| 摘要 |
PURPOSE: To provide a method for fixing a rosin-based sizing agent, capable of improving sizing effect by improving yield of the rosin-based sizing agent. CONSTITUTION: This method for fixing a rosin-based sizing agent comprises adding a rosin-based sizing agent-fixing agent comprising a polymer of plural kinds of water soluble monomers containing 5-90mol% of acryloyloxy ethyltrimethylammonium salt as an essential component and having 18 intrinsic viscosity [η] (intrinsic viscosity in 4% common salt at 25 deg.C) to papermaking raw material slurry containing a rosin-based sizing agent for making neutralized paper and making the mixture into paper.
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