PIGMENT YELLOW 170

Pigment Yellow 170 is an organic yellow pigment primarily used in plastics, coatings, inks, and paints due to its bright yellow shade, good lightfastness, and weather resistance.
CAS Number: 5280-68-2

Synonyms:
PY 170,CI Pigment Yellow 170,C.I. 18480,Benzimidazolone Yellow H6G,Benzimidazolone Yellow 170,3,3'-Dichlorobenzidine Bis(2,4-dioxo-1H-benzo[d][1,3]oxazine-6-carboxamide),Permanent Yellow H6G,Disazo pigment yellow 170

Introduction
Pigment Yellow 170 (PY170) is an organic pigment classified within the diarylide group, renowned for its bright yellow color and excellent performance characteristics in a wide range of applications. Structurally based on the benzidine coupling of acetoacetarylide derivatives, PY170 offers a vibrant hue, high tinting strength, and stability under various conditions. 
Since its development, it has played a vital role in the formulation of high-performance colorants for industrial and commercial use.

The increasing demand for pigments with enhanced durability, environmental safety, and compatibility with diverse substrates has highlighted the importance of PY170. 
As a non-soluble, organic compound, it provides superior resistance to solvents, light, and heat, making it a preferred choice in applications such as automotive coatings, printing inks, plastics, and architectural paints.

Chemical Identity
IUPAC Name: Benzenesulfonic acid, 4-[[2,5-dimethoxy-4-[(4-nitrophenyl)azo]phenyl]azo]-3-hydroxy-, calcium salt
CAS Number: 65300-02-5
Molecular Formula: C30H32CaN6O8S2
Molecular Weight: ~728.82 g/mol
The molecular structure of PY170 includes an azo linkage (-N=N-) between aromatic rings, contributing to its intense color. 
The presence of electron-donating and electron-withdrawing groups further tunes its optical properties.

Synthesis and Manufacturing
The synthesis of Pigment Yellow 170 typically involves diazotization of a substituted aromatic amine followed by coupling with a diarylide component. The general process includes:
Step 1: Diazotization – An aromatic amine such as 4-nitroaniline is diazotized using sodium nitrite and hydrochloric acid at low temperatures.
Step 2: Coupling Reaction – The diazonium salt is reacted with an acetoacetanilide derivative to form the azo compound.
Step 3: Isolation and Precipitation – The pigment is isolated by filtration, washed, and dried.
Modifications in synthesis, such as the use of specific substituents, pH control, and temperature optimization, affect pigment properties like particle size, dispersibility, and color shade.

Physicochemical Properties
Appearance: Bright yellow powder
Density: ~1.5–1.7 g/cm³
Melting Point: Decomposes before melting
Thermal Stability: Stable up to 200°C
Lightfastness: Excellent
Solubility: Insoluble in water and most organic solvents
Oil Absorption: ~40–60 g/100g
pH Stability: Stable in pH 4–9 range
These properties make PY170 suitable for applications where stability under harsh conditions is essential.

Spectroscopic and Analytical Data
UV-Vis Spectroscopy: Strong absorption peak at ~420 nm
Infrared (IR) Spectroscopy: Peaks for aromatic C=C stretches (~1600 cm^-1), N=N (~1500 cm^-1), and sulfonate groups (~1040 cm^-1)
NMR Spectroscopy: Characteristic aromatic proton signals; complex due to multiple environments
Mass Spectrometry (MS): Molecular ion peak consistent with molecular weight
These data support structural confirmation and quality assessment.

Crystallography and Solid-State Properties
PY170 typically exists in a crystalline or partially crystalline form, which influences its dispersibility and color strength. 
The solid-state characteristics include:
Crystal System: Monoclinic or triclinic (varies by grade)
Particle Morphology: Rod-like or platelet structures
Surface Area: Typically 5–20 m²/g depending on milling
Aggregation: Can form agglomerates; treated with dispersants to improve application

Application Areas
Paints and Coatings: Used in architectural and automotive paints for its durability and lightfastness.
Plastics: Incorporated into polyolefins, PVC, and engineering plastics without migration.
Printing Inks: Used in solvent-based and water-based systems; compatible with flexographic, gravure, and offset printing.
Textiles: Applicable in pigment printing for fibers.

Performance Characteristics
Weather Resistance: Excellent, particularly in automotive and outdoor applications
Migration Resistance: High; suitable for plastic formulations
Dispersibility: Good, especially with surface-treated grades
Tinting Strength: High
Opacity: Moderate to high depending on formulation

SAFETY INFORMATION ABOUT PIGMENT YELLOW 170
 
First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product