2,4-DI-tert-BUTYL-6-(5-CHLOROBENZOTRIAZOL-2-YL)PHENOL

PRODUCT IDENTIFICATION

3864-99-1

223-383-8

C₂₀H₂₄ClN₃O

Oral rat LD50: 5000 mg/kg

2-(5-Chloro-2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)-phenol; 2(3',5'-Di-tert-butyl- 2'-hydroxyphenyl)  -5-chlorobenzotriazole; 2-(2'-Hydroxy-3',5'-di-t-butylphenyl)- 5-chlorobenzotriazole; Other RN: 60712-40-5; 102257-29-4; 106085-69-2; 114625-87-5; 153613-74-2; 188025-33-4; 189456-66-4; 796971-90-9;

SMILES

Oc1c(cc(cc1n1nc2c(cc(cc2)Cl)n1)C(C)(C)C)C(C)(C)C

CLASSIFICATION

Benzotriazole, UV Absorber, Light stabilizer

PHYSICAL AND CHEMICAL PROPERTIES

Slightly yellowish powder

154 -158 C

1.26

Insoluble

REFRACTIVE INDEX

GENERAL DESCRIPTION & EXTERNAL LINKS

UV Absorber 327 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 327 [ 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-5-chloro-2H- benzotriazole] provides effective light stabilization and prevents the yellowing and edgradation of polymers such as polypropylene, high density polyethylene, unsaturated polyester, styrene-based thermoplastic elastomer, polyamide, acrylonitrile butadienc styrene, impact polystyrene, polyvinylidenchloride, chloropride, cyhloroprene rubber.

The main hydroxyphenylbenzotriazole UV Absorbers include:

• 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole (CAS NO. 2440-22-4, Drometrizole, UV Absorber-P)
• 2-(2'-Hydroxy-5'-tert-octylphenyl)benzotriazole (CAS NO. 3147-75-9, Octrizole, UV Absorber-329)
• 2-(3',5'-Di-tert-butyl-2'-hydroxyphenyl)-5-chloro-2H-benzotriazole (CAS NO. 3864-99-1, UV Absorber-327)
• 2-(2-Hydroxy-3-tert-butyl-5-methylphenyl)-5-chloro-2H-benzotriazole (CAS NO. 3896-11-5, Bumetrizole, UV Absorber-326)
• 2-(3,5-Di-tert-pentyl-2-hyroxyphenyl) benzotriazolee (CAS NO. 25973-55-1, UV Absorber-328)
• 2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (CAS NO. 70321-86-7, UV Absorber-234)

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.........

APPEARANCE

MELTING POINT

154 C min

VOLATILES

0.5% max

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