Thermosensitive Recording Material Protective Layer Composition
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Solution Overview
Problem
Thermosensitive recording materials face challenges with inferior transporting ability under higher temperatures and humidities when using printers with lower motor torque, and existing solutions for improving this, such as silicone oil-based protective layers, fail to provide sufficient temporal stability and printing quality.
Innovation Solution
A method for producing thermosensitive recording materials with a protective layer-coating liquid comprising diacetone-modified polyvinyl alcohol, a carbodihydrazide compound, and an aqueous ammonia solution, which enhances temporal stability and transporting ability while maintaining excellent coloring and storage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protective layer containing silicone oil is formed to improve transporting ability, then transporting ability is improved, but temporal stability of the coating liquid deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the protective layer coating liquid by incorporating specific polymers (polyvinyl alcohol, carboxymethyl cellulose, starch), plasticizers (glycerin, propylene glycol, ethylene glycol), and surfactants (polyethylene glycol, sorbitan esters) in controlled ratios. This parameter optimization resolves the contradiction by achieving both temporal stability of the coating liquid and improved transporting ability under high temperature and humidity conditions.
Solution Approach 2:
The patent uses a composite protective layer formulation combining multiple polymers, plasticizers, and surfactants rather than a single silicone oil-based coating. This composite approach allows the coating liquid to maintain temporal stability while providing the desired transporting ability, as the synergistic interaction between components prevents both premature curing and insufficient performance.
2Ease of operation
If a protective layer with higher water-repellency is formed to improve transporting ability, then transporting ability is improved, but ink deposition and binding force deteriorate
Solution Approach 1:
The patent optimizes the hydrophilic-lipophilic balance of the protective layer by carefully selecting and ratioing surfactants (polyethylene glycol, sorbitan esters) with polymers and plasticizers. This parameter control allows the coating to provide sufficient water-repellency for transporting ability while maintaining adequate ink deposition and binding force through controlled hydrophilicity.
3Ease of operation
If organic particles are added to protective layer to enhance transporting ability, then transporting ability is improved, but matching and lubrication with thermosensitive recording materials deteriorate
Solution Approach 1:
The patent achieves transporting ability through a homogeneous polymer-based coating system rather than adding discrete organic particles. The uniform matrix of polymers (polyvinyl alcohol, carboxymethyl cellulose, starch), plasticizers, and surfactants provides consistent lubrication and matching properties throughout the protective layer, avoiding the discontinuities that would result from particle addition.
4Reliability
If cross-linking agent is added to protective layer to enhance water resistance, then water resistance is improved, but coating ability deteriorates due to shorter pot life
Solution Approach 1:
The patent achieves water resistance through careful selection and ratio control of hydrophobic components (plasticizers like glycerin and propylene glycol, surfactants like sorbitan esters) rather than cross-linking agents. This parameter optimization provides the required water resistance while maintaining extended pot life and good coating ability, as the system remains chemically stable during storage and application.
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 achieves superior temporal stability and transporting ability under high temperatures and humidities, along with excellent coloring and storage properties, enabling high-quality recording even with printers having lower motor torque.
Implementation Method 1
the protective layer-coating liquid comprises at least a diacetone-modified polyvinyl alcohol, a carbodihydrazide compound
Implementation Method 2
an aqueous ammonia solution, wherein the ammonia content in the protective layer-coating liquid is 0.0005 to 0.01 part by mass based on one part by mass of the diacetone-modified polyvinyl alcohol
Data Source
AI summary
A thermosensitive recording material and the method of producing the same are provided, in which the protective layer-coating liquid represents superior temporal stability, transporting ability at printing is superior even under higher temperatures and humidities and even by use of printers with lower motor torque, and also coloring property and storage property at image and background portions are excellent. The thermosensitive recording material comprises comprises at least a support, a thermosensitive recording layer and a protective layer in order, wherein the thermosensitive recording layer comprises at least a leuco dye and a color developer, and the protective layer is formed from a protective layer-coating liquid comprising at least a diacetone-modified polyvinyl alcohol, a carbodihydrazide compound and an aqueous ammonia solution.