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AssigneeMitsui Mining & Smelting Co., Ltd.
InventorTakao Hayashi
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A silver sol comprises silver particles having a particle size ranging from 1 to 100 nm and a silver solid content ranging from 1 to 80% by weight. The silver sol can be prepared by a method comprising the steps of reacting a solution of a silver compound with a reducing agent at a temperature ranging from 5 to 50.degree. C. and a stirring speed falling within the range of from 1,000 to 10,000 rpm to form silver fine particles; recovering the resulting silver fine particles using a centrifugal separator; and then dispersing the silver fine particles in a medium to give a silver sol having a silver solid content ranging from 1 to 80% by weight. The silver sol or a coating material obtained by diluting the sol to a desired silver solid content and, if desired, adding a binder permits the formation of a transparent conductive film on, for instance, a cathode-ray tube while reducing the production cost. The resulting transparent conductive film has high transparency suitably used for coating a cathode-ray tube, excellent conductivity, in particular, good electromagnetic shielding properties and a surface resistance of not more than 10.sup.3 .OMEGA./.quadrature..
A method for preparing a silver sol, comprising the steps of reacting a solution of a silver compound with a reducing agent at a temperature ranging from 5 to 50.degree. C. and a stirring speed falling within the range of from 1,000 to 10,000 rpm to form fine silver particles having a particle size ranging from 1 to 100 nm;
A method for preparing a silver sol, comprising the steps of reacting a solution of a silver compound with a reducing agent at a temperature ranging from 5 to 50.degree. C. and a stirring speed falling within the range of from 1,000 to 10,000 rpm, while the reaction temperature or the stirring speed being changed at least one time in the course of the reaction to thus form a mixture of fine silver particles having different particle sizes, the mixture having a particle size distribution such that the packing density of the silver particles ranges from 5 to 8 g/cm.sup.3, recovering the resulting fine silver particles using a centrifugal separator;
A method for preparing a silver sol, comprising the steps of reacting a solution of a silver compound with a reducing agent at a temperature ranging from 5 to 50.degree. C. and a stirring speed falling within the range of from 1,000 to 10,000 rpm to form fine silver particles and then recovering the fine particles using a centrifugal separator, repeating these steps a sufficient number of times to obtain fine silver particles having different particle sizes;
Dependencies are inferred from the claim text.