Inorganic microspheres
AssigneePotters Industries, Inc.
InventorsLarry Royer, Michael Meshey, Ufuk Senturk
Life of this patent
Estimating the term…
Abstract
This invention relates to inorganic microspheres having a relatively narrow particle size distribution, which may be prepared by spheridization of zeolite crystals. The microspheres are particularly useful for whitening polymer compositions and in other filler applications.
Claims20
Substantially solid inorganic microspheres having a d50 value from 1 to 50 microns.
Substantially solid inorganic microspheres having a d50 value from 1 to 50 microns and a size distribution ratio (d90−d10)/d50 from 0.5 to 2, wherein said inorganic microspheres have been produced from crystals of a synthetic zeolite, provide a Hunter L value of at least 80 when incorporated at a 20 weight percent level in a cured polyester composite, and have a true density of at least 1.9 g/cm3 and wherein a portion of said inorganic microspheres are at least partially crystalline and a portion of said inorganic microspheres are fully amorphous or partially amorphous.
Substantially solid inorganic microspheres having a d50 value from 3 to 10 microns and a size distribution ratio (d90−d10)/d50 from 0.6 to 1.5, wherein said inorganic microspheres have been produced from crystals of a synthetic zeolite, provide a Hunter L value of at least 85 when incorporated at a 20 weight percent level in a cured polyester composite, are comprised of greater than 25 weight % Al2O3, and have a true density of at least 1.9 g/cm3 and wherein a portion of said inorganic microspheres are at least partially crystalline and a portion of said inorganic microspheres are fully amorphous or partially amorphous.
Dependencies are inferred from the claim text.