TINUVIN 234

Tinuvin 234 is used in hotmelt, solvent based, reactive and radiation curing adhesives and sealants for molded articles, films, sheets and fibers. 
Tinuvin 234 protects organic polymers as well as pigments from UV light, improving and preserving the technical and visual performance of such applications.
Tinuvin 234 is a benzotriazole ultraviolet light absorber (UVA) designed to impart excellent light stability to a variety of polymers. 

CAS Number: 2440-22-4
Molecular Formula: C13H11N3O
Molecular Weight: 225.25
EINECS Number: 219-470-5

Synonyms: Drometrizole, 2440-22-4, 2-(2-HYDROXY-5-METHYLPHENYL)BENZOTRIAZOLE, 2-(2H-Benzotriazol-2-yl)-4-methylphenol, Drometrizol, 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole, Phenol, 2-(2H-benzotriazol-2-yl)-4-methyl-, Drometrizolum, DTXSID1027479, 5X93W9OFZL, NSC-91885, DTXCID207479, 219-470-5, RefChem:590441, 607-063-9, Benazol P, 2-(2H-Benzotriazol-2-yl)-p-cresol, Tinuvin P, 2-(2H-benzo[d][1,2,3]triazol-2-yl)-4-methylphenol, 2-(2-Benzotriazolyl)-p-cresol, UV Absorber-1, Tin P, Porex P, 2-Benzotriazolyl-4-methylphenol, 2240-22-4, UV-P, 2-(benzotriazol-2-yl)-4-methylphenol, 2-(2-Hydroxy-5-methylphenyl)-2H-benzotriazole, p-Cresol, 2-(2H-benzotriazol-2-yl)-, Ultraviolet Absorbent UV-P, NSC 91885, MFCD00022903, 2-Benzotriazol-2-yl-4-methyl-phenol, 2-(2H-1,2,3-Benzotriazol-2-yl)-4-methylphenol, 2-(2'-Hydroxy-5-methylphenyl)benzotriazole, NCGC00166243-01, benazol II, Tinuvin II, Drometrizole [USAN:INN], Drometrizolum [INN-Latin], CAS-2440-22-4, Drometrizol [INN-Spanish, French], EINECS 219-470-5, UNII-5X93W9OFZL, BRN 0615546, BenazolP, Uvazol P, Lowilite 55, Topanex 100BT, UV-P (drometrizole), Drometrizole (Standard), DROMETRIZOLE [MI], ChemDiv2_000180, Drometrizole (USAN/INN), DROMETRIZOLE [INN], DROMETRIZOLE [USAN], EC 219-470-5, NCIOpen2_005624, SCHEMBL15616, DROMETRIZOLE [MART.], MLS000713327, DROMETRIZOLE [USP-RS], DROMETRIZOLE [WHO-DD], CHEMBL1564747, SCHEMBL11462292, SCHEMBL11594636, SCHEMBL29046137, SCHEMBL29350665, MCPKSFINULVDNX-UHFFFAOYSA-, MSK3457, CHEBI:134926, HMS1369I04, HMS2650F14, 2-(2H-bentriazol-2-yl)-p-cresol, NSC91885, Tox21_112369, Tox21_200876, Tox21_303578, WLN: T56 BNNNJ CR BQ E1, BBL013151, STK096143, (BENZOTRIAZOL-2-YL)-P-CRESOL, AKOS000369894, Tox21_112369_1, CCG-103301, HY-131551R, NCGC00166243-02, NCGC00166243-03, NCGC00257391-01, NCGC00258430-01, 2(2'hydroxy5'-methylphenyl)benzotriazole, AC-11259, AS-12550, DA-52699, MSK3457-1000, SMR000272808, 4-methyl-2-(2H-benzotriazol-2-yl)phenol, o-[2H-benzotriazol-2-yl)-4-methylphenol, phenol, 2-(benzotriazol-2-yl)-4-methyl-, 2-(2-hydroxy-5-methylphenyl) benzotriazole, 2-(2H-benzotriazol-2-yl)-4-methyl-phenol, 2-(2h-benzotriazole-2-yl)-4-methylphenol, DB-226477, DB-226478, HY-131551, 2-(2-hydroxyl-5-methylphenyl) benzotriazole, CS-0136496, EU-0000279, H0560, NS00010695, ST50271127, 2-(2'-hydroxy-5'-methylphenyl) benzotriazol, 2-(2-hydrobenzotriazol-2-yl)-4-methylphenol, 2-(2'-hydroxy-5'-methylphenyl) benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)-benzotriazole, D03913, 2-(2'-Hydroxy-5-methylphenyl)2H-benzotriazole, 2-(2-Hydroxy-5-methylphenyl)benzotriazole, 97%, AE-641/02338040, F238745, SR-01000390735, 3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl methane, SR-01000390735-1, 2-(2H-1,2,3-Benzotriazol-2-yl)-4-methylphenol #, Q27263002, Drometrizole, United States Pharmacopeia (USP) Reference Standard, 2-(2-Hydroxy-5-methylphenyl)benzotriazole Solution in Methanol, 1000 μg/mL, InChI=1/C13H11N3O/c1-9-6-7-13(17)12(8-9)16-14-10-4-2-3-5-11(10)15-16/h2-8,17H,1H3.(2'-Hydroxy-5mg-methylphenyl) benzotriazole;2-(2H-Benzotriazol-2-yl)-p-cresol(UV-P);TinuvinP/2-(2H-Benzotriazol-2-yl)-p-cresol;LOTSORB UV P;2-(2H-1,2,3-Benzotriazol-2-yl)-4-methylphenol;2-(2h-benzotriazol-2-yl)-4-methyl-pheno;2-(2h-benzotriazol-2-yl)-p-creso;2-(2-hydroxy-5-methyl-phenyl)-2H-benzotriazole

