Description

2,4-Bis(3,5-Ditert-Butyl-4-Oxo-2,5-Cyclohexadien-1-Ylidene)Cyclobutane-1,3-Dione is a high-performance, sterically hindered phenolic compound that functions as a highly effective light stabilizer and antioxidant. This specialized chemical is critical for protecting polymers and other sensitive materials from degradation caused by ultraviolet (UV) light and thermal oxidation. It is an essential additive for manufacturers in the plastics, coatings, and specialty chemical industries seeking to enhance the durability and longevity of their products under demanding environmental conditions.

Application

• Primary use as a light stabilizer (HALS - Hindered Amine Light Stabilizer synergist) in polyolefins such as polypropylene (PP) and polyethylene (PE).
• Key additive in automotive plastics and coatings to prevent color fading, surface cracking, and loss of mechanical properties.
• Stabilizer for agricultural films and greenhouse covers to extend service life under intense sunlight.
• Protective agent in engineering plastics (e.g., ABS, polyamide) used in outdoor applications and consumer electronics.
• Component in synthetic fibers and textiles to improve UV resistance.
• Additive for adhesives, sealants, and elastomers to enhance weatherability.
• Stabilizer in masterbatches and polymer concentrates for consistent additive dispersion.

Basic Information

Product Name	2,4-Bis(3,5-Ditert-Butyl-4-Oxo-2,5-Cyclohexadien-1-Ylidene)Cyclobutane-1,3-Dione
CAS No.	61377-20-6
Molecular Formula	C42H56O4
Molecular Weight	624.90 g/mol
Synonyms	2,4-Bis(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)cyclobutane-1,3-dione; 2,4-Bis(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)cyclobutane-1,3-dione; UV Absorber 61377-20-6; Light Stabilizer 61377-20-6; Phenolic Light Stabilizer; Bis(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)cyclobutane-1,3-dione
EINECS	Contact for details

Quality Control

Our production of 2,4-Bis(3,5-Ditert-Butyl-4-Oxo-2,5-Cyclohexadien-1-Ylidene)Cyclobutane-1,3-Dione adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for use in polymer stabilization. Certificates of Analysis (COA) documenting all critical parameters are available upon request, providing full traceability and quality assurance for your formulation needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is easily oxidized (store under inert atmosphere) and is light-sensitive (store away from light). Keep away from heat, sparks, and open flame. Isolate from incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Yellow to orange crystalline powder
Identification (IR)	Conforms to reference spectrum
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.