Dioxazine Yellow 12 Pigment for Plastic Coating and Painting - Excellent Stability for Coatings

Introduction to Pigment Yellow 12

Pigment Yellow 12 (PY 12), classified under the Color Index (C.I.) system as C.I. Pigment Yellow 12, is a high-performance organic pigment widely recognized for its vibrant yellow hue and exceptional stability. As a diarylide-based pigment, it belongs to the disazo yellow pigment family, which is known for its strong tinting strength, excellent lightfastness, and resistance to heat and solvents. This pigment is primarily utilized in printing inks, plastics, coatings, and water-based inks, where its superior brilliance and transparency are highly valued.

Physical and Chemical Properties

Pigment Yellow 12 is typically supplied as a fine yellow powder with a specific gravity ranging between 1.30 and 1.50, indicating a moderate density that facilitates uniform dispersion in various mediums. Its bulk volume is reported to be between 3.4 and 3.8 liters per kilogram (l/kg), which influences its handling and packaging requirements.

One of the defining characteristics of PY 12 is its particle size distribution, which typically falls within the range of 50 to 150 nanometers (nm). This fine particle size contributes to its high transparency, making it particularly suitable for applications where clarity and color purity are essential, such as in flexographic and gravure printing inks.

Key Performance Attributes

1. Color Strength and Brilliance

   • PY 12 exhibits exceptionally high dyeing force, meaning a relatively small amount of pigment is required to achieve intense coloration.

   • Its high brilliance ensures a clean, bright yellow shade, free from dullness or muddiness, which is crucial for applications requiring vivid visual impact.

2. Heat Resistance

   • The pigment demonstrates stable performance at temperatures up to 180°C (356°F), making it suitable for processes involving heat, such as plastic extrusion and industrial coatings.

3. Migration Resistance

   • PY 12 possesses low migration tendencies, meaning it does not readily bleed or transfer when in contact with other materials. This property is particularly important in plastic laminates and packaging inks, where color stability is critical.

4. Lightfastness and Weather Resistance

   • While not as durable as some inorganic pigments, PY 12 offers moderate lightfastness, making it suitable for indoor applications where prolonged UV exposure is not a concern.

5. Chemical Stability

   • It is resistant to water, oils, and many organic solvents, ensuring compatibility with a broad range of ink and coating formulations.

Primary Applications

1. Printing Inks

Pigment Yellow 12 is extensively used in offset and solvent-based inks due to its high transparency and strong color yield. Its ability to maintain stability under mechanical stress (such as during printing) makes it a preferred choice for:

• Sheet-fed and web offset inks

• Flexographic and gravure inks

• Packaging inks (food-safe compliant grades available)

2. Plastics and Polymers

When incorporated into plastics, PY 12 (often marketed as Corimax Yellow GOP) provides consistent coloration without affecting polymer properties. It is recommended for:

• Polyethylene (PE) and polypropylene (PP) films

• PVC products (e.g., vinyl flooring, cables)

• Injection-molded plastic parts

3. Water-Based Inks

Due to advancements in pigment dispersion technology, PY 12 can now be effectively used in eco-friendly, water-based ink systems, meeting regulatory demands for low-VOC (volatile organic compound) formulations.

4. Coatings and Paints

While not as common as in inks, PY 12 is sometimes used in industrial and decorative coatings where a bright yellow shade is required.

Comparison with Other Yellow Pigments

Pigment Yellow 12 is often compared to other yellow pigments, such as:

• Pigment Yellow 13 (PY 13) – Similar in structure but with slightly greener undertones.

• Pigment Yellow 14 (PY 14) – Offers higher opacity but lower transparency.

• Inorganic alternatives (e.g., Cadmium Yellow, Chrome Yellow) – While inorganic pigments provide better heat and UV resistance, they are heavier, less transparent, and face regulatory restrictions due to heavy metal content.

Regulatory and Safety Considerations

PY 12 is generally regarded as safe for use in food-contact applications (where approved) and complies with major regulatory standards, including:

• REACH (EU)

• FDA (USA, for indirect food contact)

• EN 71-3 (Toy safety standards)

However, as with all chemical substances, proper handling (including dust control) is recommended to minimize inhalation risks.

Market Variants and Brand Names

Different manufacturers produce Pigment Yellow 12 under various trade names, including:

• Corimax Yellow GOP (for plastics)

• Novoperm Yellow 12 (high-performance grades)

• Graphtol Yellow 12 (for inks and coatings)

Each variant may have slight modifications in particle size or surface treatment to optimize performance for specific applications.

Future Trends and Innovations

With increasing demand for sustainable and non-toxic pigments, research is ongoing to enhance PY 12’s environmental profile, including:

• Bio-based dispersants for water-based inks

• Nano-encapsulation to improve weatherability

• Recyclable pigment formulations for circular economy compliance

Conclusion

Pigment Yellow 12 remains a versatile and cost-effective choice for industries requiring a bright, stable yellow pigment with excellent transparency and color strength. Its balance of performance characteristics ensures continued relevance in printing, plastics, and coatings, while ongoing innovations aim to expand its applications in eco-friendly formulations.

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