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US 5,461,101 AGranted
Particulate magnesium hydroxide
AssigneeDefped Limited
InventorsRoger N. Rothon, Adrian M. Ryder, Anthony G. Bourke
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AssigneeDefped Limited
InventorsRoger N. Rothon, Adrian M. Ryder, Anthony G. Bourke
Estimating the term…
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.
A flame retardant additive for a polymer, comprising:
A process for producing a flame retardant additive for a polymer, comprising the steps of:
A polymeric article containing a flame retardant additive comprising a particulate magnesium hydroxide produced by a process comprising the steps of:
Dependencies are inferred from the claim text.