UV absorber-928
- CAS NO.:73936-91-1
- Empirical Formula: C29H35N3O
- Molecular Weight: 441.61
- MDL number: MFCD11114451
- EINECS: 422-600-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-04-28 19:50:54
What is UV absorber-928?
Chemical properties
light yellow crystalline powder
What are the applications of Application
UV-928 has broad absorption properties which can effectively protect coating and other photosensitive materials.The product has high solubility, high temperature resistant and good environmental durability and so on..It is suitable for high performance coatings, especially suitable for powder coating and industrial and automotive coatings. UV-928 can be enhanced when used in combination with a HALS stabilizer such as UV-292 or UV-123.
What are the applications of Application
UV absorber-928(Tinuvin 928) is a UV absorber of the hydroxyphenyl benzotriazole class developed specially for high
performance coating applications. Its characteristic broadband absorption provides efficient
protection to coatings and light sensitive substrates. Its excellent solubility and high thermal and
environmental permanence makes it particularly suitable for coatings exposed to high temperature
curing processes, such as powder and coil coatings, or high environmental stress. Tinuvin 928 is recommended for applications such as:
automotive coatings
powder and coil coatings
hot melt adhesives
exterior construction coatings (roofing, etc.)
construction adhesives and sealants
Flammability and Explosibility
Not classified
Synthesis
In a dry argon atmosphere 0.150 g of oxime 5, 0.070 g of 1,2-phenylene diamine 1 and 0.150
ml triethyl-borate are dissolved in 4 ml dry THF and heated for 24 h at 60°C. After a TLC
shows consumption of starting oxime the mixture is evaporated to dryness and the resulting
residue purified by column chromatography (eluent: hexane - ethyl acetate: 10-1 vol/vol) to
give 0.171 g (92 %) of the diazo-amine intermediate 6.
Replacing the B(OEt)3 by 2.5 g of basic AI2O3 and the THF by 2 ml of xylene and heating this
mixture to 140°C for 48 h gives after the usual work-up 0.089 mg of diazo compound 6 and
0.300 g of starting oxime 5.
According the procedure given for the preparation of compound 4 in example 1, triazole 7 is
obtained from 0.007 g (0.016 mmol) of intermediate amine 6 and 0.020 g (0.122 mmol) CuSO4
in 100% (0.007 g). In this comparative example, 7.73 equivalents of copper salt are used.
Properties of UV absorber-928
Melting point: | 112 °C |
Boiling point: | 555.5±60.0 °C(Predicted) |
Density | 1.07 |
solubility | soluble in Toluene |
form | powder to crystal |
pka | 8.05±0.50(Predicted) |
color | White to Orange to Green |
InChI | InChI=1S/C29H35N3O/c1-27(2,3)19-28(4,5)21-17-22(29(6,7)20-13-9-8-10-14-20)26(33)25(18-21)32-30-23-15-11-12-16-24(23)31-32/h8-18,33H,19H2,1-7H3 |
EPA Substance Registry System | Phenol, 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)- (73936-91-1) |
Safety information for UV absorber-928
Computed Descriptors for UV absorber-928
InChIKey | UZUNCLSDTUBVCN-UHFFFAOYSA-N |
SMILES | C1(O)=C(C(C)(C2=CC=CC=C2)C)C=C(C(C)(C)CC(C)(C)C)C=C1N1N=C2C=CC=CC2=N1 |
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