ADDITIVES | IMPACT MODIFIERS
Polyester polycaprolactone-based TPU solutions
from Lubrizol are said to enhance the properties of a wide range of plastics and elastomers, including PVC, ABS, EPDM, EVA, POM, SEBS, TPV, and silicone, improving low temperature flexibility, adhesion, conductivity, and dimensional stability (due to reduced moisture absorption). They can also enhance impact resistance. For example, Pearlcoat DIPP 119 TPU, a soft, transparent, and plasticiser-free grade that exhibits good abrasion resistance, is widely used to improve impact performance and flexibility at low temperatures in PVC compounds and plastisol. The company says that, when adding glass fibre, its rigid Estaloc series has one of the best impact notched resistances and a translucent surface, even at more than 3mm thickness. It adds that its Estane Silk, Pearlcoat TPU, and Estaloc RETPU ranges offer numerous possibilities for impact modification, while the ability to customise TPU compounds with additives further enhances their suitability for specific requirements.
Increasing demand US-based styrenic block copolymers (SBCs) producer Kraton says its products are known for their good impact modifying performance. The company says it sees increasing demand for TPO material solutions with good impact performance and stiffness properties together with a high level of transparency. Enhanced TPO transparency elevates the visual
Figure 3: Charts showing notched Izod impact performance at 21°and haze (1.6mm) of Kraton’s latest SEBS polymer (SEBS 3) in a TPO compound compared to formulations based on current SEBS and mPOE grades
Source: Kraton
appeal and aesthetics of end products and holds particular significance for the automotive industry, the company says, adding that many OEMs and suppliers are today seeking optimised solutions for transparent exterior components. It attributes this to the on-going electrification of vehicles, which obviates the need for traditional air inlets in front grilles and encourages diverse backlighting options. The challenge for compound developers is to
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