Crystal nucleator for polyolefin resins, method for producing crystal nucleator for polyolefin resins, and method for improving fluidity of crystal nucleator for polyolefin resins

A method for producing a crystal nucleating agent for polyolefin resins, wherein the crystal nucleating agent (A) is a mixture of a crystal nucleating agent (B) having an average particle size of 0.5 to 2.0 μm as determined by laser diffraction particle size distribution measurement and a crystal nucleating agent (C) having an average particle size of 4.0 to 15.0 μm as determined by laser diffraction particle size distribution measurement, comprising:

• (i) pulverization with a jet pulverizer to an average particle size of 0.5 to 4.0 μm and a particle size uniformity of 3 to 10.

A method for improving the fluidity of a crystal nucleating agent for polyolefin resins, comprising:

• adjusting an average particle size of a crystal nucleating agent for polyolefin resins that contains a crystal nucleating agent (A) and a fluidity improver to 0.5 to 4 μm and a particle size uniformity of the crystal nucleating agent for polyolefin resins to 3 to 10;
• wherein the crystal nucleating agent (A) is a mixture of a crystal nucleating agent (B) having an average particle size of 0.5 to 2.0 μm as determined by laser diffraction particle size distribution measurement and a crystal nucleating agent (C) having an average particle size of 4.0 to 15.0 μm as determined by laser diffraction particle size distribution measurement and adjusting an aerated bulk density of the crystal nucleating agent for polyolefin resins to 0.20 g/cm3 or higher and a packed bulk density of the crystal nucleating agent for polyolefin resins to 0.30 g/cm3 or higher.