Description

[4-[[(2-Hydroxyphenyl)Azo]Methylene]-2,2,3,5,5-Pentamethylimidazolidin-1-Yloxy]Radical is a specialized, stable nitroxide radical compound, also known as a hindered amine light stabilizer (HALS) precursor. This high-purity intermediate is critical for synthesizing advanced polymer additives that protect materials from degradation caused by UV light and thermal oxidation. It is essential for manufacturers in the polymer, coatings, and specialty chemical industries seeking to enhance the durability and lifespan of their products.

Application

• Polymer Stabilization: Serves as a key synthetic intermediate for producing high-performance hindered amine light stabilizers (HALS) used in plastics and synthetic fibers.
• Coatings & Paints: Used in the formulation of UV-resistant additives for automotive, industrial, and architectural coatings to prevent chalking, gloss loss, and color fading.
• Advanced Material Research: Acts as a spin label or radical trap in spectroscopic studies and the development of novel functional materials.
• Antioxidant Synergist: Works in conjunction with primary antioxidants to provide superior long-term thermal stabilization for polyolefins and engineering plastics.
• Adhesives & Sealants: Incorporated to improve the weatherability and prevent the embrittlement of adhesive films exposed to outdoor conditions.

Basic Information

Product Name	[4-[[(2-Hydroxyphenyl)Azo]Methylene]-2,2,3,5,5-Pentamethylimidazolidin-1-Yloxy]Radical
CAS No.	78943-42-7
Molecular Formula	C₁₇H₂₄N₄O₂
Molecular Weight	316.40 g/mol
Synonyms	4-[(2-Hydroxyphenyl)hydrazonomethyl]-2,2,3,5,5-pentamethyl-1-oxoimidazolidin-1-yl; 1-Oxyl-4-[[(2-hydroxyphenyl)azo]methylene]-2,2,3,5,5-pentamethylimidazolidine; HALS Intermediate; Nitroxide Radical Derivative; TEMPO-type Radical; Azomethine Nitroxide; Light Stabilizer Precursor; Polymer Additive Intermediate
EINECS	Contact for details

Quality Control

Our production of [4-[[(2-Hydroxyphenyl)Azo]Methylene]-2,2,3,5,5-Pentamethylimidazolidin-1-Yloxy]Radical adheres to strict quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation via spectroscopic methods, to ensure consistency and meet the high standards required for industrial synthesis. Certificates of Analysis (COA) documenting all critical parameters are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C/59-77°F) under an inert atmosphere (e.g., nitrogen or argon) to minimize oxidation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Orange to red crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.