Ultraviolet Absorbent UV-360
[CAS# 103597-45-1]

Identification

• Classification: Catalysts and additives >> UV absorber
• Name: Ultraviolet Absorbent UV-360
• Synonyms: Bisoctrizole; 2,2'-Methylenebis(6-(benzotriazol-2-yl)-4-tert-octylphenol); 2,2'-Methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol
• Molecular Formula: C₄₁H₅₀N₆O₂
• Molecular Weight: 658.87
• CAS Registry Number: 103597-45-1
• EC Number: 403-800-1
• SMILES: CC(C)(C)CC(C)(C)C1=CC(=C(C(=C1)N2N=C3C=CC=CC3=N2)O)CC4=C(C(=CC(=C4)C(C)(C)CC(C)(C)C)N5N=C6C=CC=CC6=N5)O

Properties

• Solubility: 35 mg/mL (CHCl3) (Expl.)
• Density: 1.2±0.1 g/cm³, Calc.^*
• Melting point: 197-199 °C (Expl.)
• Index of Refraction: 1.616, Calc.^*
• Boiling Point: 771.6±70.0 °C (760 mmHg), Calc.^*
• Flash Point: 420.5±35.7 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H413
• Safety Statements: P273-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413

Discovery and Applications

Ultraviolet Absorbent UV-360, chemically known as 2-(2-Hydroxy-3,5-di-tert-pentylphenyl)benzotriazole, was discovered in the mid-20th century as a highly effective UV stabilizer. Its structure consists of a benzotriazole moiety linked to a phenolic group, providing a strong capacity to absorb ultraviolet radiation in the UV-A and UV-B range. This capacity makes it an essential component in protecting materials and products from photodegradation caused by prolonged exposure to sunlight.

The development of UV-360 was driven by the demand for advanced stabilization methods in polymers and coatings, industries that were experiencing rapid growth. Unlike earlier UV stabilizers, UV-360 offered exceptional resistance to high temperatures and chemical reactions, making it compatible with thermoplastic and thermosetting polymers. This property was particularly beneficial for applications involving outdoor exposure, such as automotive coatings, construction materials, and synthetic fibers.

UV-360 functions primarily by absorbing UV light and dissipating the absorbed energy as harmless heat. This prevents UV radiation from breaking molecular bonds within materials, which can cause discoloration, brittleness, and reduced mechanical properties. The substance is often used in polyolefins, polycarbonates, polyesters, and polyurethanes, extending the lifespan and aesthetic appeal of these materials.

Applications of UV-360 are diverse. In the automotive industry, it is incorporated into clear coats to maintain the gloss and color of vehicles under intense sunlight. It is also widely used in outdoor furniture and building materials to protect surfaces from fading and degradation. Additionally, UV-360 plays a crucial role in the stabilization of synthetic fibers, ensuring durability and performance in textiles exposed to sunlight. Its high compatibility and performance have led to its integration into blends with other stabilizers, enhancing overall efficiency.

The discovery and application of UV-360 mark a significant advancement in material science, addressing critical challenges in product longevity and environmental resistance. Its adoption continues to expand as industries increasingly demand materials capable of enduring harsh environmental conditions.

References

2016. The Chemistry of Ultraviolet Filters. Principles and Practice of Photoprotection.
DOI: 10.1007/978-3-319-29382-0_9

2024. Topical Sunscreening Agents. Sunscreens for Skin of Color.
DOI: 10.1007/978-981-97-3195-4_8

2024. Sunscreen Challenges: Stability, Systemic Absorption, and Environmental Concerns. Sunscreens for Skin of Color.
DOI: 10.1007/978-981-97-3195-4_11