Tinuvin 234 is an ultraviolet light absorber (UVA) of the hydroxyphenyl benzotriazole class, imparting good light stability to a wide variety of polymers.
Tinuvin 234 is chemically phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl) grade. 
Tinuvin 234 is a high molecular weight product belonging to hydroxyphenyl benzotriazole class.

Tinuvin 234 imparts excellent light stability to a variety of polymers.
Features low volatility, exceptional light absorbing characteristics and good compatibility in various substrates.
Tinuvin 234 makes the product particularly suitable for applications characterized by high surface area, such as films and fibers.

Suitable for polycarbonates, polyalkylene terephthalates, polyacetals, polyamides, polyphenylene sulfide, polyphenylene oxide, aromatic copolymers, thermoplastic polyurethane and polyurethane fibers, as well as for polyvinylchloride, styrene homo- and copolymers.
Applications include molded articles, films, sheets and fibers.
Tinuvin 234 ranges between 0.15 and 0.60%, depending on substrate and performance requirements of the final application.

Tinuvin 234 is a high molecular weight ultraviolet light absorber (UVA) of the hydroxy phenyl benzotriazole class. 
Possesses features such as low volatility, very good light absorbing characteristics and good compatibility in various substrates. 
It provides low volatility, exceptional light absorbing characteristics and good compatibility in various substrates making it particularly suitable for applications characterized by high surface area, such as films and fibers. 

Tinuvin 234 is a high-performance ultraviolet (UV) absorber belonging to the benzotriazole family, developed to protect polymers, coatings, and other materials from UV-induced degradation.
It is a yellowish powder with low volatility and strong absorption in the UV-A and UV-B regions, typically between 300 and 400 nanometers.
This compound is chemically stable at high processing temperatures and compatible with a wide range of thermoplastic and thermoset materials.

The molecular structure of Tinuvin 234 includes aromatic rings and benzotriazole groups that allow it to capture harmful UV energy efficiently.
Once absorbed, the UV energy is harmlessly dissipated as heat, preventing photo-oxidation and chain scission in the polymer backbone.
This mechanism maintains the strength, elasticity, and transparency of materials that would otherwise become brittle, discolored, or cracked over time.

Tinuvin 234 is widely used in engineering plastics such as polycarbonate, polyester, polyamide, and polyphenylene sulfide.
In these materials, it provides long-term protection against yellowing, surface chalking, and loss of mechanical properties caused by prolonged sunlight exposure.
Because of its thermal stability, it can withstand high-temperature molding processes without decomposing or evaporating.

