Sumitomo Chemical Company, Limited

Hayashibara Biochemical Laboratories, Inc.

Kosuke Fukami

Masanori Fujimoto

Kozo Tsuji

Tsuneyuki Nagase

Fumio Fujita

A method for improving the water-resistance of pullulan, which is a linear high polymer having the following structural formula: ##STR1## and useful as films, sheets, fibers and the like.

Method for improving water-resistance of pullulan

Pullulan aminoalkyl ether is obtained by reacting pullulan with an aminoalkylating agent in a solvent in the presence of an alkali. This ether may be used as a cationic polymer of considerable utility in industries. For instance, when used in a paper coating material, it gives desirable effects on gloss, RI dry pick, and RI wet pick and, furthermore, as compared with pullulan, markedly improves physical properties of the coated paper such as tearing strength, tensile strength and wrinkle recovery; it improves also retention of loading materials such as clay and calcium carbonate.

Growing community of inventors

Settsu, Japan

Kosuke Fukami