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Aliphatic TPU (aliphatic thermoplastic polyurethane) is a segmented thermoplastic elastomer in which the hard segments are built from aliphatic diisocyanates (commonly HDI, IPDI, or H12MDI) reacted with polyols (polyether or polyester) and short-chain extenders, producing a melt-processable polymer that combines rubber-like elasticity with thermoplastic reprocessability. Relative to aromatic TPU, the defining engineering intent of an aliphatic backbone is photochemical stability: markedly improved UV resistance, weatherability, and non-yellowing color retention, enabling long-life transparent or light-colored parts, outdoor films/coatings, and appearance-critical components. Industrially it is manufactured via prepolymer or one-shot routes (often continuous reactive extrusion), pelletized and compounded with stabilizers, pigments, and processing aids; performance is tuned through soft–hard segment ratio and polyol selection (polyether grades favor hydrolysis/microbial resistance and low-temperature flexibility, polyester grades favor abrasion and solvent/oil resistance). In the value chain, aliphatic TPU sits downstream of aliphatic diisocyanates, polyols, extenders, and additives, and upstream of converters using extrusion, injection molding, blow molding, calendaring, and film casting to serve applications such as medical and wearable components, consumer electronics protection, automotive exterior and interior trim with color stability, outdoor cable jacketing, specialty films, and optical or cosmetic-grade elastomer parts where long-term appearance and UV durability are non-negotiable.
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