Treatment of magnesium hydroxide and its use as plastics filler
AssigneeAlcan International Limited
InventorsStephen C. Brown, Frederick H. Taylor, Natalie G. Mead
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Abstract
Improved fire retardant fillers for plastics materials are described which consist of magnesium hydroxide particles of reduced average surface area. The particles are produced by contacting particles of magnesium hydroxide of a relatively high average surface area with an etching solution for a time sufficient to dissolve at least some of the particles and to leave particles of reduced average surface area.
Claims9
A method of producing magnesium hydroxide particles of reduced average surface area for use as a fire retardant filler material, which method comprises contacting particles of magnesium hydroxide of a relatively high average surface area with an etching solution for a time sufficient to dissolve at least some of the particles and to leave particles of reduced average surface area, and thereafter introducing said particles of reduced average surface area into a plastics material.
A method of producing magnesium hydroxide particles of reduced average surface area which method comprises contacting particles of magnesium hydroxide of a relatively high average surface area with an etching solution for a time sufficient to dissolve at least some of the particles and to leave particles of reduced average surface area, and thereafter treating said particles of reduced average surface area to remove said etching solution without destroying said particles of reduced average surface area.
Dependencies are inferred from the claim text.