HEAVY CALCIUM CARBONATE, PRODUCTION METHOD THEREFOR, AND RESIN COMPOSITION CONTAINING SAID CALCIUM CARBONATE

A surface-treated heavy calcium carbonate is provided which is useful for a film exactly controlled in its pore diameter and for easily hydrolyzable polyester resins. A heavy calcium carbonate is also provided which is compounded in a curable resin such as a one-component moisture-curable adhesive and a sealant either without any pre-drying treatment or by simple pre-drying treatment. A surface-treated heavy calcium carbonate satisfying 13,000 A 25,000, 0.8 B 3.0, C 0.55, and 0 D1 1000, or 8,000 A 25,000, 0.8 B 15, 0 C1 1000, and 0 C2 150 wherein: A: specific surface area (cm2/g), B: average particle diameter (μm): 50% particle diameter (d50) (μm), C: 10% particle diameter (μm), D1, C1: water content at between 25° C. and 300° C. by a Karl-Fischer method (heating vaporization method) (ppm), and C2: water content at between 200° C. and 300° C. by the same method.