MATERIALS | IMPACT MODIFICATION
not mix well. In blends of styrenic polymers and PE, it reduces phase separation and strengthens interfacial adhesion, resulting in more consistent mechanical performance and fewer formulation adjustments. It also delivers strong elastic behav- iour, supporting demanding film and sheet applications. Impact strength remains high under standard conditions, with performance decreasing below minus 20°C due to its lower butadiene content compared with conventional SBS materials. In filler-rich systems, the material interacts effectively with calcium carbonate, carbon black, ceramic particulates, carbon fibres, glass fibres, and natural fibres, while improved dispersion supports uniform mechanical properties and enables higher filler levels without compromising impact balance. It also improves melt flow and reduces internal stress during extrusion and injection moulding, supporting smoother production and consistent part quality. Styrolux VSA and Styrolux VSD complement PG77 with lower butadiene content, higher stiffness, dimensional stability, and optical clarity. Structural differences between the two grades allow precise adjustment of melt behaviour,
particularly in film extrusion, thin sheet production, and thermoforming. In combination with PG77, they enable accurate balancing of stiffness, transparency, and surface performance. This system is compatible with a broad range of styrenic polymers including GPPS, HIPS, SBC, and SMMA, and shows partial compatibility with ABS, PC, PE, PP, and SAN. “The real value of this three-grade system lies in the added control it gives compounders,” said Dr Frank Eisenträger, Director Market Development at Ineos Styrolution. “It allows them to balance toughness, stiffness, and processing with greater precision, opening the door to new applications across multiple markets.”
Synergistic study Kraton Polymers has carried out R&D work in modifying thermoplastic polyolefins (TPOs) with styrenic block copolymers (SBCs) and polyolefin elastomers (POEs) used together in a single formulation. These two families of polymers each bring distinct advantages and can create synergies to improve toughness, stiffness, and processing behaviour, while helping reduce overall material
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