Description

3,3',5,5'-Tetraisopropylbiphenyl-4,4'-Diol CAS NO 2416-95-7 is a sterically hindered biphenyl derivative, widely recognized as a high-performance antioxidant and polymerization inhibitor. Its molecular structure provides exceptional stability, making it a critical additive for protecting materials from thermal and oxidative degradation. This compound is essential for manufacturers in the polymer, lubricant, and specialty chemical industries seeking to enhance product longevity and performance under demanding conditions.

Application

• Polymer Stabilizer: Acts as a highly effective antioxidant and heat stabilizer in polyolefins (e.g., PP, PE), engineering plastics, and synthetic rubbers to prevent chain scission and discoloration during processing and end-use.
• Lubricant & Fuel Additive: Used as an antioxidant additive in industrial lubricants, greases, and fuels to inhibit oxidation, reduce sludge formation, and extend service life.
• Polymerization Inhibitor: Employed to control unwanted polymerization during the storage, transport, and distillation of monomers such as styrene, acrylates, and other vinyl compounds.
• Intermediate for Advanced Materials: Serves as a key building block (monomer or chain extender) in the synthesis of high-performance polymers, including polycarbonates, polyesters, and liquid crystalline polymers.
• UV Stabilizer Synergist: Works in conjunction with primary UV absorbers and HALS (Hindered Amine Light Stabilizers) in coatings and plastics to provide enhanced weatherability.
• Adhesive & Sealant Formulations: Incorporated to improve the thermal-oxidative stability of hot-melt adhesives, epoxy resins, and polyurethane systems.
• Electronic Chemicals: Used in the formulation of encapsulants and potting compounds for electronic components to ensure long-term reliability.
• Research & Development: Utilized in academic and industrial R&D as a model compound for studying antioxidant mechanisms and developing new stabilizer systems.

Basic Information

Product Name	3,3',5,5'-Tetraisopropylbiphenyl-4,4'-Diol
CAS No.	2416-95-7
Molecular Formula	C24H34O2
Molecular Weight	354.53 g/mol
Synonyms	4,4'-Dihydroxy-3,3',5,5'-tetraisopropylbiphenyl; Tetraisopropylbiphenyldiol; TIPB-diol; Biphenyl-4,4'-diol, 3,3',5,5'-tetraisopropyl-; Phenol, 4,4'-(1-methylethylidene)bis[2,6-bis(1-methylethyl)-; Antioxidant TIPB; Hindered Biphenyl Antioxidant
EINECS	219-328-2

Quality Control

Our production of 3,3',5,5'-Tetraisopropylbiphenyl-4,4'-Diol adheres to stringent quality management systems. Every batch undergoes comprehensive analytical testing, including HPLC for purity, GC for residual solvents, and IR for structural confirmation, to ensure consistency and compliance with customer specifications. Certificates of Analysis (COA) detailing all test results are provided with each shipment and are available upon request.

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 sources and incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.5%
Melting Point	155 - 160 °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.