In coatings, paints, and sealants, Tinuvin 234 is used to extend color retention and gloss, especially in automotive and architectural finishes.
It helps prevent fading, cracking, and loss of transparency in clear coats and plasticized layers exposed to outdoor conditions.
When combined with antioxidants or hindered amine light stabilizers (HALS), it provides synergistic protection for maximum weathering resistance.

The compound is also applied in the production of optical films, fibers, and transparent packaging materials.
It helps preserve optical clarity and minimizes haze formation in thin layers subjected to continuous light exposure.
Because of its very low volatility, it remains stable during extrusion and film-forming operations, ensuring consistent performance throughout the product’s lifetime.

Tinuvin 234 is a high-performance ultraviolet absorber that belongs to the benzotriazole family of stabilizers.
It is an advanced organic compound that protects polymers, coatings, and adhesives from degradation caused by ultraviolet radiation.
This protection is achieved through its ability to absorb high-energy UV light and convert it into harmless heat, thereby preventing photo-oxidation and polymer chain scission.

The molecular design of Tinuvin 234 features aromatic rings and benzotriazole groups that give it strong UV-absorbing properties across the 300–400 nm wavelength range.
Its high thermal stability allows it to be processed under elevated temperatures without decomposition or evaporation, making it suitable for demanding industrial applications.
Because of its low volatility and migration resistance, the additive remains within the polymer matrix, providing long-term and consistent protection.

Tinuvin 234 is most commonly used in engineering plastics such as polycarbonate, polyester, polyamide, and polyphenylene sulfide.
It prevents discoloration, embrittlement, and loss of transparency that typically occur after extended UV exposure.
These properties make it indispensable for outdoor and optical components, including automotive parts, films, lenses, and transparent sheets.

In coatings and surface finishes, Tinuvin 234 helps maintain gloss, color stability, and mechanical strength under sunlight and weathering conditions.
It is frequently incorporated into automotive coatings, architectural paints, and clear lacquers to prevent fading, cracking, and chalking.
When combined with hindered amine light stabilizers, it provides synergistic protection, ensuring the long-term preservation of surface aesthetics and flexibility.

The compound also plays an essential role in the production of high-performance fibers and films.
It protects synthetic fibers such as nylon and polyester from UV-induced degradation that can cause weakening, fading, or reduced elasticity.
In optical and packaging films, it helps maintain transparency and mechanical integrity even under continuous light exposure.

Melting point : 125.5–129.5 °C (lit.)
Boiling point : bp10 225°
Density : 1.38
Vapor pressure : 0 Pa at 20℃
Refractive index : 1.5600 (estimate)
Flash point : 54°C
Storage temperature : 15–25°C
Solubility : DMSO (Slightly), Methanol (Slightly)
Form : Solid
pKa : 8.15 ± 0.43 (Predicted)
Color : Off-White to Pale Yellow
Water solubility : 173 μg/L at 20℃
Merck : 14,3447
Stability : Hygroscopic
InChIKey : MCPKSFINULVDNX-UHFFFAOYSA-N
LogP : 4.2 at 25℃

Tinuvin 234 features a strong absorption of ultraviolet radiation in the 300-400 nm region. 
It also has a high degree of photostability over long periods of light exposure. 
The high absorbance combined with photostability and the ability to release absorbed energy in non sensitizing ways make Drometrizole an effective stabilizer against the effects of ultraviolet light.

Tinuvin 234 is a high molecular weight ultraviolet light absorber (UVA) of the hydroxyphenyl benzotriazole class, imparting excellent light stability to a variety of polymers.
Tinuvin 234 is also utilized in electronic, aerospace, and marine applications where materials are exposed to harsh UV radiation.
It protects sensors, housings, and structural polymers that require exceptional durability and dimensional stability.

Its chemical resistance and non-reactivity make it compatible with many resins, curing agents, and additive systems.
The compound typically appears as a pale yellow crystalline powder with high purity and stability.
It is insoluble in water but readily dissolves in organic solvents such as acetone, toluene, and ethyl acetate.

This solubility profile allows for easy incorporation into coatings, films, or resin formulations during processing.
From a chemical standpoint, Tinuvin 234 is an efficient stabilizer that interrupts the photo-degradation cycle by scavenging reactive radicals generated by UV exposure.
It functions as a passive shield that prevents oxidation of polymer chains, thus preserving molecular weight and tensile strength.

