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US 6,887,454 B1Granted
Process for the production of aluminium hydroxide
AssigneeAlbemarle Corporation
InventorsGenoveva Bilandzic, Neil Brown, Norbert Putz
Life of this patent
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Abstract
Gibbsite type aluminium hydroxides are obtained by seeding a Bayer liquor with bayerite crystals. The gibbsite type aluminium hydroxide show excellent properties as fire retardant fillers in synthetic resins.
Claims9
A process for the preparation of gibbsite type aluminum hydroxides comprising:
- seeding a liquor obtained from a Bayer process with bayerite crystals having a grain diameter in the 50% range (d50) of 1.2 μm to 2.2 μm.
A gibbsite type aluminium hydroxide having a grain diameter in the 50% range (d50) of 1.5 μm to 4.5 μm, in the 10% range (d10) of 0.4 μm to 2.0 μm and in the 90% range (d90) of 3.0 μm to 9.5 μm, a surface area (according to BET) from 1.0 m2/g to 4.0 m2/g and an aspect ratio from 4:1 to 6:1.
Dependencies are inferred from the claim text.