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Hot Melt Pressure Sensitive Adhesive

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:

Composition and Behavior:

HMPSAs are typically based on synthetic rubber mixed with resin and rubber oil, and exhibit a thermoplastic behavior​They 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​​.

Applications:

HMPSAs are extensively used in a variety of industries and applications including packaging, labeling, and product assembly due to their bonding capabilities​

Environmental and Processing Advantages:

They are environmentally friendly as they are usually processed without solvents in industries. This characteristic makes them a preferable choice in many industrial applications​4​.
Physical Properties:

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.

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