Abstract
Among factors relating to alkyl ketene dimer which have an effect on paper sizing, qualities of fatty acid chloride which is an ingredient of alkyl ketene dimer, synthesis process, emulsifying agents and alkyl radicals were investigated.
In sizing effect, distilled fatty acid chloride with less free fatty acid, was superior to undistilled fatty acid chloride with more free fatty acid. The products by filtration method and water washing method to separate amine salt made no difference in sizing effect. Alkyl radical shows a larger reaction velocity with OH radicals of fibre ; therefore adoption of alkyl ketene dimer having relatively short chain length, is recommended for increasing sizing effect at low temperature, but if curred sufficiently, the longer chain length it has, the better it is in sizing effect, however, the difference is not so much. In consideration sizing effect of hexadecenyl ketene dimer, blockade of OH radical of fibre is primary, but at the same time sizing effect is considered to be affected by hydrophilic and lipophilic balance of alkyl radical sizing effect was not affected by any kinds of nonionic surfactants blended, but the less the quantity is, the better the result is.
