Two-component polyurethane foam adhesive, a process for preparing the same and an article made therefrom

A two-component polyurethane foam adhesive comprising:

• (A) an isocyanate prepolymer component, obtained by mixing
• (A1) at least one first polyether polyol having an average functionality in between 1.9 to 3.5 and a hydroxyl number in between 10 mg KOH/g to 100 mg KOH/g, and
• (A2) at least one polymeric isocyanate, wherein the isocyanate prepolymer has an isocyanate content in between 15 wt.-% to 28 wt.-%, and
• (B) an isocyanate reactive component comprising
• (B1) 50 wt.-% to 90 wt.-% based on a total weight of the isocyanate reactive component of a second polyether polyol having an average functionality in between 1.9 to 3.5 and a hydroxyl number in between 10 mg KOH/g to 40 mg KOH/g, and
• (B2) 0.5 wt.-% to 30 wt.-% based on the total weight of the isocyanate reactive component of a third polyether polyol having an average functionality in between 1.9 to 8.0 and a hydroxyl number in between 40 mg KOH/g to 1000 mg KOH/g.