Hollow porous microspheres made from dispersed particle compositions

Hollow microspheres having a substantially uniform diameter within the range of 500 to 6000 microns and having a substantially uniform 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 glass, metal and metal glass 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 substantially uniform void content and said voids are substantially 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 substantially 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 a substantially uniform diameter within the range of 500 to 6,000 microns and having a substantially uniform wall thickness within the range of 5.0 to 400 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 substantially uniform void content and said interconnecting voids are substantially 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 substantially free of relatively thinned wall portions and bubbles, wherein there is contained in the interconnecting voids a rigid latticework of small solid particles such that the interconnecting voids contain a porous matrix of said small solid particles to form in the interconnecting voids micro pores defined by said rigid latticework of small particles.

Hollow porous microspheres having a substantially uniform diameter within the range of 500 to 6,000 microns and having a substantially uniform wall thickness within the range of 5.0 to 400 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 substantially uniform void content and said interconnecting voids are substantially 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 substantially free of relatively thinned wall portions and bubbles, and having placed in the interconnecting voids in the walls of the microspheres a selective semipermeable membrane such that the interior of the hollow microsphere is closed off from the exterior of the hollow microsphere.

Hollow porous microsphers having a substantially uniform diameter within the range of 500 to 6,000 microns and having a substantially uniform wall thickness within the range of 5.0 to 400 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 substantially uniform void content and said interconnecting voids are substantially 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 substantially free of relatively thinned wall portions and bubbles, and containing encapsulated therein an adsorbent or absorbent material.