Description

4-[4-[2-(4-Hydroxy-3,5-Ditert-Butyl-Phenyl)Sulfanylpropan-2-Ylsulfanyl]-2,6-Ditert-Butyl-Phenoxy]-4-Oxo-Butanoic Acid is a high-performance, sulfur-containing phenolic antioxidant and acid synergist designed for advanced polymer stabilization. This compound is critical for enhancing the long-term thermal and oxidative stability of sensitive materials, preventing premature degradation and extending product service life. It is primarily needed by formulators and manufacturers in the plastics, synthetic rubber, lubricant, and adhesive industries who require robust protection against heat and oxygen-induced breakdown.

Application

• Polymer Stabilization: Primary antioxidant and acid scavenger in polyolefins (PP, PE), engineering plastics, and synthetic rubbers to prevent thermal-oxidative degradation during processing and end-use.
• Lubricant & Fuel Additive: Used in advanced lubricating oils, greases, and industrial fuels to inhibit oxidation, reduce sludge formation, and protect metal surfaces.
• Adhesive & Sealant Formulations: Enhances the durability and shelf-life of hot-melt adhesives, polyurethane systems, and other polymer-based sealants.
• Elastomer Protection: Critical for stabilizing SBR, BR, NBR, and EPDM rubber against heat aging, maintaining elasticity and mechanical properties.
• Synergistic Blends: Often used in combination with other antioxidants (e.g., phosphites, hindered amines) to create synergistic stabilization packages with superior performance.
• Wire & Cable Insulation: Protects the polymer insulation in electrical cables from long-term thermal exposure.

Basic Information

Product Name	4-[4-[2-(4-Hydroxy-3,5-Ditert-Butyl-Phenyl)Sulfanylpropan-2-Ylsulfanyl]-2,6-Ditert-Butyl-Phenoxy]-4-Oxo-Butanoic Acid
CAS No.	216167-82-7
Molecular Formula	C₃₅H₅₂O₅S₂
Molecular Weight	616.91 g/mol
Synonyms	4-Oxo-4-[4-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]thio]-1-methyl-1-[(2,6-bis(1,1-dimethylethyl)-4-hydroxyphenyl)thio]propoxy]butanoic acid; 4-[4-[2-(4-Hydroxy-3,5-di-tert-butylphenyl)thio-1-methylethylthio]-2,6-di-tert-butylphenoxy]-4-oxobutanoic acid; Butanoic acid, 4-[4-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]thio]-1-methyl-1-[(2,6-bis(1,1-dimethylethyl)-4-hydroxyphenyl)thio]propoxy]-4-oxo-; Sulfur-bridged phenolic antioxidant; Thioether-based phenolic acid.
EINECS	Contact for details

Quality Control

Our production of 4-[4-[2-(4-Hydroxy-3,5-Ditert-Butyl-Phenyl)Sulfanylpropan-2-Ylsulfanyl]-2,6-Ditert-Butyl-Phenoxy]-4-Oxo-Butanoic Acid adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure compliance with agreed specifications and industry standards. Comprehensive Certificates of Analysis (COA) documenting all critical parameters are provided and available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat sources, strong oxidizing agents, and incompatible materials. Due to its light-sensitive nature, the container should be opaque or stored in darkness.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
Sulfur Content	Conforms to theoretical value

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