Organic Phosphorus Coated Paper for Inkjet Deformation Control
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Solution Overview
Problem
The ink jet recording method for image formation on paper media using aqueous ink often results in deformation due to moisture permeation, leading to curling or cockling, and existing solutions like isocyanate compounds pose safety risks and fail to adequately prevent deformation while maintaining image quality.
Innovation Solution
An image recording paper medium coated with a solution containing specific organic phosphorus compounds, such as organic phosphonic or phosphoric acids, and their salts, combined with a calcium carbonate coat layer, effectively prevents moisture permeation and maintains high-resolution image quality with excellent glossiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isocyanate compound is used to prevent deformation, then deformation prevention is improved, but safety deteriorates due to high reactivity and safety problems
Solution Approach 1:
The patent changes the chemical parameter from isocyanate compound to organic phosphorus compound (specifically organic phosphoric acid or organic phosphonic acid and their salts), which have lower reactivity and better safety profiles while maintaining the ability to prevent paper deformation through moisture control
Solution Approach 2:
The patent uses a coating layer containing organic phosphorus compound that can be applied to the paper medium surface, providing effective deformation prevention without the need for hazardous isocyanate compounds, thus achieving safety improvement while maintaining functionality
2Ease of manufacture
If aqueous ink is used for image recording, then running cost is reduced and device complexity is lowered, but deformation occurs due to moisture permeation
Solution Approach 1:
The patent applies a coating layer containing organic phosphorus compound to the paper medium before ink jet recording. This preliminary action creates a moisture barrier that prevents deformation when aqueous ink is applied, enabling the use of simple and cost-effective aqueous ink systems without suffering from deformation problems
3Quantity of substance
If moisture permeates the recording medium, then ink absorption occurs, but deformation results from hydrogen bond cleavage and recombination
Solution Approach 1:
The organic phosphorus compound coating layer acts as an intermediary between the aqueous ink and the paper medium. It controls moisture permeation to allow sufficient ink absorption while preventing excessive moisture penetration that would cause hydrogen bond cleavage and deformation, thus mediating between ink absorption and deformation prevention
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 use of organic phosphorus compounds in the paper medium prevents deformation and maintains high-resolution image quality with enhanced glossiness, addressing the safety concerns associated with isocyanate compounds and improving the ink jet recording process.
Implementation Method 1
the moisture in an aqueous ink permeates the recording medium... by coating beforehand a recording medium with a liquid composition containing a specific isocyanate compound, it is possible to prevent the deformation of the recording medium... a recording medium, which is obtained by coating a paper medium with a solution containing a specific organic phosphorus compound, is effectively prevented from curling
Implementation Method 2
a high-resolution image can be formed on such a recording medium, and a degree of glossiness of the formed image is excellent
Data Source
AI summary
The image recording paper medium contains at least one kind of organic phosphorus compound selected from an organic phosphonic acid represented by the following Formula (1), a salt thereof, an organic phosphoric acid represented by the following Formula (2), and a salt thereof.In the formulae, each of R1 and R2 independently represents an unsubstituted alkyl group, an unsubstituted cycloalkyl group, an unsubstituted alkenyl group, or an aryl group.