A process for the preparation of polyurethane adhesives for packing by preparing a prepolymer starting from a diisocyanate of general formula:
wherein R is an aromatic radical containing from 1 to 13 carbon atoms and from a glycol or glycols having an average molecular weight of up to 2000, and thereafter reacting the prepolymers with a N-substituted dialkanolamine of general formula:
wherein R' is an alkyl, aromatic or alkylaromatic radical containing from 1 to 12 carbon atoms and p is an integer from 1 to 4.
一种用于制备包装用聚
氨酯粘合剂的工艺,由通式如下的二
异氰酸酯和平均分子量不超过 2000 的
乙二醇制备预聚物:
其中 R 是含有 1 至 13 个碳原子的芳香族基和平均分子量不超过 2000 的
乙二醇,然后将预聚物与通式为 N-取代二烷醇胺反应:
其中 R'是含有 1 至 12 个碳原子的烷基、芳香族或烷芳族自由基,p 是 1 至 4 的整数。