Colorant, colorant composition and method for producing same, colorant dispersion, coating material, coating film, multilayer coating film, and coated article for vehicle exteriors

A colorant with controlled particle size and X-ray diffraction properties, combined with additives, addresses the limitations of conventional blue pigments, achieving high transparency and vividness in coatings, enhancing dark and color flop properties, suitable for automotive applications.

WO2026105638A1PCT designated stage Publication Date: 2026-05-21TOYO INK MFG CO LTD +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TOYO INK MFG CO LTD
Filing Date
2025-11-05
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Conventional blue colorants used in automotive paints fail to achieve high angle dependence of lightness (dark flop property), low angle dependence of hue (color flop property), and high transparency, with existing pigments like C.I. Pigment Blue 15:6 exhibiting insufficient vividness and flip-flop properties.

Method used

A colorant represented by chemical formula (1) with specific particle size, aspect ratio, and X-ray diffraction characteristics, combined with pigment derivatives and resins, to form coatings with enhanced dark flop, low color flop, and vividness, using a method involving dissolution, precipitation, and mechanical grinding.

Benefits of technology

The solution provides blue coatings with high transparency, vivid color tone, and improved flip-flop properties, addressing the limitations of conventional methods, achieving coatings with enhanced dark flop and color flop resistance.

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Abstract

The present disclosure provides a colorant with which it is possible to form a blue coating film that has high angle dependence of brightness (dark flop properties), low angle dependence of hue (color flop properties), high transparency, and a clear color tone. The colorant is represented by chemical formula (1) and satisfies the following requirements 1, 2, and 3. Requirement 1: the average primary particle diameter in a transmission microscope image is 20 nm to 300 nm inclusive. Requirement 2: the average value of (major axis) / (minor axis) ratios of primary particles in a transmission microscope image is 1 to 2.5 inclusive. Requirement 3: in a powder X-ray diffraction spectrum indicated by diffraction intensity with respect to a diffraction angle 2θ as measured by using CuKα line, there is a peak in the 2θ range of 25.55° to 25.95° inclusive.
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