White conductive powder, a process for its production and a resi

Details White conductive powder, a process for its production and a resi White conductive powder, a process for its production and a resi

1996-07-23

1998-12-29

Buffalow, E. Rollins

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428403, 428323, 4273831, 4273833, 4273973, 4274192, 521432, 521847, B32B 516

Patent

active

058538879

ABSTRACT:
The improved white conductive powder comprises white inorganic pigment particles the surfaces of which are coated with an electrically conductive layer of a dual structure consisting of a lower tin dioxide sub-layer and an upper tin dioxide-containing indium oxide sub-layer. To produce the powder, the hydration product of tin is deposited uniformly on the surfaces of white inorganic particles and, subsequently, an overcoat of indium oxide hydrate containing 0.1-20 wt % of tin dioxide is formed, followed by a heat treatment that is conducted at 350.degree.-750.degree. C. in a non-oxidizing atmosphere.
A resin composition containing this powder retains both the good conduction properties of a white conductive resin composition incorporating a conductive powder the particles of which are coated with antimony-doped tin dioxide and the high photostability of a white conductive resin composition incorporating an aluminum-doped conductive zinc oxide powder and yet the composition has a much higher degree of whiteness than either prior art resin composition.

REFERENCES:
patent: 3969217 (1976-07-01), Bommarajs et al.
patent: 4246143 (1981-01-01), Sonada et al.
patent: 4457973 (1984-07-01), Matsui et al.

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