Description

5,7-Bis(1,1-Dimethylethyl)-3-Phenyl-(3H)-Benzofuran-2-One is a specialized organic compound belonging to the benzofuranone class, valued for its role as a high-performance light stabilizer and antioxidant in polymer science. Its molecular structure is engineered to effectively scavenge free radicals and inhibit photo-oxidative degradation, thereby extending the service life and maintaining the aesthetic properties of sensitive materials. This product is essential for formulators and manufacturers in the plastics, coatings, and synthetic fiber industries seeking to enhance the durability of their products against environmental stressors.

Application

• Primary use as a light stabilizer (HALS - Hindered Amine Light Stabilizer synergist) in polyolefins such as polypropylene (PP) and polyethylene (PE).
• Critical component in advanced antioxidant packages for engineering plastics and thermoplastic elastomers to prevent thermal and oxidative degradation during processing and use.
• Protective additive in industrial and automotive coatings, lacquers, and varnishes to prevent yellowing, gloss loss, and cracking from UV exposure.
• Stabilizer for synthetic fibers and adhesives to improve weatherability and color fastness.
• Used in the stabilization of hydrocarbon-based fluids and lubricants to extend their operational lifespan.
• Intermediate in the synthesis of more complex polymer additives and specialty organic molecules.

Basic Information

Product Name	5,7-Bis(1,1-Dimethylethyl)-3-Phenyl-(3H)-Benzofuran-2-One
CAS No.	66737-86-8
Molecular Formula	C24H30O2
Molecular Weight	350.50 g/mol
Synonyms	3-Phenyl-5,7-di-tert-butylbenzofuran-2(3H)-one; 5,7-Di-tert-butyl-3-phenyl-3H-benzofuran-2-one; 3H-Benzofuran-2-one, 5,7-bis(1,1-dimethylethyl)-3-phenyl-; PDBBF; Phenyldi-tert-butylbenzofuranone; Light Stabilizer 2-one; Antioxidant 66737-86-8
EINECS	Contact for details

Quality Control

Our production of 5,7-Bis(1,1-Dimethylethyl)-3-Phenyl-(3H)-Benzofuran-2-One adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC, GC, and NMR, to ensure high purity and consistent performance. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all specification parameters. Our quality system is designed to meet the exacting standards of the polymer additive industry, ensuring reliability for your critical formulations.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat, open flames, and incompatible materials. The product is light-sensitive and should be stored in its original amber container or equivalent light-protective packaging.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.5%
Melting Point	148 - 152 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

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