Calcium carbonate filler for resin, method for producing the same, and resin composition containing the filler

摘要

In the number particle size distribution diameter measured from an electron micrograph (Macun-View, manufactured by Mountain Tech), the content of particles having a particle diameter of 0.26 μm or less is 30% or less, and the following formulas (a) to (c) A satisfactory calcium carbonate filler for resin is provided. (A) Dms5 / Dmv5 ≦ 3 (b) 1 ≦ Sw ≦ 8 (m 2 / g) (c) Mo ≦ 300 (ppm) Dms5: Volume particle size distribution by laser diffraction particle size distribution measuring device (MASTERSIZER2000 manufactured by Malvern) , 5% diameter (μm) accumulated from the small particle side; Dmv5: 5% diameter (μm) accumulated from the small particle side in the number particle size distribution in the particle diameter (Mountech's Mac-VIEW) measured with an electron microscope Sw: BET specific surface area (Macsorb manufactured by Mountaintech) (m2 / g); Mo: Moisture content (ppm) by the Karl Fischer method at 200 to 300 ° C. The calcium carbonate filler for resin of the present invention has a fine powder and is adjusted to a specific particle size, has low volatile components such as moisture, and solves problems such as foaming even when blended in a high concentration in a resin having a high processing temperature. The