Ink Jet Reaction Liquid Composition for Stable Intermittent Ejection
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Solution Overview
Problem
Existing ink jet recording methods using a reaction liquid with a polyvalent metal salt experience reduced intermittent ejection stability when the ejection is temporarily suspended, leading to smudging and image defects.
Innovation Solution
A reaction liquid for ink jet recording comprising a polyvalent metal salt and a surfactant with a hydrophilic moiety having an anionic group and a hydrophobic aliphatic hydrocarbon group, with a mass ratio of the polyvalent metal salt to surfactant between 10.0 and 35.0 times, is used to stabilize micelle formation and improve ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reaction liquid containing a polyvalent metal salt is used for ink jet recording, then high-quality image recording is achieved, but intermittent ejection stability is reduced when ejection is temporarily suspended
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the polyvalent metal salt and water. The surfactant forms micelles that encapsulate the polyvalent metal salt, preventing its direct interaction with water while maintaining its reactivity with the ink. This mediator role allows the reaction liquid to maintain both high image quality through polyvalent metal salt reactivity and stable ejection properties by preventing harmful direct water-metal interactions
Solution Approach 2:
The patent changes the physical-chemical parameters of the reaction liquid by controlling the mass ratio of polyvalent metal salt to surfactant within 10.0 to 35.0 times. This parameter optimization ensures that the surfactant is present in sufficient amounts to form stable micelles and maintain ejection stability, while not so much as to dilute the reactive polyvalent metal salt content below the threshold for high-quality image recording
2Productivity
If the ejection of reaction liquid is temporarily suspended and then resumed, then recording continuity is maintained, but surfactant precipitation occurs and ejection property deteriorates
Solution Approach 1:
The surfactant is preliminarily mixed with the polyvalent metal salt to form stable micelles before ejection suspension occurs. This preliminary formation of micellar structures ensures that when ejection is resumed after suspension, the surfactant remains in solution form rather than precipitating, thereby maintaining ejection properties and recording continuity without deterioration
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 enhances intermittent ejection stability, preventing surfactant precipitation and ensuring high-quality image recording by maintaining stable micelle formation and reducing surface tension.
Implementation Method 1
stabilize micelle formation
Implementation Method 2
reducing surface tension
Implementation Method 3
a reactant that reacts with the aqueous ink
Data Source
AI summary
Provided is a reaction liquid for ink jet, which can record a high-quality image and is excellent in intermittent ejection stability, to be used together with an aqueous ink. The reaction liquid for ink jet is used in an ink jet recording method including recording an image on a recording medium with an aqueous ink and an aqueous reaction liquid containing a reactant that reacts with the aqueous ink. The reaction liquid includes a polyvalent metal salt and a surfactant. The surfactant is a compound including a hydrophilic moiety having an anionic group and a hydrophobic moiety that is an aliphatic hydrocarbon group. A mass ratio of a content (% by mass) of the polyvalent metal salt in the reaction liquid to a content (% by mass) of the surfactant therein is 10.0 times or more to 35.0 times or less.