| abstract |
[PROBLEMS] To effectively use a natural polymer containing cellulose such as paper, fine fiber, wood, and straw in industrial / household waste, or a cellulose-based material such as waste paper, and can be used at a high concentration. An object of the present invention is to provide an additive for papermaking that has a small drying load after coating and can obtain a sufficient compressive strength. A cellulose-based material and a solvent are mixed, and the solvent is made into a supercritical state or a subcritical state, whereby the cellulose-based material is reduced in molecular weight, and a paper additive containing a cellulose degradation product is produced. To do. [Selection figure] None |