Date of Award
Bachelor of Science
Paper Science and Engineering
Dr. Raymond Janes
Alkenyl Succinic Anhydride (ASA) is a cellulose reactive size used in neutral to alkaline papermaking. Since ASA exists as an oil at room temperature, it must be emulsified in cationic starch to make it compatible with the aqueous wet and environment.
The advantages of using a cationic starch in an ASA sizing system include improved retention of fines, filler, and size; improved sizing efficiency; and improved strength. Mill and laboratory experience has shown, however, that cationic potato starch is superior to corn starch. Their are two main differences between potato starch and corn starch: (1) potato starch typically has a higher molecular weight and (2) contains more bound phosphate than corn starch.
The effect of molecular weight and cationic charge of quaternary ammonium waxy maize corn starches on the sizing efficiency of ASA emulsions were evaluated. The results show that increased molecular weight does not contribute to the sizing efficiency of ASA emulsions, and may actually reduce the sizing efficiency. The results also show that high charged starches are far superior to low charged starches, regardless of molecular weight.
Nebel, George T., "The Effects of Molecular Weight and Degree of Substitution of Cationic Starch on the Sizing Efficiency of Alkenyl Succinic Anhydride" (1986). Paper Engineering Senior Theses. 453.