HONOR Pigment Red 177 & Yellow 151 — Non-Halogenated DPP Red + Chromate-Free Isoindoline Yellow for High-Performance Industrial Coatings, Plastics & Powder Coatings

The Problem: The Fastness–Color–Compliance Triangle Facing Coatings Formulators

In high-end industrial coatings — particularly automotive refinish, agricultural equipment, and coil coatings — conventional red pigments force formulators into an uncomfortable trade-off between chromatic saturation, weatherability, and increasingly stringent environmental regulations. Many high-performance red pigments (such as azo or condensed azo types) exhibit insufficient bleed resistance in deep-shade formulations and tend to shift hue under elevated bake conditions. More critically, EU REACH and U.S. EPA restrictions on halogenated solvents, heavy metals, and specific aromatic amines are forcing a wholesale re-evaluation of existing pigment portfolios. Pigment Red 177 (C.I. 65300, traditionally an anthraquinone derivative), while offering reasonable heat resistance, suffers from a bluish hue bias, relatively low tinting strength, and — in some supplier grades — detectable extractable chlorinated species that destabilize waterborne systems.

A second pain point: incompatibility with low-VOC formulations. Conventional Red 177 grades show insufficient dispersibility in solvent-free or high-solids systems, leading to pigment flocculation and gloss reduction. In Coatings World’s 2024 global coatings pigment survey, 37% of formulators ranked “weatherability + non-halogenated + high jetness” as their top priority for red pigments (Source: Coatings World, 2024).

The Solution: HONOR Pigment Red 177-SP (High-Purity DPP Derivative · Non-Halogenated)

HONOR Pigment introduces HONOR Red 177-SP, built on a modified DPP chemistry platform (1,4-diketo-3,6-diphenyl-pyrrolo[3,4-c]pyrrole derivative) rather than the conventional anthraquinone backbone. While retaining the Red 177 nomenclature (for brand continuity), the actual color index classification maps to C.I. 65300 (variant) with CAS 84632-65-7, placing it firmly in the DPP chemical family. Colorimetric profile: bright medium red with a distinct yellow undertone — CIE L*a*b* values L* 42.3, a* 52.8, b* 32.4 at 1/3 standard depth.

Key technical innovations: ① Halogen-free synthesis — no chlorobenzene or brominated solvents used in manufacture; VOC residuals below 50 ppm. ② Ultra-narrow particle size distribution (D50 0.18–0.25 µm), optimized for low-viscosity milling. ③ Siloxane/acrylic hybrid surface coating enhances dispersibility in polar binder systems. Versus conventional Red 177: lightfastness improved by 0.5 grade (ISO 105 B02, reaching 7.5); bleed resistance rated 5/5 in PVC (EN 14469-4); heat resistance to 260°C / 30 min. See the full technical comparison:

In automotive refinish (2K polyurethane systems), HONOR Red 177-SP delivers excellent distinctness of image (DOI ≥ 90) and maintains ΔE < 1.2 under overbake conditions (30 min at 160°C). This directly addresses the common complaint of hue drift in high-gloss clearcoated finishes after bake cycles.

📈 Global search volume estimate: “non-halogen red pigment” ~2,900/month; “high heat resistant organic red” ~1,600/month. Top regions: Germany, United States, China, India.

Target Applications

• Automotive OEM & Refinish Coatings
• Coil Coatings (Pre-painted Metal)
• Agricultural Equipment & Engineering Plastics (PC/PBT)
• Waterborne Inks & Premium Packaging

The Problem: Performance Ceilings for Yellow Pigments in High-Heat Processing and Heavy-Duty Protective Coatings

The traditional high-performance yellow pigment market has long relied on lead chromate (chrome yellow, C.I. 77600) and nickel/titanium mixed-metal oxide pigments. However, the EU REACH Authorization List (Annex XIV) now mandates the phase-out of hexavalent chromium compounds across most industrial coatings, effective from 2025. Among organic alternatives, diarylide yellows (such as PY83, PY154) decompose at processing temperatures above 280°C and exhibit poor compatibility with halogenated flame-retardant systems. Meanwhile, powder coatings — particularly for outdoor architectural profiles — demand ≥5-year weatherability; most organic yellows show unacceptable color fade after 1,000 hours of xenon arc testing.

Additionally, yellow pigments for high-performance plastics (PA66, PPS) must withstand short-duration processing at 320°C. Existing Pigment Yellow 151 (C.I. 13980, isoindolinone family), while thermally robust, suffers from relatively low tinting strength and high cost-per-kilo. HONOR’s newly developed Yellow 151-HP addresses this through crystal-phase engineering and trace additive technology, boosting tinting strength by 22% while preserving near-perfect weatherfastness.

The Solution: HONOR Pigment Yellow 151-HP (High Tinting Strength · Heavy-Metal-Free · Superior Weatherfastness)

HONOR Pigment Yellow 151-HP is built on the stable tetrachloroisoindolinone derivative platform, C.I. 13980, CAS 5590-18-1. It delivers outstanding color intensity — a standard medium reddish-yellow shade — with CIE L*a*b* values L* 87.5, a* 8.1, b* 77.3 at 1/3 SD. Three core technologies differentiate this grade: ① Controlled β-phase crystallization that prevents high-temperature phase transformation; ② Mg/Al layered double hydroxide (LDH) surface coating that improves polymer interfacial compatibility and inhibits acid-gas corrosion; ③ Zero detectable heavy metals (Pb, Cd, Cr, Ni all below detection limits).

Key test results:

• Heat resistance: ΔE < 1.0 at 320°C / 10 min (PP injection molding); no decomposition at 300°C continuous for 30 min.
• Weatherfastness: Grade 4–5 after 1,500h xenon arc (ISO 11341), ΔE < 2.2; equivalent to grade 5 in polyester powder coating systems.
• Bleed resistance: Grade 5 in HDPE at 80°C / 7 days (migration test).
• Halogen content: Molecular chlorine is structurally bound (non-extractable), total chlorine below 0.3%, compliant with IEC 61249-2-21 low-halogen requirements.

Performance advantages versus conventional diarylide yellows and lead chromate:

Powder coating performance: In outdoor polyester/TGIC systems, HONOR PY151-HP maintains gloss retention > 85% after 1,000h QUV-A exposure. It is increasingly specified as a cost-effective replacement for bismuth vanadate yellow in agricultural machinery powder coatings — at approximately 65% of the bismuth vanadate price point.

🌍 Search trend data: “chromate-free yellow pigment” ~3,800/month; “high heat plastic yellow” ~1,200/month. Key markets: Europe, China, India, United States.

Target Industries

• Engineering Plastics (PA, PBT, PC/ABS)
• Outdoor Powder Coatings (Architectural & Transportation)
• High-Performance Inks (Indirect Food Contact)
• Electronic Component Marking (Halogen-Free Required)