Effect of Spreading of Neutral Sizing Agent, Alkylketene Dimer, on Sizing Development

  • Published : 2005.12.01


The objective of this work was to investigate the effect of spreading behavior of the sizing agents (AKD or dialkyl ketone) on the sizing development of AKD-sized paper. There was a direct relationship between the spreading behavior of the sizing agents and their melting points. Both AKD and dialkyl ketone showed no substantial spreading until the temperature reaches to their melting points. Consequently, dialkyl ketone did not provide sizing development when the paper was heat-treated below $75^{\circ}C$, while AKD provided sizing effect even the paper heated at $50^{\circ}C$. The ketone, however, provided rather higher sizing effect than that of AKD, when the paper was heat-treated over $100^{\circ}C$. This result means that the ketone also gives sizing development to paper, moreover the ketone could give higher sizing effect to paper than AKD when it was melted and well spreaded on the fiber surface. While the ketone introduced to papers from hydrolyzed AKD emulsion could not contribute to sizing development.


  1. Zhou, Y. J., Time and Size Wait for No Man: A Study of The Effect of Ageing on Alkylketene Dimer Sizing, Paper Technol., 7: 19 (1991)
  2. Akpabio, U. D. and Roberts, J. C., Alkylketene Dimer Sizing: Vapor-Phase Deposition of Tetradecylketene Dimer on Paper, Tappi J., 70(12): 117 (1987)
  3. Royce, R., Internal Sizing, in Course Notes from 1995 Introduction to Wet End Chemistry Short Course, Orange Beach, AL, February 15-17, 1995
  4. Bottorff, K. J., AKD Sizing Mechanism: A More Definitive Description, Tappi J., 77(4): 105 (1994)
  5. Isogai, A., Taniguchi, R., Onabe, F., and Usuda, M., Sizing Mechanism of Alkylketene Dimers. Part 2. Deterioration of Alkylketene Dimer Emulsion, Nordic Pulp Paper Res. J., 7(4): 205 (1992) https://doi.org/10.3183/NPPRJ-1992-07-04-p205-211
  6. Seo, Won-Sung and Cho, Nam-Seok, Effect of water contents on Cellulose/AKD reaction. Appita J. 58(2): 122 (2005)
  7. Marton, J., Practical Aspects of Alkaline Sizing: On Kinetics of Alkyl Ketene Dimers Reactions: Hydrolysis of AKD, Tappi J. 73(11):139 (1990)