| 摘要 |
PROBLEM TO BE SOLVED: To obtain an additive for recycling waste paper, improving the bulkiness and oil-absorption of a recycled paper sheet obtained by using the waste paper, and reducing the foul of an apparatus in a papermaking step, and the foul of the recycled paper sheet, and further to provide a method for producing the recycled paper sheets. SOLUTION: The additive for recycling the waste paper contains (a) a condensate obtained by reacting (i) a specific amine compound or (ii) an amine compound obtained by reacting a 10-24C aliphatic monocarboxylic acid with a specified compound, with urea in an amount of 0.1-1.5 times molar quantity of the amine compound, and (b) a specific nonionic surfactant, a cationic polymer, or the like, in the weight ratio of (99:1)-(60:40). The method for producing the recycled paper sheet is carried out by adding the additive in an amount regulated so that the total amount of the components (a) and (b) is 0.03-8 wt.% based on the amount of the waste paper pulp.
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