Particulate magnesium hydroxide

Details Particulate magnesium hydroxide Particulate magnesium hydroxide

1993-04-23

1995-10-24

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

423635, 423636, C08K 322, C09C 102, C01F 508

Patent

active

054611016

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.

REFERENCES:
patent: 2658814 (1953-11-01), Woodward
patent: 4098762 (1978-07-01), Miyata
patent: 4505887 (1985-03-01), Miyata et al.
patent: 4698379 (1987-10-01), Nakaya et al.
patent: 5143965 (1992-09-01), Mertz
Abstract of Japan 1-245 039 Published Sep. 29, 1988.
Abstract of Japan 61-031446 Published Feb. 13, 1986.
Abstract of Japan 61-247746 Published Nov. 5, 1986.
Abstract of Japan 1-131022 Published May 23, 1989.
Abstract of Japan 2-048,414 Published Feb. 19, 1990.

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