| 摘要 |
<p>PATENT APPLICATION OF HARRY D. BAUMAN USE OF GROUND LIMESTONE AS A FILLER IN PAPER Combinations of fine particle size precipitated CaCO3 and coarser natural ground limestones, up to about 35% ground limestone, have the same opacifying power in paper as does 100% precipitated CaCO3, provided the ground limestone has the proper particle size distribution.</p> |
