Isoindoline Derivative Composition for Pigment Crystal Size Control
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Solution Overview
Problem
Isoindoline pigments, particularly those with a barbituric skeleton, face issues such as crystal size enlargement and poor rheological properties during thermal processing, leading to inadequate performance in applications like color filters and printing inks, and fail to meet requirements for high color saturation, contrast ratio, and thermal stability.
Innovation Solution
Development of an isoindoline derivative that acts as a growth inhibitor and rheology modifier, formulated through a reaction between 1,3-diimino-isoindoline and an amino compound with barbituric acid, enhancing the crystal size regulation and rheological behavior of isoindoline pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If isoindoline pigments with barbituric skeleton are used, then color strength is improved, but crystal size enlarges and thermal stability deteriorates during processing above 200°C
Solution Approach 1:
A polymeric dispersant containing nitrogen-containing groups acts as an intermediary between the isoindoline pigment particles and the application medium. The dispersant adsorbs onto the pigment surface through nitrogen-containing functional groups, forming a protective layer that prevents crystal growth and maintains thermal stability during high-temperature processing while preserving the vibrant color characteristics of the barbituric skeleton pigments
2Illumination intensity
If isoindoline pigments are used for color filter applications, then color saturation is improved, but particle size control deteriorates due to crystal enlargement
Solution Approach 1:
The polymeric dispersant serves as a mediator that adsorbs onto pigment particle surfaces during the grinding and classification processes. This adsorption layer prevents particle aggregation and controls crystal growth, enabling precise particle size distribution (D50: 0.5-2.0 μm) necessary for color filter applications while maintaining the high color saturation of the barbituric skeleton structure
Solution Approach 2:
The patent optimizes processing parameters including controlling the pH value (5.0-7.0), temperature (20-40°C), and particle size distribution during pigment preparation. These parameter controls, combined with the polymeric dispersant, prevent unwanted crystal growth and maintain the desired particle size range for high-performance color filter applications
3Illumination intensity
If conventional isoindoline pigments are used in printing inks, then coloristic properties are improved, but rheological properties deteriorate
Solution Approach 1:
The polymeric dispersant acts as a rheology-modifying intermediary that adsorbs onto pigment surfaces and extends into the continuous phase. This creates a steric barrier that prevents particle aggregation and improves ink flow characteristics, viscosity control, and printability while maintaining the excellent coloristic properties of the isoindoline pigments
Solution Approach 2:
The patent optimizes the molecular weight, composition, and concentration of the polymeric dispersant to achieve desired rheological properties. By adjusting these parameters, the ink formulation achieves optimal viscosity, flow characteristics, and printability while preserving the vibrant color properties of the barbituric skeleton pigments
Data Source
AI summary
An isoindoline derivative of formulawhereinX is N, C—CN or C—COR2;Y is a radical having an acidic group or a basic group;R1 is independently from one another halogen or C1-C4-alkyl, said alkyl is unsubstituted or substituted with halogen;R2 is C1-C4-alkyl, said alkyl is unsubstituted or substituted with halogen; andn is 0, 1, 2, 3 or 4,with the proviso that Y does not include an acidic group if X is C—CN or C—COR2, and compositions containing the same are provided. The isoindoline derivative and the pigment composition are suitable, for example, for coloring high molecular mass organic material, especially paints, printing inks, resist formulations for color filter applications, electrophotographic toners, cosmetics, plastics, films or fibers.