Energy savings plus mechanical reinforcement and rheology control

SBS Hot Melt PSA as an Alternative to SIS in Low Temperature Applications

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Styrene Block Copolymers, SBC (SBS, SEBS, SEPS, SIS)

Applicable Industrial Sectors

Tapes

Applicable Base Polymer Properties

Styrene block copolymers (SBCs) offer cohesion, strength, and heat resistance for both pressure 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 (SBS) has the highest shear strength and moderately good peel strength. Styrene isoprene styrene (SIS) has the highest peel strength although it is cohesively weaker than the SBS resins. The above SBS formulations are developed as lower cost alternatives for SIS.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

SBS polymer, 20% diblock (Solprene 4302, Dynasol)

xxx

Tackifier, glycerol ester hydrocarbon

xxx

Tackifier, terpene resin

Plasticizer, Naphthenic oil

Stabilizer

Typical Properties

Properties

Viscosity (cps) at 150° C

xxxxx

Viscosity (cps) at 177° C

xxxxx

Softening point, °C

Adhesive glass transition temperature, °C

xxx

Rolling ball tack (inches) at 23 ° C

xxx

Rolling ball tack (inches) at 5 ° C

xxx

Rolling ball tack (inches) at 0 ° C

xxx

Rolling ball tack (inches) at -5 ° C

xxx

Processing

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Resulting Properties

The adhesive formulations have relatively good low temperature tack. They also have good melt stability and bond strength (peel and shear) even after aging. When used to formulae PSAs to perform at lower temperatures, SBS copolymers offer the following advantages over SIS copolymers:

Lower Tg
Extended temperature range resistance
Superior elastic properties to maintain good adhesion

The source of SBS Hot Melt PSA as an Alternative to SIS in Low Temperature Applications is Esquivel De La Garza, A., “Developing PSAs for Low Temperature Applications”, Adhesives and Sealants Industry, July 2014, p.22.

Tips and Tricks

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