As a result, materials retain their flexibility, clarity, and toughness for significantly longer periods.
Because of its performance reliability, Tinuvin 234 is widely adopted in industrial production lines that require outdoor durability and long service life.
It provides consistent UV protection in molded, extruded, or coated products without altering their optical properties.

This combination of stability, efficiency, and compatibility makes it one of the most trusted additives for polymer protection.
In summary, Tinuvin 234 serves as a powerful and versatile UV absorber that safeguards materials from photochemical aging and color deterioration.
Its ability to withstand high-temperature processing, resist migration, and provide durable UV screening ensures extended material performance.

Through its application in plastics, coatings, and composites, Tinuvin 234 contributes to the longevity, safety, and appearance of products across multiple industries.
The use levels of Drometrizole range between 0.10% and 0.50%, depending on substrate and performance requirements of the final application. 
Drometrizole can be used alone or in a variety of blends and combinations with Ciba IRGAFOS, Ciba IRGANOX and Ciba CHIMASSORB stabilizers where often a synergistic performance is observed. 

Tinuvin 234 may react with various heavy metal ions to form salts or complexes. 
For example, if Drometrizole comes into contact with iron or cobalt ions, colored complexes are formed. 
Reducing and oxidizing agents used in polymerization and curing processes have no effect on the stability of Drometrizole.

Tinuvin 234 is particularly valued for use in high-performance industries such as aerospace, automotive, and electronics.
It protects components like polycarbonate lenses, light covers, and molded housings from photodegradation and discoloration.
This enhances both the aesthetic and functional lifespan of products exposed to intense sunlight or artificial UV sources.

The compound is typically used at concentrations ranging from 0.15 % to 0.60 % depending on the polymer type and environmental conditions.
It can be added directly during compounding or incorporated through masterbatch formulations to ensure uniform dispersion.
Proper dosing is essential to achieve optimal UV protection without affecting mechanical or optical properties.

Physically, Tinuvin 234 appears as a light yellow crystalline powder that is insoluble in water but soluble in organic solvents such as acetone, toluene, and ethyl acetate.
It is non-volatile, non-hygroscopic, and maintains its activity even after prolonged exposure to heat and light.
Its chemical robustness ensures consistent performance under harsh weathering or processing conditions.

In summary, Tinuvin 234 acts as a powerful UV shield for materials requiring long-term durability, clarity, and color stability.
Its efficient UV absorption, low migration tendency, and compatibility with diverse substrates make it a preferred additive in advanced polymer systems.
By preventing photochemical damage, Tinuvin 234 helps extend the service life and appearance of plastics, coatings, and composites across multiple industries.

Uses Of Tinuvin 234:
Tinuvin 234 provides ultraviolet protection in a wide variety of polymers including styrene homoand copolymers, engineering plastics such as polyesters and acrylic resins, polyvinyl chloride, and other halogen containing polymers and copolymers (e.g. vinylidenes), acetals and cellulose esters. 
Elastomers, adhesives, polycarbonate blends, polyurethanes, and some cellulose esters and epoxy materials also benefit from the use of Drometrizole.
Tinuvin 234 is primarily used as a high-efficiency ultraviolet absorber to protect polymers, coatings, and other materials from degradation caused by UV radiation.

Tinuvin 234 is designed to prevent color fading, surface cracking, and loss of mechanical strength in materials exposed to outdoor or high-intensity light conditions.
Its long-term stability and low volatility make it suitable for high-performance applications that require durable UV protection.
In the plastics industry, Tinuvin 234 is widely used in engineering polymers such as polycarbonate, polyamide, polyester, and polyphenylene sulfide.

It prevents yellowing, brittleness, and loss of transparency that occur in these materials when exposed to sunlight or artificial UV light.
Because it remains stable under high processing temperatures, it is ideal for molded parts, optical lenses, and transparent sheets.

In automotive and aerospace sectors, Tinuvin 234 is used in coatings, clear films, and plastic components exposed to extreme environmental conditions.
It preserves the appearance, color, and surface smoothness of vehicle exteriors and interior trims by reducing photodegradation.
The additive also enhances the weathering resistance of transparent polycarbonate headlights, instrument panels, and coatings on metallic surfaces.

