Agglomerate and resin composition containing the same

An agglomerate comprising fine primary particles of an inorganic compound except for silica, the agglomerate satisfying the following expressions (a) to (e):

• 0.5≦dp50≦20[μm] (a)
• 0≦α≦2.5 [″] (b)
• 30≦Sw [m2/g] (c)
• 20≦St≦150[MPa] (d) and
• 200≦Sta≦600[MPa] (e),
• wherein
• dp50:
• the average particle diameter [μm] of the agglomerate measured by Microtrac-FRA, a laser analysis type particle size distribution measurement apparatus,
• α:
• the value calculated by dividing the difference between the particle diameter d90 of cumulative 90% minus sieve particles of the agglomerate and the particle diameter d10 of cumulative 10% minus sieve particles of the agglomerate calculated by the Microtrac-FRA, a laser analysis type particle size distribution measurement apparatus by the average particle diameter dp50 according to the following equation:
• α=(d90−d10)/dp50,
• d90:
• the particle diameter of cumulative 90% minus sieve particles of the agglomerate measured by the Microtrac-FRA, a laser analysis type particle size distribution measurement apparatus,
• d10:
• the particle diameter of cumulative 10% minus sieve particles of the agglomerate measured by the Microtrac-FRA, a laser analysis type particle size distribution measurement apparatus,
• Sw:
• the BET specific surface area of the agglomerate [m2/g],
• St:
• the tensile strength [MPa] required to break the agglomerate with the particle diameter 4 μm, measured by a micro compression testing machine manufactured by Shimadzu Corporation, and
• Sta:
• the tensile strength [MPa] required to break 30% of the particle diameter of the agglomerate with the particle diameter 4 μm, measured by a micro compression testing machine manufactured by Shimadzu Corporation.