A curative containing two or more primary hydroxyl groups per molecule and one or more moieties derived from a secondary hydroxyl-containing polyol such as polypropylene glycol is prepared in a multistage process wherein the secondary hydroxyl-containing polyol is end-capped with an excess of a reactant such as a polybasic acid and the resulting functionalized intermediate is then reacted with a polyol such as glycerin or diethylene glycol containing primary hydroxyl groups. Such curatives may be used in combination with isocyanate-functionalized polyurethane prepolymers to provide two component adhesives useful for laminating thin films and/or foils.
一种每分子含有两个或两个以上伯羟基和一个或一个以上衍生自含仲羟基多元醇 (如聚
丙二醇)的分子的固化剂是通过多级工艺制备的,其中含仲羟基的多元醇用 过量的反应物(如
多溴联苯酸)封端,得到的官能化中间体再与含伯羟基的多元醇 (如
甘油或
二甘醇)反应。此类固化剂可与
异氰酸酯官能化聚
氨酯预聚物结合使用,提供用于薄膜和/或箔层压的双组分粘合剂。