Solvent Black 27

· C.I. Index No.: C.I. Solvent Black 27

· CAS No.: [3861-74-1] / [12237-22-8] (may vary by isomer or salt form)

· Chemical Class: Anthraquinone-based solvent dye

· Appearance: Typically a dark blue to black powder or solid.

Structure & Properties

· Structure: It is a derivative of the 1-amino-4-arylaminoanthraquinone class. Its molecular structure contains the anthraquinone chromophore, with specific substituents (like arylamino groups) that fine-tune its solubility in organic solvents and its shade.

· Solubility: Insoluble in water, but readily soluble in a wide range of organic solvents, including:

· Aromatic hydrocarbons (benzene, toluene, xylene)

· Halogenated hydrocarbons (chloroform, dichloromethane)

· Ketones (acetone, methyl ethyl ketone)

· Esters

· Certain higher alcohols and oils.

· Shade: Imparts a blue-black to black color in solution.

Primary Applications

Due to its excellent solvent solubility and stability, Solvent Black 27 is primarily used for coloring non-aqueous systems:

1. Plastics Coloring: Particularly suitable for coloring polystyrene (PS), polymethyl methacrylate (PMMA/acrylic), polycarbonate (PC), and other engineering plastics. It provides a deep, transparent black shade.

2. Ink Industry: Used in the manufacture of various solvent-based inks, such as gravure printing inks, flexographic printing inks, and metal decoration inks.

3. Resins & Coatings: Used for coloring lacquers, resin products, and other coating materials that require dissolution in organic solvents.

4. Others: Also used for coloring waxes, greases, shoe polishes, etc.

Safety & Regulatory Status

· Toxicity: As a chemical, inhalation of dust and contact with skin and eyes should be avoided. Specific toxicity data should be consulted from its Safety Data Sheet (SDS).

· Environment: It is not readily biodegradable and may be toxic to aquatic organisms. Use and disposal must comply with local environmental regulations.

· Regulatory Status: It is not one of the classic "banned azo dyes" (those that cleave to release carcinogenic aromatic amines). However, its production and use must comply with chemical management frameworks like the EU REACH regulation. There may be restrictions for specific uses or in certain regions.

Distinction from Similar Products

· vs. Solvent Black 7: Solvent Black 7 (C.I. Solvent Black 7) is typically an azo-based black solvent dye, whereas Solvent Black 27 is anthraquinone-based. Anthraquinone dyes generally offer superior light and heat fastness but at a higher cost.

· vs. Carbon Black: Carbon black is an inorganic pigment, colored by physical dispersion. It is usually opaque and conductive. Solvent Black 27 is an organic dye that dissolves at a molecular level, providing a transparent or translucent black color and is non-conductive.

Summary

Solvent Black 27 is a high-performance, anthraquinone-based black solvent dye, valued for its excellent lightfastness, heat resistance, solubility, and transparency. Its primary applications are in high-quality plastics (e.g., PS, PMMA) and solvent-based inks, where demanding color performance and stability are required. Safe handling practices and environmental regulations must be observed during its use.

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