CAS 25973-55-1 Light Stabilizers Coatings 2-(2H-Benzotriazol-2-Yl)-4,6-Ditertpentylphenol Chiguard® 328
Chiguard® 328 CAS 25973-55-1
Description
| Structure |  |
| Chemical name |
2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol |
| CAS number |
25973-55-1 |
| Molecular formula |
C22 H29N3O |
| Molecular weight |
351.5 |
Physical property data
| Appearance | Off-white crystalline powder |
| Odor | Faint |
| Boiling point | > 300 ℃ |
| Melting point | 80 ℃ |
| Relative density | 1.17 @20 ℃ |
Solubility(Amount of grams soluble in 100 ml of solvent )
| Ethyl acetate | 20 |
| Ethanol | 0.6 |
| Methyl ethyl ketone | 24 |
| Mineral oil | 14 |
| Styrene | 34 |
| Water | Nil |
Specification
| Appearance | Light yellow crystalline powder |
| Purity | 99% min. |
| Melting point | 79 - 84 ℃ |
| Volatility | 0.5% max. |
| Penetration | 97% min. @460 nm/98% min. @500 nm |
Application
Chiguard® 328 has excellent yellowing resistance even after high temperature baking, so it is very suitable for adding to protective coatings. Chiguard® 328 has been widely used in the following fields:
1. Thermoplastic polyurethanes and related polyurethanes.
2. Two-component phenolic epoxy resins.
3. Thermosetting acrylic enamels.
4. Photosensitive films.
Recommended dosage of Chiguard® 328: 0.1% - 0.5%. If used with phenolic antioxidants (such as DEOX 10 and 76) and hindered amine light stabilizers (such as Chiguard® 770 and 944), the light stabilization performance of the polymer can be further improved.
UV Spectrum
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