SILVER FINE PARTICLES AND PROCESSES AND EQUIPMENT FOR THE PRODUCTION THEREOF

Title:

SILVER FINE PARTICLES AND PROCESSES AND EQUIPMENT FOR THE PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2008/013274

Kind Code:

A1

Abstract:

A process for production of silver fine particles which is characterized by making an aqueous silver ammine complex solution and a reducing agent solution meet each other in an open space to reduce the silver ammine complex and deposit silver fine particles, either in which the meeting is conducted by (i) a method of spraying an aqueous silver ammine complex solution and a reducing agent solution through nozzles or (ii) a method of ejecting an aqueous silver ammine complex solution and a reducing agent solution from obliquely downward nozzles opposite to each other to thereby produce silver fine particles which are free form coarse particles having particle sizes of 5μm or above and have a mean particle size of primary particles of 0.08 to 1.0μm and crystallite sizes of 20 to 150nm or in which an aqueous silver ammine complex solution having a silver concentration of 20 to 180g/L and an organic reducing agent solution having a reducing agent concentration of about 0.6 to about 1.4 times the silver concentration by reaction equivalent are used to thereby stably produce silver fine particles having a mean particle size of primary particles of 0.05 to 1.0μm and crystallite sizes of 20 to 150nm.

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Inventors:

KUBA KANJI (JP)
HIGAMI AKIHIRO (JP)
UNO TAKAHIRO (JP)

Application Number:

PCT/JP2007/064793

Publication Date:

January 31, 2008

Filing Date:

July 27, 2007

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)
KUBA KANJI (JP)
HIGAMI AKIHIRO (JP)
UNO TAKAHIRO (JP)

International Classes:

B22F1/00; B22F9/24; H01B13/00

Foreign References:

JP2006183072A	2006-07-13
JP2006077252A	2006-03-23
JP2006075708A	2006-03-23
JP2004124133A	2004-04-22
JPH0459904A	1992-02-26
JPH05156326A	1993-06-22

Attorney, Agent or Firm:

SHIGA, Masatake et al. (Yaesu Chuo-k, Tokyo 53, JP)

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