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Process for the manufacture of paper or cardboard which is sized under alkaline or neutral conditions with anionic hydrophobic sizing agents and cationic retention aids
Process for the manufacture of paper or cardboard which is sized under alkaline or neutral conditions with anionic hydrophobic sizing agents and cationic retention aids
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机译:在碱性或中性条件下使用阴离子疏水施胶剂和阳离子助留剂上浆的纸或纸板的生产方法
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摘要
Sizing agents devoid of anhydride groups, some of which are known and others are novel compounds, and which carry a single N,N-C.sub. 6 -C.sub. 22 alkyl(or alkenyl)amide group as hydrophobic substituent and at least one anionic group, in particular N,N-C.sub.6 -C.sub.22 dialkyl or N,N-C. sub.6 -C.sub.22 dialkenyl partial amides of a dicarboxylic acid, tricarboxylic acid or sulfocarboxylic acid, or the salts thereof, are particularly suitable, together with commercially available retention aids, for use in a process for pulp-sizing paper or cardboard at a pH of at least 6.5 of the fibre suspension, in the absence of e.g. aluminium sulfate, or in a process for surface-sizing paper.
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