Styrene block copolymers (SBCs) offer cohesion, strength, and heat resistance for both pressures sensitive adhesives (PSAs) and non-pressure sensitive adhesives. The styrene phase forms a physically crosslinked network in the adhesive at room temperature. Of the SBCs, styrene butadiene styrene has the highest shear strength and moderately good peel strength.
RESULTING PROPERTIES
SBC based adhesives have a good combination of low cost, adhesion, physical properties, and processing characteristics. An SBS solvent borne coating formulation that can be used for heat sealing applications is provided above. The adhesive is coated on two substrates, activated by heating both surfaces to 75°C, and bonded by pressing the substrates together. The adhesive is non-blocking at room temperature and provides high peel strength and creep resistance.
