Solvent Red 111

Basic Information

· Name: Solvent Red 111

· C.I. Index No.: C.I. Solvent Red 111 (Often described as the solubilized form of C.I. Pigment Red 122)

· CAS No.: [84632-65-5]

· Chemical Class: Quinacridone. Specifically, 2,9-dimethylquinacridone.

· Appearance: Vivid bluish-red (magenta shade) powder or granules.

Structure & Properties

1. Chemical Nature: Solvent Red 111 is essentially a specially processed or derivatized version of Pigment Red 122. This treatment enhances its compatibility, dispersion, or solubility in specific organic solvent or resin systems.

2. Shade: Provides a very intense, clean bluish-red (magenta tone) with extremely high color saturation.

3. Key Performance Advantages (inherited from quinacridone pigments):

· Exceptional Lightfastness: Highly stable under outdoor exposure, resistant to fading.

· Excellent Heat Resistance: Withstands high processing temperatures (typically >300°C).

· Good Migration Resistance: Does not easily bleed from the colored material into adjacent substrates or solvents.

· Good Chemical Resistance.

Primary Applications

Due to its outstanding durability, it is primarily used in high-performance applications:

1. High-Performance Plastics:

· Polycarbonate (PC): A classic application, used for electrical housings, automotive parts, etc.

· Polymethyl Methacrylate (PMMA/Acrylic)

· Polyamide (PA/Nylon)

· Polyoxymethylene (POM/Acetal)

· ABS, PS, and others.

· Especially suitable for plastic components requiring long-term outdoor use or exposure to high-temperature environments.

2. Automotive Coatings: Used in high-performance metallic paints, pearl effect basecoats, and solid shades due to its superb weatherability.

3. Industrial Coatings: For coatings with stringent requirements for light and weather resistance.

4. Solvent-Based Inks: Used in high-end packaging and outdoor advertising inks where weatherfastness is critical.

5. Mass Coloration of Synthetic Fibers: For melt-spinning of polyester or nylon (spin dyeing).

Safety & Regulatory Status

· Toxicity: Quinacridone compounds are generally considered to have low toxicity. However, as a fine chemical, inhalation of dust and prolonged skin contact should be avoided. Always consult its Safety Data Sheet (SDS) for handling.

· Environment & Regulations:

· Free of harmful heavy metals (e.g., lead, cadmium, chromium).

· Complies with stringent international regulations such as EU RoHS, REACH, and U.S. FDA (for certain food contact applications under specified conditions).

· Its high chemical stability makes it relatively environmentally benign, but waste disposal must follow regulations.

Distinction from Similar Products

· Relationship with "Pigment Red 122": This is the most critical distinction.

· Pigment Red 122: The standard pigment form. It is insoluble and colors through physical dispersion of fine particles. Mainly used in coatings, inks, and plastic masterbatches.

· Solvent Red 111: A solubilized or specially surface-treated form designed for better compatibility, transparency, or dispersion stability in specific non-aqueous systems. It can be thought of as "Pigment Red 122 optimized for solvent/resin systems."

· vs. Other Solvent Reds (e.g., SR 24, SR 26): Most other solvent reds are azo-based dyes. They are bright and cost-effective but offer far inferior light and heat fastness compared to the quinacridone-based SR 111. SR 111 is the choice for high-end applications.

Summary

Solvent Red 111 is a high-end, high-performance red colorant based on the quinacridone chemistry. It is not a traditional "solvent dye" in the classic sense but rather a high-performance pigment optimized for organic systems.

Its core value lies in:

· Top-Tier Durability: Combines vibrant color with light, heat, and weather resistance.

· Broad Applicability: Especially critical for engineering plastics and high-performance coatings/inks.

· Safety & Compliance: Meets the most stringent international product safety regulations.

Therefore, when an application has dual, stringent requirements for both the vibrancy and permanence of a red color (e.g., automotive parts, outdoor electronics, premium cosmetic packaging), Solvent Red 111 (the solubilized form of Pigment Red 122) is often the preferred solution, despite its typically higher cost compared to ordinary organic red dyes.

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