Adhesive containing starch and a process for producing it

Details Adhesive containing starch and a process for producing it Adhesive containing starch and a process for producing it

C - Chemistry, Metallurgy

09

J

6/97

C09J 103/02 (2006.01)

Patent

CA 1165058

13 A b s t r a c t _______________ An adhesive, particularly for use in the making of corrugated cardboard, consists of starch, water and al- kali in such proportions that the mixture contains 10 to 40% by weight of starch solids and has a pH value of 8 to 13, a gel point of 52 to 75°C and a Stein-Hall viscosity of 20 to 120 seconds. The starch consists of completely ge- latinized starch and partly swollen starch in a weight ratio between 0.2:100 and 2:1, which results in a greatly increased gelatinization rate and thereby in- creased wet tack of the adhesive, and this in turn per- mits greater machine rates in the making of corrugated cardboard. The adhesive may be produced by first maintaining a mix- ture of ungelatinized starch and water at 20 to 100°C, preferably in the presence of an acid or a base, until th starch is completely gelatinized, then adding more ungela- tinized starch and optionally water, adjusting pH to be- tween 8 and 13 and maintaining the mixture at 20 to 75°C until it has reached a Stein-Hall-viscosity between 25 and 130 seconds, followed by the addition of a reaction in- hibitor, preferably borax, alum, another acid material, cold water or ice, in an amount such that the gel point of the mixture will be between 52 and 75°C. The initial com- plete gelatinization of ungelatinized starch may optionally be replaced by an addition of completely gelatinized starch powder. .

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