Olefin block copolymers aimed at auto interiors.
Traditional metallocene elastomers, such as Dow's Engage, are random copolymers of ethylene and an alpha olefin. New Infuse elastomers consist of linear MDPE hard blocks and Engage-type ethylene-octene soft segments. OBCs have higher melting points (around 120 C vs. 60 to 90 C for Engage), and higher crystallization temperatures (about 100 C vs. 45 to 75 C). Faster set-up in molding and extrusion is said to result. However, the glass-transition temperature (Tg) of OBCs is similar to random ethylene copolymers, which translates into similar low-temperature ductility.
OBCs also boast lower compression set and better abrasion resistance. They are expected to process much like random copolymers due to comparable shear rheology and melt strength. Tel: (800) 441-4369 * www.dow.com/infuse
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|Title Annotation:||KEEPING UP WITH: MATERIALS|
|Date:||Feb 1, 2007|
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