LOTSORB UV 384-2 (CAS:127519-17-9, 108-65-6 )

Product Description 

Lotsorb UV 384-2 is a liquid UV absorber of the hydroxyphenylbenzotriazole class developed for  coatings. It’s very high thermal stability and environmental permanence makes it suitable  for coatings exposed to high bake cycles and/or extreme environmental conditions. It has  been designed to fulfill the high performance and durability requirements of automotive and  industrial high-quality finishes. Its broad UV absorption allows efficient protection of light  sensitive base coats or substrates such as wood and plastics.

Key Features & Benefits

- Versatile hydroxyphenyl-benzotriazole UVA for use solvent based coatings

- Excellent spectral coverage in the UV region

- Excellent photopermanence and thermal stability

CAS number                                                         

127519-17-9, 108-65-6 

Molecular weight                                               

451.6 

Chemical Structure

Lotsorb UV 384-2 is: 95% Benzenepropanoic acid, 3-(2H-benzotriazol-2-yl)-5-(1, 1-dimethylethyl)- 4-hydroxy-, C7-9-branched and linear alkyl esters, 5% 1-methoxy-2-propyl acetate

Properties  Typical

Properties

Appearance                                                         pale yellow liquid

Dynamic Viscosity at 20 °C           cps                 3,200

Density at 20 °C                            g/cm³            1.0718 

Miscibility (g/100 g solution) at 20 °C:

butanol                                                                > 30 

butylcarbitol                                                        > 30 

ethyl glycol acetate                                             > 30 

butyl glycol acetate                                            > 30 

methyl ethyl ketone                                            > 30 

1-methoxypropylacetate-2                                 > 30 

Solvesso 100¹                                                      > 30 

Solvesso 150¹                                                      > 30 

n – hexane                                                           > 30 

water                                                                   < 0.01 ¹

Transmittance Spectrum (in toluene, cell thickness 1 cm)

Top Line: 0.001% Lotsorb UV 384-2, corresponds to 0.25% in a 40 µ film 

Second Line: 0.002% Lotsorb UV 384-2, corresponds to 0.50% in a 40 µ film 

Third Line: 0.004% Lotsorb UV 384-2, corresponds to 1.0% in a 40 µ film 

Bottom Line: 0.006% Lotsorb UV 384-2, corresponds to 1.5% in a 40 µ film

Applications 

Lotsorb UV 384-2 is recommended for: 

• Automotive coatings 

• General industrial applications i.e. coil coatings, wood coatings

The liquid form of Lotsorb UV 384-2 provides easy incorporation into solvent borne systems. The performance provided by Lotsorb UV 384-2 can be enhanced when used in combination with a  HALS stabilizer such as Lotsorb UV 292, Lotsorb UV 249 or Lotsorb UV 123. These combinations improve the  durability of clear coats by inhibiting or retarding the occurrence of failures such as gloss reduction,  cracking, color change, blistering and delamination. The amount of Lotsorb UV 384-2 required for  optimum performance should be determined in laboratory trials covering a concentration range.

Recommend Concentrations

Lotsorb  UV 384-2                                                                                        1.0 – 3.0 % 

Lotsorb  UV 123, Lotsorb UV 249 or Lotsorb UV 292                                   0.5 – 2.0 %

 (concentrations are based on weight percent binder solids)

Packaging and handling 

Packaging: 25Kg/Drum    

Store the product in a cool, dry, well-ventilated area away from incompatible materials. Unless stated, proper storage will permit usage of the product for 12 months from the manufacture date. For additional handling and toxicological information, consult the Material Safety Data Sheet.