Method of sizing paper.

摘要

A starch which has been reacted with a dicarboxylic acid anhydride such as octenyl succinic anhydride is applied to a formed paper web from the size press. The starch combines with a multivalent metal ion e.g. (aluminium) already present in the paper web to become hydrophobic, and thereby impart a high level of water resistance concentrated at the surface of the paper.