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US7846994: Inorganic microspheres

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Filing Information

Inventor(s) Larry Royer · Michael Meshey · Ufuk Senturk ·
Assignee(s) Potters Industries, Inc. ·
Attorney/Agent(s) Buchanan Ingersoll & Rooney PC ·
Primary Examiner Edward J Cain ·
Application Number US12342260
Filing date 12/23/2008
Issue date 12/07/2010
Prior Publication Data
Predicted expiration date 02/02/2029
Patent term adjustment 41
U.S. Classifications 523/223  · 106/467  · 106/409  ·
International Classifications C08K716  ·
Kind CodeB2
19 Claims, 1 Drawings


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.

Independent Claims | See all claims (19)

  1. 1. Substantially solid inorganic microspheres produced from crystals of a synthetic zeolite having a d50 value from 1 to 50 microns.
  2. 16. 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.
  3. 17. 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.

References Cited

U.S. Patent Documents

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US1175224 Bleecker Mar 1916
US1995803 RESEARCH CORP Gilbert Mar 1935
US2044680 RESEARCH CORP Gilbert Jun 1936
US2334578 POTTERS RUDOLF H Potters Nov 1943
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Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
WO200020345PQ HOLDING, INC.Apr 2000

Other Publications

Product Information Bulletin entitled “Potters Europe Engineered Glass Materials Division,” publication date unknown (downloaded from www.potterseurope.org).
Product Information Bulletin entitled “Potters Europe Engineered Glass Materials Division,” publication date unknown (downloaded from www.potterseurope.org), (Mar. 2003).

Referenced By

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