申请人:TOYO INK SC HOLDINGS CO., LTD.
公开号:EP3239261A1
公开(公告)日:2017-11-01
Provided is an adhesive which, in a metal foil-containing laminated composite film used in a high temperature sterilization treatment, is resistant to the effects of moisture in the air during curing, has good workability when used as a solvent-free adhesive, and exhibits excellent adhesive strength and acid resistance. Provided is a method for producing an adhesive composition, the method including: a step of obtaining an alcohol-added isocyanate (E) by reacting a trifunctional or higher isocyanate compound (C2) and a monofunctional alcohol compound (D) at an equivalence ratio of isocyanate groups in the trifunctional or higher isocyanate compound (C2) : monofunctional alcohol (D) = 100 mol% : 25 to 65 mol%, and a step of mixing a polyisocyanate (A) containing a trifunctional or higher polyisocyanate (C1) and the alcohol-added isocyanate (E), and an alcohol (B) having an acid value of 0.5 to 30 mgKOH/g, so that the equivalence ratio between isocyanate groups in the polyisocyanate (A) and hydroxyl groups in the alcohol (B) (isocyanate groups/hydroxyl groups) is within a range from 0.7 to 2.5.
本发明提供了一种粘合剂,在高温灭菌处理中使用的含金属箔的层压复合膜中,该粘合剂可抵抗固化过程中空气中水分的影响,作为无溶剂粘合剂使用时具有良好的可操作性,并表现出优异的粘合强度和耐酸性。本发明提供了一种生产粘合剂组合物的方法,该方法包括:第一步,通过使三官能团或更高官能团的异氰酸酯化合物(C2)和单官能团醇化合物(D)以三官能团或更高官能团异氰酸酯化合物(C2)中异氰酸酯基团的等效比进行反应,得到添加醇的异氰酸酯(E):单官能醇 (D) = 100 mol% : 25 至 65 mol%,以及将含有三官能或更高异氰酸酯 (C1) 和醇加异氰酸酯 (E) 的多异氰酸酯 (A) 与酸值为 0.5 至 30 mgKOH/g 的醇 (B),使多异氰酸酯 (A) 中的异氰酸酯基团与醇 (B) 中的羟基基团之间的等效比(异氰酸酯基团/羟基基团)在 0.7 至 2.5 的范围内。