Kyushu University

Nissan Chemical Industries Limited

Nissan Chemical Corporation

Takashi Sue

Hideo Nagashima

Keisuke Odoi

Akihiro Tanaka

Keisuke Kojima

A complex that includes a metal fine particle dispersant including a branched polymer compound having an ammonium group and having a weight average molecular weight of 500 to 5,000,000; and a metal fine particle, wherein the metal fine particle includes platinum (Pt) or palladium (Pd), the metal fine particle dispersant includes a branched polymer compound of Formula (1): 

Metal fine particle dispersant containing branched polymer compound having ammonium group

There is provided a metal fine particle dispersant containing a branched polymer compound having an ammonium group. The metal fine particle dispersant of the present invention comprises a branched polymer compound having an ammonium group and having a weight average molecular weight of 500 to 5,000,000. The metal fine particle dispersant has the structure of Formula (1): The present invention also relates to a composition comprising the metal fine particle dispersant and a metal fine particle.

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Fukuoka, Japan

Takashi Sue