Adhesion to Difficult Substrates
TPU adhesives provide excellent initial and final bonding combined with outstanding adhesion to many substrates such as leather, wood, metals, rigid and plasticized PVC, rubbers (TR, SBR, and CR), thermoplastic polyurethanes (TPUs). They can also be used to bond some polyolefins (EVA, PE, PP) if these substrates previously receive an appropriate physical or chemical pre-treatment.
Your good adhesion is a result of several factors:
Chemical bonding between functional groups
- Interaction with the substrate through polar interactions (e.g. hydrogen bonding)
- Polar character of the ester groups
TPU adhesives have been particularly successful in bonding leather, wood, metal and rubber, etc.