| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for improving a water filterability, improving the filterability on a wire and sufficiently reducing water content after dehydrating press, since each of the conventional filterability-improving agents have problems such as a polyethylene imine with its foaming and cost, a polyvinyl amine and polyamidine with their production, and a quaternary ammonium base-containing polymer with its high hydrophilic property. SOLUTION: This method for improving the water filterability is to add a primary amino group-containing polymer produced by polymerizing a monomer (or a mixture) consisting of a primary amino group-containing acrylic type monomer as an essential component, into a paper-forming raw material before its paper making.
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