DURABIO™

Definition

DURABIO™ is a proprietary, partially bio-based, amorphous engineering thermoplastic developed by Mitsubishi Chemical Group. It is a polycarbonate-type copolymer that incorporates isosorbide—a diol derived from renewable glucose—as a key monomer. The resin is BPA‑free, optically transparent, and designed to combine PC-like mechanical strength with PMMA-like surface hardness and weatherability. It is typically supplied as pellets for injection molding and extrusion.

Key properties and functions

  • Optical performance: High transparency and gloss with low birefringence and good color stability; suitable for light guides, cover lenses, and decorative “piano black” surfaces.
  • Mechanical behavior: High rigidity and impact resistance with good dimensional stability; grades are available to reduce warpage and coefficient of linear thermal expansion (CLTE).
  • Surface durability: Higher surface hardness and improved scratch/abrasion resistance versus standard PC; good resistance to common automotive chemicals (e.g., alcohols, cleaners, skin oils), helping reduce stress whitening and surface degradation.
  • Weatherability and UV resistance: Superior resistance to UV-induced yellowing and hazing compared with conventional PC, enabling long-term outdoor and interior exposure.
  • Thermal performance: Heat resistance in the range typical of engineering plastics in the PC family; remains amorphous (no crystallization) and maintains clarity across a broad temperature range.
  • Processing: Moldable by standard thermoplastic processes (injection molding, extrusion, thermoforming of sheet). Supports thin-wall molding, precise replication, coloring, in-mold decoration/labeling (IMD/IML/INS), laser etching for backlit icons, and adhesion of hard coats or paints when required.
  • Sustainability: Partially renewable content via isosorbide reduces reliance on fossil feedstocks; BPA‑free chemistry. The ability to deliver durable, paint-free high-gloss surfaces can help reduce VOC emissions and process steps.

Relevance

DURABIO™ is used where a combination of clarity, durability, chemical and UV resistance, and design flexibility is needed. In automotive and EV applications, it enables lightweight, glossy, and optically clear components that withstand frequent cleaning and outdoor exposure, support integrated lighting and sensors, and can eliminate paint or heavy coatings on interior/exterior trims. This contributes to aesthetic quality, reduced mass versus glass or metal, simplified manufacturing, and sustainability goals.

Typical applications

  • Automotive exterior: Grille and pillar garnishes, illuminated emblems and badges, lamp bezels/lenses, mirror housings, ADAS sensor covers, and other UV-exposed trims.
  • Automotive interior: Display and touch-panel cover lenses, center console and instrument panel decorative panels, “piano black” trims, ambient light guides, switch bezels, and backlit icon panels.
  • Electronics and other: Device cover lenses and housings, optical components, appliance and lifestyle products requiring durable high-gloss surfaces; also available as filament for certain 3D printing applications.

Grades and options

  • Available in multiple grades tailored for clarity, rigidity, low warpage/low CLTE, and other design needs.
  • Flame-retardant grades (e.g., achieving UL 94 V-0 at thin sections, depending on grade) are offered for electrical/electronic and in-vehicle use.
  • Can be supplied transparent or pre-colored; compatible with secondary finishes (hard coat, anti-reflective coating, printing, laser etch).

Related/competing materials

  • Related: Conventional polycarbonate (PC), PMMA (acrylic), COP/COC (cyclo olefin polymer/copolymer), and other bio-based polycarbonate-type resins.
  • Note: DURABIO™ is a proprietary formulation; it is not a direct synonym for PC or PMMA, though it often competes with or bridges the properties of these materials.

Notes

  • Chemistry: Isosorbide-based, BPA-free polycarbonate-type copolymer.
  • Regulatory/ESG: Marketed for renewable content and potential manufacturing VOC reductions via paint-free surfaces; bio-content varies by grade and region.
  • Processing: Standard drying, gating, and mold temperature practices for high-clarity amorphous resins apply; consult grade-specific datasheets for conditions.

Example

  • Reported automotive use includes interior control/cover panels and decorative trims (e.g., adoption in components such as a rear heater control panel in Toyota’s second-generation Mirai).

Trademark

DURABIO™ is a trademark of Mitsubishi Chemical Group.

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