KTR 401 Styrene Butadiene Styrene Block Copolymer
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KUMHO KTR is SBS block copolymer product manufactured by polymerizing styrene and butadiene in organic solvent. With its molecular structure, SBS is a thermoplastic elastomer that has an excellent recovery capacity from deformation and high elasticity without vulcanization. KUMHO KTR® 401 polymer is a radical block copolymer based on styrene and butadiene with bound styrene of 31.0% mass. It is supplied in two physical forms, identified as follows in the grade nomenclature: KTR 401 supplied as porous pellets KTR 401P supplied as powder
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Styrene Butadiene Styrene Block Copolymer
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A basic understanding of block copolymers is crucial in the study of adhesive formulation. In particular, styrene block copolymers (SBC) are a vital component in a wide range of hot melt adhesives. SBC's have a characteristic structure that makes them ideally suited for many adhesive applications. The selection of a tackifier for a block copolymer depends on the composition of the midblock. SBS block copolymers are somewhat more difficult to tackify, are less stable than SIS, and require either C5C9 hybrid or rosin ester tackifiers. SBS block copolymers are more readily available and cost less than SIS It exhibits medium molecular weight, high strength, easy processing, and good solubility in common adhesive solvent.
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