Ink Set for Inkjet Recording with Polymerizable Base Layer
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Solution Overview
Problem
Existing inkjet recording methods using cholesteric liquid crystals often result in poor color development due to ink absorption into the substrate, which disrupts the substrate's texture and uniformity of helical axis directions, leading to reduced light reflection intensity.
Innovation Solution
An ink set comprising a base ink with polymerizable compounds and an image recording ink containing a polymerizable liquid crystal compound and a chiral compound, applied using inkjet recording methods to form a base layer and image, respectively, ensuring uniform helical axis direction and maintaining substrate texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the substrate is fully coated with a solution for forming a base layer by using a bar coater, then the base layer is formed, but the texture of the substrate is not maintained
Solution Approach 1:
The invention divides the coating process into two separate stages: first applying a base layer-forming solution to create a uniform base layer, then applying a texture layer containing cholesteric liquid crystals to restore and enhance the substrate texture. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The base layer is formed in advance before applying the texture layer. This preliminary action ensures that the base layer provides a stable foundation for subsequent texture application, allowing the texture layer to be applied uniformly without being affected by substrate irregularities.
2Strength
If the ink is absorbed into the substrate, then the substrate provides structural support, but the tone unique to the cholesteric liquid crystals is not obtained
Solution Approach 1:
The invention introduces a base layer as an intermediary between the substrate and the cholesteric liquid crystal layer. This base layer prevents direct ink absorption into the substrate while maintaining structural support, thereby preserving the light reflection properties of the cholesteric liquid crystals.
Solution Approach 2:
The invention applies different properties to different layers: the base layer provides uniformity and prevents absorption, while the texture layer containing cholesteric liquid crystals provides the unique optical properties. Each layer is optimized for its specific function.
3Reliability
If a base layer is formed on a substrate, then the ink absorption is prevented, but the texture of the substrate is not maintained
Solution Approach 1:
The coating system is segmented into two distinct layers: a base layer for preventing ink absorption and a texture layer for maintaining substrate texture. This segmentation allows each layer to specialize in its primary function without compromising the other.
Solution Approach 2:
The invention uses a composite structure consisting of a base layer and a texture layer with different compositions and functions. The base layer provides absorption prevention while the texture layer provides textural properties, creating a composite system that achieves both goals simultaneously.
4Strength
If appropriate methods are used to treat the entire support before coating or printing, then the adhesion is improved, but the texture of the support is not maintained
Solution Approach 1:
Instead of uniformly treating the entire support surface, the invention applies different treatments to different layers: the base layer receives treatment for adhesion and absorption prevention, while the texture layer is applied to preserve and enhance the local texture properties of the support.
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
This approach enables excellent color development and texture preservation across various substrates by forming a flexible base layer and uniform cholesteric liquid crystal structures, enhancing light reflection intensity and image quality.
Implementation Method 1
an image recording ink comprising a polymerizable liquid crystal compound and a chiral compound
Implementation Method 2
cholesteric liquid crystals have unique light reflectivity which enables the liquid crystals to change tone depending on the viewing angle
Implementation Method 3
a base ink comprising at least one polymerizable compound selected from the group consisting of a monofunctional polymerizable compound and a difunctional polymerizable compound
Data Source
AI summary
An ink set for inkjet recording includes a base ink which contains at least one polymerizable compound selected from the group consisting of a monofunctional polymerizable compound and a difunctional polymerizable compound and an image recording ink which contains a polymerizable liquid crystal compound and a chiral compound. An image recording method uses the ink set.