Hot Melt Pressure Sensitive Adhesives (HMPSAs) are a unique category of adhesives that become tacky when heated and form a bond when pressure is applied. Here's a summary of their characteristics based on various sources:
HMPSAs are typically based on synthetic rubber mixed with resin and rubber oil, and exhibit a thermoplastic behaviorThey are made from thermoplastic polymers and are solid at room temperature. Upon heating, they liquify and can be applied as adhesives. The pressure-sensitive characteristic of these adhesives is realized through cooling.
A common ingredient in HMPSAs is Styrenic Block Copolymers (SBCs), which contribute to cohesion, strength, and heat resistance. SBCs create a physically cross-linked network in the adhesive at room temperature.
HMPSAs are extensively used in a variety of industries and applications including packaging, labeling, and product assembly due to their bonding capabilities
They are environmentally friendly as they are usually processed without solvents in industries. This characteristic makes them a preferable choice in many industrial applications4.
Once applied, HMPSAs remain permanently tacky, which is advantageous in applications requiring immediate bonding
The unique properties of HMPSAs, such as their pressure sensitivity, thermoplastic nature, and solvent-free processing, make them a highly useful and environmentally preferable adhesive solution in various industrial and commercial applications.