Polyolefins (Término temático)

Work cat: Shah, S.D. All olefinic interiors, ©2000: abstr. (TPO is getting wider acceptance for automotive applications. An exterior application like a fascia is a very good example. Interiors are still a challenge due to many reasons including overall system cost. For interior applications, "all-olefin" means it mainly consists of three materials: TPO skin, cross-linked olefinic-based foam and PP substrate. The driving force for TPO in Europe is mainly recyclability while in the USA, it is long-term durability. ... )

Merriam-Webster dictionary online, May 12, 2020 (polyolefin: a polymer of an alkene (such as polyethylene))

Plastics Europe web site, May 12, 2020 (Polyolefins are a family of polyethylene and polypropylene thermoplastics. They are produced mainly from oil and natural gas by a process of polymerisation of ethylene and propylene respectively. Their versatility has made them one of the most popular plastics in use today)

SGS Polymer Solutions Incorporated web site, May 12, 2020 (The most common type of thermoplastics, polyolefins are also some of the most widely used type of plastic. Science classifies plastics into two basic categories: thermoplastics, which can be melted and returned to their original state, and thermosets, which can't.)

Thermoplastic Polyolefins (TPO) - RTP Company, via WWW, Feb. 18, 2020 (Thermoplastic Polyolefins (TPOs) are polypropylene based materials that have been modified to provide better ductility and impact resistance compared to standard off-the-shelf Polypropylene (PP) grades. TPOs retain the ease of processing, lightweight nature, and chemical resistance of PP. However, they do not require drying prior to molding, which saves on both cost and time. Often, TPOs are compounded with fillers -- usually minerals -- to provide a good balance of stiffness and impact resistance, as well as better dimensional stability and increased Heat Deflection Temperature (HDT). Proper choice of minerals allows these filled compounds to retain ductile behavior well below 0 °C, something traditional PPs cannot achieve. Stiffness and impact resistance can be custom tailored to provide the right balance for a wide range of applications. While the cost of TPOs are often slightly higher than traditional PP compounds, TPOs are still a very cost effective choice for applications requiring good impact resistance and stiffness when other Polyethylene (PE) or PP materials do not meet the application demands)

What is TPO -- Hexpol TPE, via WWW, Feb. 18, 2020 (What is TPO? Thermoplastic Polyolefins (TPO or TPE-O). TPO compounds are resin blends of polypropylene (PP) and un-crosslinked EPDM rubber and polyethylene. They are characterised by high impact resistance, low density and good chemical resistance. They are used in applications where there is a requirement for increased toughness and durability over the conventional PP copolymers, such as automotive bumpers and dashboards. The properties are restricted to the high end of the hardness scale, typically >80 Shore A and with limited elastomeric properties. TPOs can be easily processed by injection moulding, extrusion or blow moulding)

Dow Chemical Company. Dow specialty elastomers for thermoplastic polyolefins, 2013: page 2 ( ... Thermoplastic polyolefins (TPOs) generally refers to a class of plastic used in a variety of markets and applications -- especially in the transportation sector, including automotive exterior and interior fascia. The TPOs are usually injection molded into the desired article, though there is increasing use of sheet and profile extrusion/thermoforming and other processes. TPOs are generally produced by the blending of polypropylene (PP) with elastic ethylene copolymers (polyolefin elastomers or POEs), and the addition of other fillers and additives. The specific blending amounts are dependent upon the overall balance of properties to meet performance specifications and desired processing equipment used for an application. TPO ingredients generally include: Polypropylene (including homopolymer, impact copolymer, or others), which generally provides rigidity and temperature stability; elastomers, which give flexibility and impact strength; talc or other mineral fillers, which impart higher part stiffness and dimensional stability; other additives (including antioxidants, plasticizers, and additives for ignition resistance, scratch and mar resistance) for improving end-use performance and durability)