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Abstract

A calcium carbonate filler for a resin, in which the content rate of particles having a particle diameter of 0.26 μm or less is 30% or less in a number particle size distribution diameter measured (Mac-VIEW manufactured by Mountech) from an electron micrograph, and which satisfies the following expressions (a) to (c) is provided.

description='In-line Formulae' end='lead'Dms5/Dmv5≦3  (a)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'1≦Sw≦8 (m²/g)  (b)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'Mo≦300 (ppm)  (c)description='In-line Formulae' end='tail'

wherein

Dms5: A 5% diameter (μm) accumulated from a small particle side in a volume particle size distribution by a laser diffraction particle size distribution measuring device (MASTERSIZER2000 manufactured by Malvern); Dmv5: A 5% diameter (μm) accumulated from a small particle side in a number particle size distribution in a particle diameter (Mac-VIEW manufactured by Mountech) measured with an electron microscope; Sw: A BET specific surface area (Macsorb manufactured by Mountech) (m²/g); Mo: A water amount (ppm) by the Karl Fischer method at 200 to 300° C.

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First Claim