67845-93-6

Basic information

• Product Name: Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate
• Synonyms: UV Absorber 2908;HRsorb-2908;3,5-bis(1,1-dimethylethyl)-4-hydroxy-benzoicacihexadecylester;Benzoicacid,3,5-bis(1,1-dimethylethyl)-4-hydroxy-,hexadecylester;Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate;HEXADECYL 3,5-DI-TERT-BUTYL-4-HYDROXYBENZOATE;3,5-Bis[1,1-dimethylethyl]-4-hydroxybenzoic acid hexadecyl ester;3,5-DI-TERT-BUTYL-4-HYDROXYBENZOIC ACID HEXADECYL ESTER
• CAS NO: 67845-93-6
• Molecular Formula: C31H54O3
• Molecular Weight: 474.76
• EINECS: 267-342-2
• Mol File: 67845-93-6.mol
• Article Data: 0

Chemical Properties

• Melting Point: 59-61 °C(lit.)
• Boiling Point: 539.2 °C at 760 mmHg
• Flash Point: 191.3 °C
• Appearance: white crystalline powder
• Density: 0.936 g/cm³
• Vapor Pressure: 3.07E-12mmHg at 25°C
• Refractive Index: 1.488
• Storage Temp.: Inert atmosphere,Room Temperature
• Solubility: DMSO (Slightly), Ethyl Acetate (Slightly)
• PKA: 9.07±0.40(Predicted)
• Water Solubility: 10μg/L at 20℃
• CAS DataBase Reference: Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate(CAS DataBase Reference)
• NIST Chemistry Reference: Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate(67845-93-6)
• EPA Substance Registry System: Hexadecyl 3,5-bis-tert-butyl-4-hydroxybenzoate(67845-93-6)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26-36
• WGK Germany: 3
• RTECS: DG4436220
• Hazardous Substances Data: 67845-93-6(Hazardous Substances Data)

Usage

Physical properties

It is white to faint yellow powder. The specific gravity is 1.07 at 25℃. It is easy soluble in toluene, chloroform, hexane, soluble in acetone etc.

Uses

Different sources of media describe the Uses of 67845-93-6 differently. You can refer to the following data:
1. The product belongs to the class of hindered hydroxybenzoate light stabilizer. UV-2908 is most suitable for the protection of polyolefins, polycarbonate and the systems containing flame retardants and thioesters. It can be used alone or in combination with benzophenone UV stabilizer or phosphite antioxidant, showing good synergistic effect.The dosage of UV-2908 ranges between 0.25% and 1% are recommended for protection. It depends on the substrate and performance requirement of the final application.
2. DXSORB 2908 is an excellent light stabilizer, low volatility, small coloring, good chemical stability, acid and alkali resistance. Suitable for PP and PE and other polyolefin plastics, the general dosage of 0.25 ~ 0.1%. This product can be used alone or in combination with benzophenone ultraviolet stabilizer or phosphite antioxidant, showing good synergistic effect.

benefits

Low volatility, minimal color contribution, good chemical stability, acid and alkali resistant, excellent compatibilty with UV absorbers, HALS, and thioesters, FDA sanctioned to 0.5% in polyolefins

Flammability and Explosibility

Notclassified

Safety

Different sources of media describe the Safety of 67845-93-6 differently. You can refer to the following data:
1. In accordance with good industrial practice, handle with care and avoid unnecessary personal contact. Avoid continuous or repetitive breathing of dust. UV Absorber 2908 is used only with adequate ventilation. Avoid dust formation and ignition sources.
2. In accordance with good industrial practice, handle with care and avoid unnecessary personal contact. Avoid continuous or repetitive breathing of dust. Use only with adequate ventilation. Avoid dust formation and ignition sources

Synthesis

1.Add 3,5-di-tert-butyl-4-hydroxybenzoic acid (3.03 g), 1-hexadecanol (4.42 g), toluene (30 ml) and dried ion-exchange resin (1.49 g, 20 wt%) into a two-necked round flask equipped with a magnetic stirrer for 11.5 hours.2.High performance liquid chromatography is adopted to monitor the reaction and determine the component of the reaction mixture.

InChI:InChI=1/C31H54O3/c1-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-34-29(33)25-23-26(30(2,3)4)28(32)27(24-25)31(5,6)7/h23-24,32H,8-22H2,1-7H3