Tackifying resin and compatibility of hot melt pressure sensitive adhesive

2021/03/18

     Hot-melt adhesive pressure-sensitive resin is an important performance index of hot-melt pressure-sensitive adhesive, and its performance mainly depends on its molecular weight and molecular structure.


     For example, rosin pentaerythritol esters and rosin glycerides are good tackifiers for hot melt pressure-sensitive adhesives. SBS uses rosin pentaerythritol esters to prepare pressure-sensitive adhesives with high transparency, no turbidity in the cross section, and good colloidal elasticity. SBS has good compatibility and can obtain a suitable elastic modulus. But the peel strength obtained by rosin glyceride is lower, and the color of the colloid gum rosin glyceride will deepen about 2 color numbers. However, using rosin pentaerythritol ester as a low-softening point hot-melt pressure-sensitive adhesive, the transparency is still better, and the elasticity is better;

     Used as a hot-melt pressure-sensitive adhesive with a softening point higher than 115°C, the transparency becomes poorer and the colloidal elasticity becomes weaker. As the softening point increases, the relative molecular weight of the tackifying resin increases, and the space structure of the resin becomes more complex. Poor compatibility performance