| abstract |
An object of the present invention is to provide a calcium carbonate powder for resin which is uniformly distributed, has high dispersibility and thermal stability, and is particularly excellent in an anti-blocking agent having excellent smoothness, peelability and resistance to deterioration. A calcium carbonate powder for resin characterized by containing calcium carbonate particles and satisfying the following formulas (a) to (e). (a) 1.0? S w? 12.0 (m 2 / g) (b) 0.1? D x? 5.0 (m) 0.1? Dy? 5.0 (d) 0.8? Dy / Dx = Sw: BET specific surface area (m 2 / g) measured by a BET specific surface area measuring device, Dx: Calculated from a BET specific surface area Sw expressed by a calculation formula = 6 / (2.7 · Sw) Dy: 50% diameter (μm) accumulated from the small particle side in the volume particle size distribution measured by the laser diffraction particle size distribution measuring apparatus, and Tw: 100 to 500 nm measured by a differential thermal sizing apparatus, Heat loss (weight%) at 300 占 폚. |