Magnesium hydroxide having fine, plate-like crystalline structur

Details Magnesium hydroxide having fine, plate-like crystalline structur Magnesium hydroxide having fine, plate-like crystalline structur

1990-12-26

1992-09-01

Langel, Wayne

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...

106461, 423274, 423635, 423636, 423638, 423639, C09C 102, C01F 508, C08K 310

Patent

active

051439654

ABSTRACT:
Novel magnesium hydroxide having a fine, plate-like crystalline structure, a median particle size of up to about 1 micron and a particle size distribution in which about 90% of said magnesium hydroxide particles are less than about 3.5 microns is prepared by a flash precipitation process in which less than or greater than an equivalent amount of alkaline material is reacted with a magnesium salt in a concentrated aqueous mixture thereof. Ultrasonic mixing means is used to combine heated aqueous streams of an alkaline material and a magnesium containing solution followed by a post heat treatment. The magnesium hydroxide is especially useful in providing flame retardancy in admixture with thermoplastic resins.

REFERENCES:
patent: 2940831 (1960-06-01), Nossardi et al.
patent: 3739058 (1973-06-01), Periard
patent: 4098762 (1978-07-01), Miyata et al.
patent: 4695445 (1987-09-01), Nakaya et al.

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