| 摘要 |
The anionic aqueous polyurethene adhesive coupsn. is prepd. by reacting, w.r.t. total solid component, 30-70wt.% of polyol comprising 0.5-20% mole of polyester polyol/polyether polyol, 20-35wt.% of diisocyanate, 5-10wt.% of chain extender, and 0.1-1.0wt.% of crosslinking agent in lower boiling point polymerization solvent, in the presence of a catalyst; neutralizing by alkali water solution; then distillating and removing the solvent. Pref. the lower boiling point polymerization solvent is used in the amount of 20-70wt.% w.r.t. total polyurethane component, to two or more of tetrahydrofuran, cyclohexane, acetone, methyletuyl ketone, methyl isobutyl ketone, ethyl acetate, N-methyl pyrrolidone or toluene.
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