Process for preparing hydrotalcite and brucite type posite...

Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing

Reexamination Certificate

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C423S115000, C423S122000, C423S158000

Reexamination Certificate

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07022302

ABSTRACT:
An improved process is described for the preparation of surface modified hydrotalcite. The process comprises reacting a precursor of magnesium and aluminium in the presence of suitable alkali carbonate at high temperature. The product has a BET surface area of ≦20 m2/gm and average particle size of ≦0.5 μm and is useful as halogen scavenger and fire retardant.

REFERENCES:
patent: 2257544 (1941-09-01), Clark
patent: 2002/0006375 (2002-01-01), Akira et al.
patent: WO 93 22237 (1993-11-01), None
patent: WO 02 079090 (2002-10-01), None
Patent Abstracts of Japan, vol. 010, No. 226, Aug. 7, 1986 & JP 61 063526 A, Apr. 1, 1986.
Database WPI, Section Ch, Week 199322, Derwent Publications Ltd., London, GB; Class E33, AN 1993-176262, XP002260918 & CZ 277548 B, Feb. 17, 1993.

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