| 摘要 |
<p>PURPOSE:To provide a deinking agent and a deinking method exhibiting excellent ink-removing performance in the deinking of waste paper, especially waste OA paper or its mixture and enabling the improvement of whiteness, reduction of coarse ink content and improvement of the defoamability of flotation reject. CONSTITUTION:The objective deinking agent contains, as an essential component, a compound having a solubility parameter value falling within a specific range and produced by the addition of an alkylene oxide to a 1-8C alcohol or fatty acid at a ratio falling within a specific range. The deinking agent is dividedly added to the pulping process and the following processes.</p> |
