Particulate magnesium hydroxide
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United States of America Patent
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Oct 24, 1995
Grant Date -
N/A
app pub date -
Apr 23, 1993
filing date -
Apr 23, 1992
priority date (Note) -
Expired
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Abstract
The invention relates to particulate magnesium hydroxide suitable for use as a flame retardant additive for a polymer which has a BET surface area of 13-30 m.sup.2 /g and an average particle size (D.sub.50) of 0.3-1.0 micron. The invention also relates to a process for producing a particulate magnesium hydroxide having a BET surface area of 13-30 m.sup.2 /g and an average particle size (D.sub.50) of 0.3-1.9 micron by calcining a magnesium feedstock to magnesium oxide having a BET surface area of 3-10 m.sup.2 /g; hydrating the magnesium oxide to a magnesium hydroxide hydration product in the absence of added catalyst; and milling the magnesium hydroxide hydration product. The invention further relates to a polymeric article containing particulate magnesium hydroxide according to the invention.
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