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ChemWhat®1499437 CAS 1877301-52-4

ChemWhat®1499437 CAS 1877301-52-4

In Key Products, Other Performance Products, Performance Chemicals, Products, UV Absorbers

Identification

CAS Number

1877301-52-4

Name

2-(tert-Butyl)-4-methyl-6-(5-(p-tolylthio)-2H-benzo[d][1,2,3]triazol-2-yl)phenol

Synonyms

ChemWhat®1499437
5-(4-methyl-phenylthio)-2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-2H-benzotriazole

SMILES

CC1=CC(C(C)(C)O)=C(C=C1)n2nnc3cc(SC4=CC=C(C)C=C4)ccc23

StdInChI

InChI=1S/C24H23N3OS/c1-16-7-9-17(10-8-16)29-21-12-11-20-22(13-21)27-25-26(20)23-14-18(2)15-19(24(3,4)28)6-5-23/h5-15,28H,1-4H3

StdInChIKey

PAKNCPQVDCBQJQ-UHFFFAOYSA-N

Molecular Formula

C24H25N3OS

Molecular Weight

403.548

Properties

Appearance

Light yellow crystalline powder

Melting point

135.0 ~ 145.0℃

Safety Data

RIDADR 

NONH for all modes of transport

Specifications and Other Information of Our ChemWhat®1499437 CAS 1877301-52-4

Introduction

Blue Light Absorber ChemWhat 1499437 is a highly efficient, red-shifted benzotriazole-based light absorber. Derived from the structural backbone of the classic product UV-326, it has been optimized through a conjugation modification involving the introduction of a p-tolylthio group at the 5-position.

Properties

  1. Red-Shifted, Narrow-Band Absorption & Sharp Cut-Off
    Compared with conventional benzotriazole absorbers (λmax ~340–350 nm), ChemWhat 1499437 exhibits a significant red shift with an absorption maximum around 365 nm. The 5-position thioether modification provides an exceptionally sharp absorption profile: spectral scanning shows 0% transmittance at 390 nm and nearly 100% transmittance at 430 nm. This enables precise blocking of harmful high-energy visible blue light, especially within the 400–420 nm range.
  2. High Visible Light Transparency & Low Yellowing
    While delivering excellent UV and blue-light shielding performance, polymer substrates can still maintain a total light transmittance of ≥87%. Unlike conventional red-shifted absorbers, ChemWhat 1499437 rapidly becomes fully transparent beyond 430 nm, resulting in extremely low background coloration and meeting stringent optical requirements for low Yellowing Index (Y.I.).
  3. High Thermal Stability & Extremely Low Volatility
    The 5% weight-loss temperature (TGA) exceeds 280°C, making it highly suitable for high-temperature melt processing applications such as PC and PET extrusion, injection molding, and film stretching. Its higher molecular weight combined with the unique aryl thioether structure effectively suppresses sublimation, significantly reducing mold deposits, die build-up, and vacuum line blockage during production.
  4. Excellent Compatibility & Solubility
    The optimized steric hindrance and aryl thioether structure provide outstanding solubility and compatibility in a wide range of polar and non-polar resins, including PC, PMMA, PET, and optical monomer systems such as CR-39 and MR series materials. Long-term use helps prevent precipitation, migration, haze increase, or surface whitening.
  5. Outstanding Weather Resistance (High Light Fastness)
    The robust benzotriazole backbone enables efficient energy dissipation through the Excited-State Intramolecular Proton Transfer (ESIPT) mechanism, significantly delaying substrate yellowing, degradation, and gloss loss under prolonged light exposure.

Known Application

Widely used in high-end optical and electronic materials requiring strict UV and high-energy blue-light blocking performance:

  1. Optical Lenses
    Blue-light-blocking eyewear, functional resin lenses (CR-39, MR-8 systems), and contact lenses.
    Recommended dosage: 0.1% – 0.8%
  2. Display Protection Films
    PET screen protective films, optical clear adhesives (OCA), and polarizer protective layers for smartphones and display panels.
    Recommended dosage: 0.5% – 2.0%
  3. Functional Coatings & Window Films
    Premium automotive window films, architectural window films, and high-end UV-curable functional coatings.
    Recommended dosage: 1.0% – 3.0%

Identification Methods

HNMR, HPLC

Purity

98.5% min

Water

≤0.2%

Volatile Matter

≤ 1.0%

Transmittance

390 nm: 0.0% (Completely blocked)
430 nm: ≥98.0% (Almost completely transparent)

Shelf Life

2 years

Package

25 kg / Fiber drum or carton, lined with double-layer PE plastic bags.

Storage

Under room temperature away from light

General View of Documents

HPLC of Blue Light Absorber WI-623 CAS 1877301-52-4
HPLC of ChemWhat®1499437 CAS 1877301-52-4
Spectral Scan Curve of Blue Light Absorber WI-623 CAS 1877301-52-4
Spectral Scan Curve of ChemWhat®1499437 CAS 1877301-52-4

This product is developed by our R&D company Watson International Ltd (https://www.watson-int.com/).