Development of Pressure Sensitive Adhesives Peeled Easilyby Changes in Temperature

Abstract

Acrylic pressure-sensitive adhesives （PSAs） are widely used from industrial manufacturing processes to

commercial products because of their self-adhesion, weather and water resistances, and low cost.

Among these uses, industrial manufacturing processes require the acrylic PSAs to show high adhesive property

and easy peelability according to various situations and environments. Therefore, it is very interesting

to control the adhesive property and peelability of the acrylic PSAs by their chemical structures and external

stimuli such as light and heat. The control of the adhesive property by heat is useful because it is convenient

and easy to incorporate into the manufacturing processes. An acrylic PSA bearing a long alkyl side chain group

as its crystalline unit can control its adhesion because the crystalline unit undergoes a reversible order-disorder

transition with a change in temperature. By use of this reversible phase transition, it is possible to develop

a“ cool-off”（ CO） type adhesive that can be easily peeled off by cooling and“ warm-off”（ WO） type adhesive

that can be easily peeled off by heating. In this review, we introduce CO-type PSAs for high-temperature heat

resistance and a WO-type PSA with improved WO function that we have developed so far.