| 摘要 |
PURPOSE:To increase the quantity of an alkali to be added to thereby improve water resistance and laminatability and polong pot life, by adding a water- resisting agent and a gelatinization temperature-raising agent to a starch adhesive for corrugated board. CONSTITUTION:During the course of the production of an adhesive for corrugated board by using wheat or potato starch as a raw material and an alkali, a water-resisting agent and a gelatinization temperature-raising agent are added to obtain the desired water-resistant adhesive for corrugated board. The term ''water-resisting agent'' used herein refers to a material capable of reacting with starch in the presence of an alkali which catalyzes the reaction to form a three- dimensional network structure, whereby water resistance can be imparted. Examples thereof are phenolic resin and urea resin, and these resins are used in a quantity of 3-20wt based on that of starch. The term ''gelatinization temperature-raising agent'' used herein refers to a material effective in increasing the quantity of the gelatinization energy of starch. Examples thereof are sodium sulfate and calcium chloride and these compds. are used in a quantity of pref. 30wt% or below based on that of starch.
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