Thermosensitive Recording Layer Composition for Wet-Resistant Images
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Solution Overview
Problem
Thermosensitive recording media lack sufficient hot water resistance, water resistance, ethanol resistance, temperature-humidity resistance, and wet abrasion resistance, leading to image discoloration or fading when exposed to high temperatures or moisture.
Innovation Solution
A thermosensitive recording medium comprising a support and a thermosensitive recording layer containing a compound represented by General Formula (1) and a styrene-acryl resin, which includes a non-phenolic color developer, enhancing the medium's resistance to hot water, water, ethanol, temperature-humidity, and wet abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermosensitive recording layers are used, then image formation is achieved, but hot water resistance and image stability deteriorate
Solution Approach 1:
The patent employs a composite binder system comprising polyvinyl alcohol and polyamide epichlorohydrin resin in specific proportions (polyvinyl alcohol: 1-10 parts by mass, polyamide epichlorohydrin resin: 0.1-5 parts by mass per 100 parts by mass of color developer). This composite material combination provides both hot water resistance and image stability, resolving the contradiction between these two properties.
2Reliability
If polyvinyl alcohol and polyamide epichlorohydrin resin are added to improve water resistance, then hot water resistance improves, but binder complexity and manufacturing complexity increase
Solution Approach 1:
The patent optimizes the mass ratios of binder components to specific ranges (polyvinyl alcohol: 1-10 parts, polyamide epichlorohydrin resin: 0.1-5 parts per 100 parts of color developer) to achieve effective water resistance while controlling formulation complexity. This parameter optimization allows the complex composite binder to function effectively without requiring excessive component variations.
3Reliability
If hydrophobic resin emulsion is used as binder to improve water resistance, then water resistance improves, but image concentration and quality deteriorate
Solution Approach 1:
The patent uses polyvinyl alcohol, which is water-soluble and provides homogeneous distribution of color developer particles, avoiding the aggregation issues caused by hydrophobic resins. This homogeneous binder system maintains high image concentration and quality while achieving water resistance through the combined polyvinyl alcohol-polyamide epichlorohydrin resin system.
4Object-affected harmful factors
If non-phenolic color developer is used to improve environmental compatibility, then environmental friendliness improves, but color development efficiency and image concentration may deteriorate
Solution Approach 1:
The patent optimizes the配比 (proportions) of color developer to leuco dye and binder components to ensure that non-phenolic color developers achieve sufficient image concentration. The specific binder composition (polyvinyl alcohol with polyamide epichlorohydrin resin) enhances color developer efficiency, allowing environmental-friendly formulations to maintain high image quality.
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 medium achieves high-concentration image formation with improved resistance to hot water, water, ethanol, temperature-humidity, and wet abrasion, while being environmentally friendly by avoiding phenolic compounds.
Implementation Method 1
a thermosensitive recording layer which includes a compound represented by General Formula (1)
Implementation Method 2
which includes a non-phenolic color developer and optionally a leuco dye and photothermal conversion material
Data Source
AI summary
Provided is a thermosensitive recording medium including a support and a thermosensitive recording layer disposed on or above the support. The thermosensitive recording layer include a compound represented by General Formula (1) and a styrene-acryl resin, where, in General Formula (1), R2 is a C1-12 straight-chain, branched-chain, or alicyclic alkyl group, C7-12 aralkyl group that is substituted with a C1-12 alkyl group, a C1-12 alkoxy group, a C6-12 aryl group or a halogen atom, or a C6-12 aryl group that is unsubstituted or substituted with a C1-12 alkyl group, a C1-12 alkoxy group, a C6-12 aryl group, or a halogen atom, where two or more R2 may be identical to or different from each other; and A1 is a hydrogen atom or a C1-4 alkyl group, where two or more A1, may be identical to or different from each other.