| 摘要 |
PURPOSE:To prevent an abrasion of a photosensitive body by regulating a content of calcium carbonate of a filler to <=8wt% on the wt basis of the paper powder, thereby reducing calcium carbonate content in the paper powder. CONSTITUTION:A heavy calcium carbonate obtd. by grinding a limestone and a shell-chalk, and a precipitated calcium carbonate may be used as the calcium carbonate filler. The precipitated calcium carbonate is prepared according to a carbon dioxide combination method of reacting a milk of lime with carbon dioxide, a milk of lime-soda combination method and a calcium chloride combi nation method. If the compounding amount of calcium carbonate is insufficient to obtain a filler effect, another filler having less abrasion e.g. a talc and a kaolin-clay etc. may be used with calcium carbonate. And an alkylketene dimer and an alkenyl succinic anhydride are preferably used as an engine sizing agent. |