The compound is also extensively employed in architectural coatings and outdoor paints where long-lasting color retention and gloss are essential.
It helps prevent fading and chalking in clear lacquers, varnishes, and decorative coatings used on metal, wood, and composite materials.
When combined with hindered amine light stabilizers (HALS), it provides synergistic protection against both UV and thermal degradation.

In optical films and packaging materials, Tinuvin 234 ensures high light stability without compromising clarity.
It is used in transparent films for electronic displays, solar panels, and protective packaging where resistance to UV light is critical.
Its low migration tendency ensures that it remains embedded in the film, maintaining optical quality throughout the product’s lifespan.

In the textile and fiber industry, Tinuvin 234 is applied to synthetic fibers such as nylon, PET, and acrylic to improve UV resistance.
It prevents fading and loss of strength caused by sunlight exposure, particularly in outdoor fabrics and industrial textiles.
This makes it valuable in applications such as awnings, ropes, nets, and upholstery materials used in marine and automotive environments.

Tinuvin 234 also finds use in adhesives, sealants, and elastomers that require long-term stability and flexibility.
It maintains color uniformity and prevents cracking or embrittlement caused by UV exposure.
This protection ensures consistent performance in bonding and sealing applications that face sunlight and weather fluctuations.

In electronics and optical devices, Tinuvin 234 is incorporated into transparent housings, displays, and light guides.
It protects sensitive components from UV-induced degradation that can alter light transmission or mechanical strength.
The additive ensures long-term functionality and clarity in devices used outdoors or under strong artificial lighting.

In marine and outdoor applications, Tinuvin 234 is used in coatings and composites that face intense sunlight, humidity, and salt exposure.
It minimizes surface erosion and helps maintain gloss and strength in boat hulls, decks, and outdoor furniture.
Because of its water resistance and strong UV absorption, it offers superior protection in highly corrosive environments.

In conclusion, Tinuvin 234 is a versatile UV stabilizer used in plastics, coatings, films, fibers, adhesives, and composites across multiple industries.
Its role in preventing UV-induced degradation ensures longer service life, better color retention, and improved performance of materials under harsh light exposure.
By combining durability, thermal stability, and low migration, it remains one of the most effective and widely used UV absorbers in modern material technology.

An ultraviolet light absorber for stabilizing plastics and other organic materials against discoloration and deterioration.
Benzotriazole UV absorbers with a blocked hydroxy group for us in UV curable paint
Maleimide-bound benzotriazole monomer to use for emulsion polymerization

Tinuvin 234 is an UV adsorber for use in plastics, cosmetics, dental materials, acrylic materials, dyes, etc.
Tinuvin 234 is an intermediate reactant in the synthesis of UV light absorbers for polyester fibers.

Safety Profile Tinuvin 234:
In accordance with good industrial practice, handle with care and avoid unnecessary personal contact. 
Prevent contamination of the environment, avoid dust formation and ignition sources.
Tinuvin 234 is considered a low-to-moderate hazard additive but should still be handled with care due to its chemical composition and fine particulate form.

In its solid powder state, it can cause mild irritation to the eyes, skin, and respiratory system if handled without proper protection.
While it is not acutely toxic or classified as a carcinogen, repeated or improper exposure may lead to localized discomfort or sensitization.

When the compound comes into contact with the skin, it may cause mild dryness or irritation, especially after prolonged handling.
The irritation is primarily due to the organic aromatic components that can slightly de-fat or dry out the skin.
To minimize contact, users should wear protective gloves and wash thoroughly after handling.

Eye exposure to Tinuvin 234 dust can lead to temporary irritation, redness, or a burning sensation.
Because the powder can be easily dispersed into the air during mixing or weighing, goggles or face shields should be worn at all times.
If eye contact occurs, rinsing with clean water for several minutes is recommended to prevent inflammation.

Inhalation of Tinuvin 234 dust or fine particulates may irritate the respiratory passages.
Symptoms can include coughing, throat dryness, or mild breathing discomfort in poorly ventilated spaces.
Adequate ventilation or the use of a dust mask during handling can prevent respiratory irritation and ensure worker safety.

Ingestion of the compound is not intended and may cause mild gastrointestinal upset such as nausea or stomach irritation.
Although the compound is considered of low oral toxicity, accidental ingestion should be avoided by following good laboratory and manufacturing hygiene practices.
If swallowed, medical advice should be sought, and vomiting should not be induced.