The Role of Tackifier Resins on Pressure Sensitive Adhesives - ECOPOWER Feb 21, 2022

Thermoplastic elastomer SIS itself has no initial tack, and must be added with tackifier resin to have pressure-sensitive properties.

The key to the performance of the pressure-sensitive adhesive is the viscoelasticity of the adhesive. The function of the tackifier is to give the pressure-sensitive adhesive the necessary viscosity.

Since the thermoplastic elastomer has a two-phase aggregated structure, it must be considered when selecting the tackifier resin.

Tackifier resins that are compatible with the rubber phase (PB, PI) in thermoplastic elastomers include rosin and rosin resin, terpene resin, C5 petroleum resin, etc., which give the pressure-sensitive adhesive the viscosity and are compatible with the plastic phase (PS).

Adhesive resins include coumarone resin, aromatic petroleum resin, PS resin, etc., which can improve the cohesion of pressure-sensitive adhesives. There are also some tackifier resins that are compatible with both phases, such as high softening point terpene phenolic resins and low softening point aromatic hydrocarbon petroleum resins. Phenolic resins are incompatible with both phases of thermoplastic elastomers.

 

After adding tackifier resin mixed with SBS and SIS, the glass transition temperature of the two phases was changed as measured by twisted braid analysis (TBA), which affected the pressure-sensitive adhesive and performance.

Terpene resin greatly increased the Tg of the PB phase, and slightly decreased the Tg of the PS phase;

The rosin resin had a greater effect on the Tg of the PB phase, but had a lesser effect on the Tg of the PS phase;

The Tg of the C5 petroleum resin PB phase increased more than Small, but the Tg of the PS phase varies greatly;

The aromatic petroleum resin C9 is not very compatible with the two phases and has little effect on the Tg.

 

The terpene resin system has the best performance, with good fast tack and peel strength, and moderate stickiness. The comprehensive performance of C9 petroleum resin is the worst.

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