The first two of a new family of propylene-butene plastomers is said to feature outstanding compatibility with PP for improving the flexibility, softness, toughness, transparency, and stress-whitening of PP or TPOs. Available from Basell Polyolefins, a LyondellBasell company, Wilmington, Del., Koattro resins are aimed at elastic applications such as film, fiber, tapes, closure liners, and automotive parts. Basell says these plastomers deliver a unique combination of softness (70 Shore A) and elasticity, with a compression set of 45% that is constant almost up to the melting temperature of 114 C (see graph). Comparing the new plastomers with Dow’s Engage polyolefin elastomers, Dow’s Infuse olefin block copolymers, and ExxonMobil’s Exact plastomers, Basell global marketing manager Remi Perrin says, “We can achieve a higher level of performance due to the low-percentage of crystalline phase homogeneously dispersed in the butene-1 polymer. The same level has been achieved in the past only by crosslinking.” Koattro plastomers attain elasticity without crosslinking and achieve improved flexibility without plasticizers. These improvements are said not to compromise processability. These plastomers can improve elasticity in stretch films or can replace PVC in cap liners. They can also be considered for automotive applications in which reduced stress-whitening of finished parts can ease installation on assembly lines. Also, their higher heat resistance offers benefits for instrument panels, TPO skins, and wire/cable. Koattro KT ARO5 boasts excellent compression-set performance at 70 C and has a flex modulus of 20 MPa (2900 psi), ultimate tensile strength of 12 MPa (1740 psi), and ultimate elongation >400%. At low concentrations, it reportedly enhances PP’s heat-seal strength. The second Koattro grade (KT ARO3) is aimed at adhesives. (302) 683-8000 • www.lyondellbasell.com
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