2-(2H-BENZOTRIAZOL-2-YL)-4,6-DI-tert-PENTYLPHENOL

PRODUCT IDENTIFICATION
CAS NO.

25973-55-1

BENZOTRIAZOLE ANTI UV 328 

EINECS NO.

247-384-8

FORMULA C22H29N3O
MOL WT.

351.49

H.S. CODE 2933.99.8090
TOXICITY

Oral rat LD50: 5000 mg/kg

SMILES

 

SYNONYMS 2-(3,5-Di-tert-pentyl-2-hyroxyphenyl) benzotriazole;
2-(2H-Benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)phenol; UV Absorber 328; Tinuvin®-328;

SMILES

 n1(c2c(c(cc(c2)C(CC)(C)C)C(CC)(C)C)O)nc2ccccc2n1

CLASSIFICATION

Benzotriazole, UV Absorber, Light stabilizer

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE

Slightly yellowish powder

MELTING POINT

80 - 83 C

BOILING POINT  
SPECIFIC GRAVITY

1.17

SOLUBILITY IN WATER

Insoluble (0.015 mg/l at 25 C)

AUTOIGNITION  
pKa (Dissociation Constant at 20 C)
log Pow 7.25 (Octanol-water)
VAPOR PRESSURE 1.93E-10 (mmHg at 25 C)
HENRY'S LAW 6.52E-13 (atm-m3/mole at 25 C)
OH RATE 1.58E-11 (cm3/molecule-sec at 25 C Atmospheric )
VAPOR DENSITY  
NFPA RATINGS  

REFRACTIVE INDEX

  
FLASH POINT

229 C

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION & EXTERNAL LINKS

UV Absorber 328 has phenolic benzotriazole moiety and two substrates (tert-amylphenol) present on the phenolic group at 3,5 position. Phenolic Benzotriazole structure imparts important role in polymer and coating industry as UV absorbers, Light stabilizers. UV absorbers reduce or prevent the absorption of UV light by chromophores which in an excited state can form radicals that may have damaging effects on materials or alter their properties. UV Absorber 328 provides effective light stabilization and prevents yellowing and degradation of polymers such as polyurethanes, polyvinylchloride, unsaturated polyester and styrenics.

http://botkinchemie.com/
Ultraviolet (UV) absorbers act largely by shielding the interior of the part from damaging UV radiation. Before the advent of hindered amines, light stabilization was accomplished with systems based on UV absorbers in combination with other additives. Today UV absorbers are often used in combination with HALS and sometimes other additives for the stabilization of polypropylene. They are also used in plastic packaging applications to provide content protection. All of the compounds of this class share several general characteristics:

    1. Strong UV absorption, especially in the 290 nm to 350 nm range which is very damaging to organic materials, and

    2. Excited states formed upon UV absorption relax to the ground state extremely rapidly (picosecond time frame) and efficiently via radiation-less processes, which imparts high efficiency and excellent photostability.

Chemical classes of UV absorbers suitable for use in polyolefins include 2-hydroxybenzophenones (e.g.UVA-1), 2-(2-hydroxyphenyl)-2H-benzotriazoles (e.g. UVA-2, UVA-3), tris-aryl-o-hydroxyphenyl-striazines (e.g. UVA-4), and cyanoacrylate derivatives (e.g. UVA-5, UVA-6). Chemical structures of representative UV absorbers are given in the Appendix. For food contact applications, products that have been designated as food contact compliant in polypropylene by the US FDA include UVA-1, UVA-3, UVA-4, and UVA-6.........
SALES SPECIFICATION

APPEARANCE

 Slightly yellowish powder
ASSAY 99.0 min

MELTING POINT

80 C min

VOLATILES

0.5% max

TRANSMITTANCE

95.0% (460nm), 97.0% (500nm)

TRANSPORTATION
PACKING 20kg in fiber drum 
HAZARD CLASS  
UN NO.

 

OTHER INFORMATION

1,2,3-Benzotriazole: Benzene ring-fused azole compounds; white to off-white crystalline powder; insoluble in water, soluble in ethanol, melting at 98.5 C. Azole is a five-membered heterocycle compound containing unsaturated bonds and Nitrogen atoms. Triazole has three nitrogens. 1,2,3-Benzotriazole (1H-benzotriazole) has -N=N- bond whereas 2H-Benzotriazole has two -C=N- bonds. Benzotriazole is a parent material to produce UV-absorbers. Benzotriazole and its derivatives are versatile intermediates involved in the production of:

  • Corrosion Inhibitors
  • Anti-fading agent for metals
  • Antiseptic and Anticoagulant agent
  • Anti-fog for photograph
  • UV-absorbers
  • Anti-freeze Agent
  • Photoconductor
  • Copying systems
  • Pharmaceuticals, pesticide products and other specialty chemicals