The Development of New ASA Sizing Agent and that Systematized
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概要
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In recent year, low priced wet-end chemicals tend to be used in paper industry because of reducing costs and the productibity. Also the conditions of runnability are getting worse by increasing the recycle fiber sources and the improvement of runnability. Alum used in acid papermaking brought the ability regarding fixation of Rosin sizing agent. But the usage of Alum is getting down as the neutral papermaking is growing because of the weak ability of Alum in higher pH. Rosin sizing agent needs Alum to fix pulp fibers. So some problems happen in neutral papermaking about the fixation of Rosin sizing agent.<BR>And the increase of AKD usage in neutral papermaking tends to decline because of the quality and the cost. In stead of AKD and Rosin sizing agent, Alkenyl succinic anhydride (ASA) is being paid attention in neutral papermaking. ASA sizing agent is spreading in Europe and USA but is not used so much in Japan. In future ASA sizing will be spreading in Japan because of the supply shortage of Rosin and reducing costs.<BR>We need to control the deposit generating by ASA sizing agent in order to make ASA sizing spread in Japan. We investigated the method of emulsion, emulsion polymer, dispersion system and optimum conditions of particle size. Also we developed the new dispersion system in order to control the deposit by ASA sizing agent.
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