OCTADECYLAMINE AS AN INTERNAL SIZING AGENT

Octadecylamine is effective as an internal sizing agent when used alon e, or without alum as a mordant. With unbleached kraft, pulp, 0.25% oc tadecylamine (on dry pulp) was enough to induce sizing. Bleached kraft pulp required 0.5% octadecylamine. The sizing efficiency depended on the temperature, the presence of metallic, ions, and the storage time of the stock. The optimum pH range was 7-10. paper strength decreased with the use of octadecylamine. However, cationic starch can be added to overcome the strength loss.