Olefin block copolymers aimed at auto interiors.Developmental Infuse in·fuse v. 1. To steep or soak without boiling in order to extract soluble elements or active principles. 2. To introduce a solution into the body through a vein for therapeutic purposes. thermoplastic olefin ThermoPlastic Olefin (TPO) is a trade name that refers to polymer/filler blends usually consisting of some fraction of PP (polypropylene), PE (polyethylene), BCPP (block copolymer polypropylene), rubber, and a reinforcing filler. block copolymers (OBCs) from Dow Chemical, Midland, Mich., appear promising for a wide range of automotive applications as both neat resins and as impact modifiers. Initial work is focused on using OBCs as neat resins in two-shot molding of soft-touch interior components such as knobs, inlays, and trays of center consoles. Traditional metallocene elastomers, such as Dow's Engage, are random copolymers of ethylene and an alpha olefin olefin (ō`ləfĭn) or olefin series: see alkene. olefin or alkene Any unsaturated hydrocarbon containing one or more pairs of carbon atoms linked by a double bond (see . New Infuse elastomers consist of linear MDPE MDPE Medium Density Polyethylene MDPE Mobile Dual-Phase Extraction (technique for environmental cleaning) MDPE Mobile Dual-Phase Extraction (USA) MDPE Maximum Permissible Dose Equivalent 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 Crystallization The formation of a solid from a solution, melt, vapor, or a different solid phase. Crystallization from solution is an important industrial operation because of the large number of materials marketed as crystalline particles. 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 [GRAPHIC OMITTED] |
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