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Benzotriazole Based Ultraviolet Absorbers

PowerSorb™ 329

2-(2'-hydroxy-5'-tert-octylphenyl) benzotriazole .
Synonym: 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol
Chemical Structure
Introduction / Features
PowerSorb™ 329 is a benzotriazole type ultraviolet light absorber (UVA), imparting good light stability for plastics and other organic polymers.
Physical Properties
Chemical Name: 2-(2'-hydroxy-5'-tert-octylphenyl) benzotriazole
CAS No.: 3147-75-9
EINECS No.: 221-573-5
Formula: C20H25N3O
Molecular Weight: 323
Specific Gravity[25°C]: 1.18
Melting Point(°C): 102-106
Volatile Loss(%): Max.0.5
Color of Solution 460nm(%): Min.97
Color of Solution 500nm(%): Min.98
Appearance: white powder
Ash(%): Max.0.1
Min. Purity: 99%

Solubility (20°C) % w/w
3-A Alcohol: 0.7
Benzene: 65
n-Butanol: 2
Dioctyl phthalate: 15
Ethanol: 0.6
Ethyl acetate: 27.2
n-Heptane: 8.1
Methyl cellosolve: 5
Methylene Chloride: 70.9
Methyl methacrylate: 12
Styrenel: 22
Xylene: 50
Water: <0.01

Applications
PowerSorb™ 329 protects polymers from UV radiation, helping to preserve the original appearance and physical integrity of molded articles, films, sheets and fibers during outdoor weathering.
PowerSorb™ 329 provides effective light stabilization and prevents the yellowing and degradation of polymers such as polycarbonate, unsaturated polyesters, and acrylics. PowerSorb™ 329 can be used in combination with phenolic & phosphite antioxidants, and HALS to optimize performance in outdoor use.
Packings
PowerSorb™ 329 is supplied in 25kg carton box.
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