A NEW GENERATION OF HOT MELT TAPE FORMULATIONS, USING
BLENDS OF SIBS AND SBS BLOCK COPOLYMERS AND NEW
HYDROCARBON TACKIFYING RESINS [2006]
Chrétien Donker, Product Application Manager
Eastman Chemical Middelburg BV,
Middelburg, The Netherlands.
Adhesive formulators are looking for alternative polymer systems due to the impact of isoprene
availability on the supply of SIS (styrene- isoprene- styrene) block copolymers. These polymers are an
essential part of most hot melt pressure sensitive adhesive (HMPSA) formulations.
KRATON Polymers have developed a new type of block copolymer with an SIBS (styrene- isoprenebutadiene-
styrene) structure. The midblock of this block copolymer consists of a blend of isoprene and
butadiene monomers and needs less isoprene and hence is less dependant on isoprene monomer
availability. Eastman Chemical Company has developed a series of new hydrocarbon resins that are
suitable to tackify this new generation of block copolymers.
Another type of block copolymer is SBS (styrene- butadiene- styrene). This polymer does not contain
isoprene at all, but is difficult to formulate to provide the right balance of adhesive properties and
coatability for a number of applications.
This paper will discuss the possibility of using a blend of SIBS and SBS block copolymers in HMPSA
formulations, thus minimizing the amount of isoprene monomer needed. Such a blend needs specially
developed hydrocarbon resins to formulate adhesives for HMPSA applications.
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