Ink Accommodating Body Surface Area Ratio and Dye Stability
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Solution Overview
Problem
Ink jet recording methods using achromatic images formed with black ink alone often suffer from graininess, especially when the achromatic color is light, and existing dyes that improve granularity and ozone fastness have inferior storage stability, with the chemical structure of the dye being a suspected cause but the mechanism not fully elucidated.
Innovation Solution
An ink accommodating body containing an ink composition with a first dye represented by Formula (B-1) or its salt, along with a second or third dye, where the first dye is 0.5% by mass or more of the total composition, and the ink accommodating body has a surface area to volume ratio (A/V) of 1.7 or less, enhancing ozone fastness and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specific dyes are used to improve granularity and ozone fastness, then image quality is improved, but storage stability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the dye molecules by specifying particular structural features (Formula B-1 with R1-R6 definitions, Formula M-1 and M-2 structures) to achieve both improved ozone fastness and storage stability simultaneously, rather than simply adjusting concentration parameters
2Strength
If metal components are present in the ink accommodating body, then structural strength is improved, but dye deterioration is accelerated
Solution Approach 1:
The patent introduces an intermediary protective layer (resin coating or lining material) between the metal components and the ink composition, which prevents direct contact between metal ions and dye molecules, thereby eliminating the catalytic effect that accelerates dye deterioration while maintaining the structural strength of metal components
Solution Approach 2:
The patent employs a disposable protective barrier layer that can be easily applied to metal surfaces, providing temporary protection during ink storage and preventing metal-dye interactions without requiring complex modifications to the metal structure itself
Data Source
AI summary
An ink accommodating body accommodating an ink composition is provided, in which the ink composition contains water and a first dye that is a compound represented by Formula (B-1) or a salt thereof, a content of the first dye in the ink composition is 0.5% by mass or more with respect to a total amount of the ink composition, and a value of a ratio (A/V) is 1.7 or less where a total surface area of a metal, of the ink accommodating body, in contact with the ink composition is A (cm2) and an accommodation capacity for the ink composition accommodated in the ink accommodating body is V (cm3).