申请人:Shiratani Hiroshi
公开号:US20140065337A1
公开(公告)日:2014-03-06
A process for producing particles, the process including pulverizing particles of a compound represented by formula (I) with a median diameter (50% D) of over 100 μm by using a pulverizer in the presence of at least one member selected from the group consisting of silica, talc and clay, to obtain particles of the compound represented by formula (I) with a median diameter (50% D) of 100 μm or less,
in formula (I), R
1
and R
2
each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or alternatively, R
1
and R
2
are inked to each other to form a ring together with the nitrogen atom to which they are bound, m represents an integer of 2 to 9, M
n+
represents H
+
or an n-valent metal ion, and n represents an integer of 1 or 2.