To obtain a product reduced in chemically synthesized materials and friendly to the earth (environment) by using an acetylated bacterial cellulose having a specific degree of acetyl substitution for an adhesive and a coating material.
A bacterial cellulose is obtained from a culture liquid in which a cellulose-producing bacteria BPR3001A (FERM P-14982) is cultured in a cornsteep liquor/fructose media at 28°C for 3 days. After refined, 1 pt.wt. above cellulose is dipped in 20 pts.wt. glacial acetic acid for 72hrs to obtain an acetylated product. After acetic acid is removed, an acetylation agent consisting of a 20-fold amount of acetic anhydride, a 20-fold amount of glacial acetic acid and 4 pts.wt. 97% conc. sulfuric acid is added to 100 pts.wt. of the cellulose. The mixture is kept at 10-30°C for 0.5hr. and, after the reaction is completed, neutralized and washed with water to obtain an acetylated product which has a degree of acetyl substitution of 0.8-1.5. This acetylated product with a low degree of acetyl substitution has a remarkable adhesive property and coating effect.
WATABE OTOHIKO
MORINAGA YASUSHI
