Core-Shell Polymer Ink for Ejection Stability
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Solution Overview
Problem
Ink jet ink compositions face challenges with ejection stability and adhesiveness due to the polymer particles' glass transition temperature, which affects their adherence to recording media and the recording head, leading to poor performance in high-definition image recording.
Innovation Solution
The ink jet ink composition incorporates polymer particles with a core-shell structure, where the glass transition temperature of the core and shell polymers are specifically tailored to satisfy certain temperature relationships, ensuring improved ejection stability and adhesiveness by preventing polymer deposition in the recording head and enhancing film formation on the recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the glass transition temperature of the polymer is improved (raised), then ejection stability is improved by preventing adherence in the recording head, but adhesiveness to the recording medium becomes poor
Solution Approach 1:
The polymer particle is divided into a core region and a shell region with different glass transition temperatures. The core has a lower Tg to ensure adhesiveness and film formation, while the shell has a higher Tg to prevent adherence in the recording head, thus resolving the contradiction between ejection stability and adhesiveness.
Solution Approach 2:
Different regions of the polymer particle are assigned different thermal properties. The core polymer has a lower glass transition temperature for softening and adhesion during drying, while the shell polymer has a higher glass transition temperature to maintain stability during ejection, creating local quality differentiation to solve the contradiction.
2Use of energy by moving object
If the glass transition temperature of the polymer is lowered, then adhesiveness to the recording medium is improved, but ejection stability becomes poor due to polymer adherence in the warmed recording head
Solution Approach 1:
The polymer particle is segmented into core and shell regions with different Tg values. The core has lower Tg for good adhesiveness, while the shell has higher Tg to prevent head adherence, thus maintaining both ejection stability and adhesiveness simultaneously.
Solution Approach 2:
The polymer particle is constructed as a composite structure with core polymer and shell polymer having different glass transition temperatures. This composite structure allows the particle to exhibit both low-Tg characteristics (adhesiveness) and high-Tg characteristics (ejection stability) that cannot be achieved with a single polymer material.
3Device complexity
If a single polymer is used in the ink composition, then the formulation is simple, but it cannot simultaneously achieve good ejection stability and adhesiveness due to conflicting temperature requirements
Solution Approach 1:
The ink composition uses composite polymer particles with core-shell structure, where core polymer and shell polymer have different glass transition temperatures. This composite approach enables simultaneous achievement of ejection stability and adhesiveness, overcoming the limitations of single-polymer formulations.
Solution Approach 2:
Instead of using a single polymer, the formulation segments the polymer function into core and shell components with different thermal properties. This segmentation allows each component to optimize for its specific function, achieving both ejection stability and adhesiveness that a single polymer cannot provide.
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 results in excellent ejection stability and adhesiveness, allowing for high-speed printing with improved friction resistance and drying properties while preventing thermal deformation of the recording medium.
Implementation Method 1
the polymer particle has a core polymer containing a polymer of glass transition temperature A (unit: ° C.) and a shell polymer containing a polymer of glass transition temperature B (unit: ° C.)
Implementation Method 2
drying the recording medium, on which the ink jet ink composition is adhered, at drying temperature D (unit: ° C.)
Data Source
AI summary
There is provided an ink jet ink composition, which is used in a recording method including ejecting the ink jet ink composition from a recording head of head temperature C (unit: ° C.) onto a recording medium to adhere the ink jet ink composition thereonto and drying the recording medium, on which the ink jet ink composition is adhered, at drying temperature D (unit: ° C.), including water; and a polymer particle, in which the polymer particle has a core polymer containing a polymer of glass transition temperature A (unit: ° C.) and a shell polymer containing a polymer of glass transition temperature B (unit: ° C.) and formed on the surface of the core polymer, and in which the A, B, C, and D satisfy predetermined relations.