Halogenated Zinc Phthalocyanine Coloring Composition Viscosity Stability

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Solution Overview

Problem

Coloring compositions with high concentrations of halogenated zinc phthalocyanine pigments face challenges in viscosity stability, making it difficult to form thin films and patterns in color filters, leading to issues like crosstalk and acicular crystal formation during the manufacturing of color filters and solid-state imaging devices.

Innovation Solution

Incorporating a trace amount of Group 2 element ions, specifically calcium ions, into the coloring composition to improve the dispersibility and viscosity stability of halogenated zinc phthalocyanine pigments, while maintaining a high concentration of colorants, which helps in forming stable cured films and reducing crosstalk and acicular crystal formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the concentration of halogenated zinc phthalocyanine pigments is increased to form thin films and reduce crosstalk, then the color filter quality is improved, but the viscosity stability of the coloring composition deteriorates

Engineering Contradiction:

Improvecolor filter qualityVSAvoidviscosity stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

Group 2 element ions (calcium, magnesium, or strontium) are introduced as intermediary substances to mediate between the halogenated zinc phthalocyanine pigment particles and the resin matrix. These ions improve the dispersibility of pigment particles in the coloring composition, enabling high pigment concentration (50% or more of total solid content) to be achieved while maintaining stable viscosity characteristics and preventing acicular crystal formation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the concentration of colorants is increased to form thin films, then crosstalk is reduced, but the amount of lithographic components is relatively decreased, making pattern formation difficult

Engineering Contradiction:

ImprovecrosstalkVSAvoidpattern formation

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The addition of Group 2 element ions fundamentally changes the rheological parameters of the coloring composition by improving pigment dispersibility. This allows the composition to maintain both high colorant concentration (for reduced crosstalk) and appropriate viscosity characteristics (for successful photolithography patterning), effectively decoupling these two previously conflicting requirements.

Inventive Principle:

Principle #35Parameter changes

3Length of stationary object

If high concentration of colorants is used, then thin film formation is enabled, but acicular crystal formation occurs during manufacturing

Engineering Contradiction:

Improvefilm thicknessVSAvoidacicular crystal formation

Core Design Contradiction:

Length of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The Group 2 element ions convert the potentially harmful high concentration of pigment particles into a beneficial state by improving their dispersibility and compatibility with the resin. This prevents the aggregation and acicular crystal formation that would normally occur at high pigment concentrations, while still enabling thin film formation with excellent color purity and reduced crosstalk.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides a coloring composition with excellent viscosity stability, enabling the formation of high-quality color filters and solid-state imaging devices with reduced crosstalk and acicular crystals, improving the manufacturing process and device performance.

Implementation Method 1

by incorporating a trace amount of Group 2 element ions into the coloring composition, it is possible to improve the dispersibility of the halogenated zinc phthalocyanine pigment by keeping a good equilibrium between a resin and a pigment derivative

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 2

a coloring composition including a halogenated zinc phthalocyanine pigment and having a high concentration of colorants in the total solid content has a big change in viscosity over time and its viscosity stability is easily lowered

Methodology Applied

Scientific EffectViscosity stabilization:

Data Source

PatentUS9650493B2Coloring composition, cured film, color filter, pattern forming method, method for manufacturing color filter, solid-state imaging device, and image display device

Publication Date: 2017.05.16 FUJIFILM CORP

AI summary

A coloring composition containing a halogenated zinc phthalocyanine pigment, which has excellent viscosity stability, is provided. A cured film, a color filter, a pattern forming method, a method for manufacturing a color filter, a solid-state imaging device, and an image display device, each using the coloring composition, are also provided.The colorant composition includes a colorant, a resin, and a pigment derivative, in which the colorant contains a halogenated zinc phthalocyanine pigment, the content of the colorant with respect to the total solid content in the coloring composition is 50% by mass or more, and the content of the Group 2 element ions with respect to the mass of the halogenated zinc phthalocyanine pigment is 30 ppm by mass to 300 ppm by mass.