| 摘要 |
PURPOSE:To obtain a compsn. which is excellent in water resistance even when dried or heat-treated at a relatively low temp. and is colored little even when kept long at high temp. and humidity by compounding a PVA resin with chitosan having a low degree of polymn., an aldehyde compd., a reducing agent, and a free-radical scavenger. CONSTITUTION:This water-resistant compsn. is obtd. by compounding 100 pts.wt. PVA resin with 1-90 pts.wt. chitosan having a viscosity (a 1-wt.% aq. soln. at 20 deg.C of 70cP or lower, 1-20 pts.wt. aldehyde compd., 0.0001-10 pts.wt. reducing agent, and 0.0001-10 pts.wt. free-radical scavenger. The compsn. is very excellent in resistance not only to cold water but also to hot water even when dried or heat-treated at a relatively low temp., colored little even when kept long at high temp. and humidity, and thus excellent in stability of qualities. |
