Silver-coated particle and method of producing same
AssigneeMitsubishi Materials Corporation
InventorsHiroto Akaike, Kazuhiko Yamasaki
Life of this patent
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Abstract
A silver-coated particle (P1) is provided. The silver-coated particle (P1) includes a core particle (2) made of a resin particle or an inorganic particle and a silver coating layer (1) formed on a surface of the core particle (2), wherein, an amount of silver contained in the silver coating layer (1) is 5 to 90 parts by mass with respect to 100 parts of the silver-coated particle (P1), a crystallite diameter of the silver, which is calculated from a diffraction line obtained by filling a sample holder belonging to an X-ray diffraction apparatus with the silver-coated particle (P1); and irradiating X-ray in a range of 2θ/θ=30 to 120 deg., is in a range of 35 nm to 200 nm.
Claims9
A silver-coated particle comprising a core particle made of a resin particle or an inorganic particle and a silver coating layer formed on a surface of the core particle by electroless silver plating, wherein,
- an amount of silver contained in the silver coating layer is 25 to 80 parts by mass with respect to 100 parts of the silver-coated particle,
- a crystallite diameter of the silver, which is calculated from a diffraction line obtained by filling a sample holder belonging to an X-ray diffraction apparatus with the silver-coated particle;
- and irradiating X-ray in a range of 2θ/θ=30 to 120 deg., is in a range of 35 nm to 200 nm,
- the crystallite diameter of the silver is smaller than an average film thickness of the silver coating layer.
A method of producing a silver-coated particle comprising the steps of:
- forming a tin absorbing layer on a surface of a core particle at a temperature of 25 to 45° C., for 0.5 to 24 hours by adding the core particle made of a resin particle or an inorganic particle to an aqueous solution of a tin compound;
- preparing a silver-coated particle precursor, which contains a silver coating layer on the surface of the core particle, by performing electroless plating on the tin absorbing layer, which is formed on the surface of the core particle, by using a reducing agent;
- and
- setting a crystallite diameter of the silver, which is measured by X-ray diffraction method, to 35 nm to 200 nm by sintering silver constituting the silver coating layer by heat treating the silver-coated particle precursor at:
- a temperature of 100° C. or more and less than 250° C. in an air after water-washing and drying the silver-coated particle precursor;
- or a temperature of 100° C. or more and less than 250° C. in water immediately after water-washing the silver-coated particle precursor, for 0.5 to 10 hours.
Dependencies are inferred from the claim text.