| 摘要 |
PURPOSE:To obtain a compsn. which has excellent water resistance and film- forming properties and gives a coating film having excellent strength, by blending a polyvinyl alcohol resin, chitosan and an aldehyde compd. CONSTITUTION:A compsn. consists of a polyvinyl alcohol resin (A), chitosan (B) having a viscosity (1% aq. soln. at 20 deg.C) of 70cP or below and an aldehyde compd. (C). Pref. chitosan has such a viscosity that 1% aq. soln. thereof has a viscosity of 1-30cP, particularly 1-10cP. Examples of the aldehyde compds. are monoaldehydes, polyaldehydes and condensates of an amine with formalin. The blending ratio is such that A/B is 99/1-10/9 and (A+B)/C is 100/1-100/20.
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