NDLI: Application of cationic polymer prepared from sulfuric acid lignin as a retention aid for usual rosin sizes to neutral papermaking

Content Provider	Springer Nature Link
Author	Matsushita, Yasuyuki Iwatsuki, Ayuko Yasuda, Seiichi
Copyright Year	2004
Abstract	Cationic polymers that acted as the retention aids for usual rosin sizes in neutral papermaking were prepared from sulfuric acid lignin (SAL), one type of acid lignin. To convert SAL to the cationic polymer (MP-SAL), SAL was phenolated and then treated by the Mannich reaction to introduce the amino groups. In the MP-SAL single system, MP-SAL exhibited high sizing effectiveness in neutral papermaking with the rosin emulsion size. However, MP-SAL showed no sizing effectiveness when soap rosin size was used. MP-SAL showed increased sizing effectiveness as the pK a of the introduced amino group increased. From this and comparison of the sizing degrees of MP-SAL and polyethylenimine, which possesses a linear structure, it was suggested that the sizing effectiveness was not only affected by the charge density and molecular weight, but also by the basicity of the introduced amino groups and the molecular structure of the retention aid. In the alum–MP-SAL dual system, alum and MP-SAL synergistically enhanced the sizing effectiveness in the rosin emulsion sizing at neutral pH. In turn, this allowed a decrease in the MP-SAL dosage and resulted in a small decrease in brightness.
Starting Page	540
Ending Page	544
Page Count	5
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	50
Issue Number	6
e-ISSN	16114663
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-11-25
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Lignin Rosin size Retention Mannich reaction Paper Characterization and Evaluation Materials Ceramics, Glass, Composites, Natural Methods Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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Application of cationic polymer prepared from sulfuric acid lignin as a retention aid for usual rosin sizes to neutral papermaking

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