| 摘要 |
PCT No. PCT/GB96/01475 Sec. 371 Date Mar. 19, 1998 Sec. 102(e) Date Mar. 19, 1998 PCT Filed Jun. 20, 1996 PCT Pub. No. WO97/00909 PCT Pub. Date Jan. 9, 1997A process for the preparation of a fire-retardant material which comprises a particulate inorganic filler (other than a tin compound) coated with a layer of divalent metal hydroxystannate or a divalent metal stannate, which process comprises the steps of: (i) forming a slurry of the particulate inorganic filler in an aqueous solution of an alkali hydroxystannate, also containing a divalent metal oxide dissolved therein; (ii) reacting the slurry from step (i) with a hydrolysing agent, or a water-soluble source of a divalent metal, to form a layer of a divalent metal hydroxystannate on the surface of the filler, and (iii) optionally, heating the filler coat with hydroxystannate in step (ii) in order to convert it to the corresponding divalent metal stannate.
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