Loading patent…
AssigneeTitan Kogo Kabushiki Kaisha
InventorsAkihiro Yoshimoto, Toshihiro Yoshinaga, Shigeru Nagaoka, Masayasu Morishita
Estimating the term…
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.
A white conductive powder comprising white inorganic pigment particles the surfaces of which are coated with an electrically conductive coating consisting of a lower layer and an upper layer wherein said lower layer consists essentially of tin dioxide and accounts for 0.5-50 wt % on the basis of the pigment, and wherein said upper layer contains 0.1-20 wt % of tin dioxide on the basis of In.sub.2 O.sub.3, with the balance consisting essentially of indium oxide, and accounts for 5-200 wt % on the basis of the pigment.
A process for producing a white conductive powder comprising white inorganic pigment particles the surfaces of which particles are coated with an electrically conductive coating consisting of a lower layer and an upper layer wherein said lower layer consists essentially of tin dioxide and accounts for 0.5-50 wt % on the basis of the pigment, and wherein said upper layer contains 0.1-20 wt % of tin dioxide on the basis of In.sub.2 O.sub.3, with the balance consisting essentially of indium oxide, and accounts for 5-200 wt % on the basis of the pigment, which comprises the step of;
A conductive resin composition comprising a white conductive powder and a resin, said conductive powder comprising white inorganic pigment particles the surfaces of which are coated with an electrically conductive layer consisting of a lower layer and an upper layer wherein said lower layer consists essentially of tin dioxide and accounts for 0.5-50 wt % on the basis of the pigment, and wherein said upper layer contains 0.1-20 wt % of tin dioxide on the basis of In.sub.2 O.sub.3 with the balance consisting essentially of indium oxide, and accounts for 5-200 wt % on the basis of the pigment.
Dependencies are inferred from the claim text.