Method for the production of fillers and flame retardants based on gibbsite and application in plastics
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United States of America Patent
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Mar 31, 1992
Grant Date -
N/A
app pub date -
Feb 13, 1989
filing date -
Feb 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process is disclosed for producing aluminum hydroxide in the form of gibbsite in particular shapes, suitable for use as a filler, flame retardant and/or fibrous reinforcement. The process includes the steps of crystallizing gibbsite from a Bayer process sodium aluminate liquor, in the presence of an additive comprising either a hydroxycarboxilic acid for producing needle shaped, rod-like hydrargillite or in the presence of a polyalcohol, fatty acid or lithium compound for producing platy or tabular gibbsite.
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