microspheres having essentially the same diameter within the range of 500 to 6000 microns and having essentially the same wall thickness within the range of 5 to 400 microns, the walls of said hollow microspheres comprise sintered together particles which define voids within the walls and a single central cavity in the interior of the microspheres and inner and outer microsphere wall surfaces, said voids extend from the outer wall to the inner wall, said walls have essentially uniform void content and said voids are essentially uniformly distributed in the walls of the hollow microspheres, and the walls of said hollow microspheres are free of latent solid or liquid blowing gas material and are essentially free of relatively thinned wall portions and bubbles, wherein the sintered together particles defining the voids have been sintered or fused to close and seal the voids.

Hollow porous microspheres having essentially the same diameter within the range of 500 to 6,000 microns and having essentially the same wall thickness within the range of 5.0 to 400 microns, the walls of said hollow microspheres comprise sintered together particles, said sintered together particles being selected from the group consisting of plastic polymeric and resin material particles, which define interconnecting voids within the walls and a single central cavity in the interior of the microspheres and inner and outer microsphere walls surfaces, said interconnecting voids are continuous and extend from the outer wall surface to the inner wall surface, said walls have essentially uniform void content and said interconnecting voids are essentially uniformly distributed in the walls of the hollow microspheres, and the walls of said hollow microspheres are free of latent solid or liquid blowing gas materials and are essentially free of relatively thinned wall portions and bubbles.

Hollow microspheres having essentially the same diameter within the range of 500 to 6000 microns and having essentially the same wall thickness within the range of 5 to 400 microns, the walls of said hollow microspheres comprise sintered together particles, said sintered together particles being selected from the group consisting of plastic polymeric and resin material, which define voids within the walls and a single central cavity in the interior of the microspheres and inner and outer microsphere wall surfaces, said voids extend from the outer wall to the inner wall, said walls have essentially uniform void content and said voids are essentially uniformly distributed in the walls of the hollow microspheres, and the walls of said hollow microspheres are free of latent solid or liquid blowing gas material and are essentially free of relatively thinned wall portions and bubbles, wherein the sintered together particles defining the voids have been sintered or fused to close and seal the voids.