Energy savings plus mechanical reinforcement and rheology control

Electron Beam Crosslinkable Styrene-Butadiene-Styrene HMA

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

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

Applicable Industrial Sectors

Automotive , Buildings & constructions

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 has the highest shear strength and moderately good peel strength. Crosslinking via UV or EB radiation will provide even greater heat resistance.

Typical Formulation Ingredients

Ingredient

Parts by weight

Styrene butadiene styrene copolymer

xxx

Tackifier

xxxxxx

Plasticizing oil

xxxx

Butyl zimate (ZDBC)

xxx

Cosslinking agent (Multifunctional crosslinking agents such as trimethylolpropane trimethacrylate (TMPTM), trimethylolpropane triacrylate (TMPTA), or 1,6-hexanedioldiacrylate (HDODA).

xxxx

Typical Properties

Properties

SBC based adhesives have a good combination of low cost, adhesion, physical properties, and processing characteristics. By crosslinking with ultraviolet or electron beam radiation, a crosslinked adhesive can be achieved having improved heat resistance,

Processing

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Resulting Properties

Radiation curable hot melt adhesives can be block copolymers such as styrene-butadiene-styrene polymer. The above formulation is an example of a typical EB curable hot melt adhesive. Multifunctional crosslinking agents are often incorporated at concentrations from 1-25 parts per hundred of rubber. These crosslinking agents provide high peel and shear strength. Additions of stabilizers such as butyl zimate (ZDBC) can be employed to reduce the degree of crosslinking. Tackifying resins in pressure sensitive adhesives formulations are also important in achieving the correct balance between crosslinking (cohesive strength) and adhesion.

Tips and Tricks

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