2- (2 H -enzotriazol-2-yl) -4,6-di- tert -pentylphenol

Structural formula
General
Surname	2- (2 H -enzotriazol-2-yl) -4,6-di- tert -pentylphenol
other names	UV-328 Tinuvin 328
Molecular formula	C 22 H 29 N 3 O
Brief description	yellowish powder
External identifiers / databases
CAS number 25973-55-1 EC number 247-384-8 ECHA InfoCard 100,043,062 PubChem 33263 ChemSpider 30728 Wikidata Q27291918
properties
Molar mass	352 g mol −1
density	1.17 g cm −3
Melting point	80-86 ° C
Vapor pressure	4.6 10 −5 Pa (20 ° C)
solubility	<0.001 g l −1 (20 ° C)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 373-413 P: 260-273-311-501
Authorization procedure under REACH	of particular concern : persistent, bio-accumulative and toxic ( PBT ), very persistent and very bioaccumulative ( vPvB ); subject to approval
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

2- (2 H -Benzotriazol-2-yl) -4,6-di- tert -pentylphenol ( UV-328 ) is a chemical compound from the group of 2- (2-hydroxyphenyl) -2 H -benzotriazoles . It is a UV filter that is used as an anti-aging agent for plastic.

use

2- (2 H -Benzotriazol-2-yl) -4,6-di- tert -pentylphenol is a light stabilizer for a variety of plastics and other organic substrates. Its use is for the stabilization of styrene - homo- and - copolymers , acrylic polymers , unsaturated polyesters , polyvinyl chloride , polyolefins , polyurethanes , polyacetals, polyvinyl butyral , elastomers and adhesives recommended. It protects polymers and organic pigments from UV radiation and helps to maintain the original appearance and physical integrity of molded parts, films, sheets and fibers during outdoor weathering . The use concentration is 0.1–1%.

Use in vehicle paints , industrial coatings , commercial paints such as wood stains or do-it-yourself paints is also recommended.

Hazard and risk assessment

2- (2 H -benzotriazol-2-yl) -4,6-di- tert- pentylphenol was added to the candidate list in December 2014 because it is very persistent, very bioaccumulating and toxic. It was also proposed for inclusion in the Stockholm Convention .

In German waters it was found in sediments, suspended matter , livers of bream and in triangular clams .

Individual evidence

1. ↑ ^{a b c d} Anna Wypych: Databook of UV Stabilizers . Elsevier, 2015, ISBN 978-1-927885-03-1 , pp. 72 ( limited preview in Google Book search).
2. ↑ ^{a b c} Entry on 2- (2H-Benzotriazol-2-yl) -4,6-di-tert-pentylphenol in the GESTIS substance database of the IFA , accessed on February 8, 2018(JavaScript required) .
3. ↑ Entry in the SVHC list of the European Chemicals Agency , accessed on February 13, 2020.
4. ↑ Entry in the register of substances subject to authorization of the European Chemicals Agency , accessed on February 13, 2020.
5. ↑ Entry on 2- (2H-Benzotriazol-2-yl) -4,6-di-tert-pentylphenol at Toronto Research Chemicals , accessed on November 17, 2017 ( PDF ).
6. ↑ ^{a b} TINUVIN 328. Ciba, November 2008, accessed on November 18, 2018 . 
7. ↑ TINUVIN 328. Ciba, 9 December 1997, accessed on 18 November 2018 . 
8. ↑ Gunnar Minx: Federal Environment Agency - REACH. Retrieved November 14, 2018 . 
9. ↑ List of substances proposed as POP - ECHA. Accessed June 8, 2020 (German). 
10. ↑ Arne Wick, Björn Jacobs, Uwe Kunkel, Peter Heininger, Thomas A. Ternes: Benzotriazole UV stabilizers in sediments, suspended particulate matter and fish of German rivers: New insights into occurrence, time trends and persistency . In: Environmental Pollution . tape 212 , May 2016, p. 401-412 , doi : 10.1016 / j.envpol.2016.01.024 .
11. ↑ Arne Wick, Björn Jacobs, Thomas A. Ternes: Phenol-Benzotriazole in Samples of the Environmental Specimen Bank - Screening and Time Series . Ed .: Federal Institute for Hydrology . Koblenz 2016 ( Environment Samples Bank.de ).