Thermosensitive Recording Medium Under Layer Hollow Filler
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Solution Overview
Problem
Conventional thermosensitive recording media experience reduced sensitivity and preciseness due to calendaring, which crushes hollow particles and compromises heat retention and insulation properties.
Innovation Solution
Incorporating a non-thermally-expandable hollow filler with a hydrocarbon having 3-16 carbon atoms in the under layer of the thermosensitive recording medium, which prevents crushing during calendaring and maintains sensitivity and preciseness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hollow microparticles are used in the under layer to achieve high color developing sensitivity, then sensitivity is improved, but the hollow particles are crushed during calendaring, resulting in reduced sensitivity and preciseness
Solution Approach 1:
The patent changes the physical-chemical parameters of the hollow filler by selecting materials with specific glass transition temperatures (Tg). The under layer uses hollow fillers with Tg of 80°C or higher (such as polycarbonate, polyacrylic resin, or acrylic-methacrylic copolymer) that maintain structural integrity during calendaring, preventing crushing while retaining heat retention properties. This parameter-based selection resolves the contradiction between achieving high sensitivity through hollow particles and maintaining reliability after calendaring processing.
2Shape
If calendaring is performed to improve surface smoothness, then surface quality is improved, but hollow particles are crushed compromising heat retention and insulation properties
Solution Approach 1:
The patent applies parameter changes by selecting hollow filler materials with specific glass transition temperatures (Tg ≥ 80°C) that provide sufficient thermal stability during calendaring. The use of high-Tg materials like polycarbonate, polyacrylic resin, or acrylic-methacrylic copolymer ensures the hollow particles maintain their structure under calendaring pressure and temperature, preventing crushing while preserving heat retention and insulation properties. This resolves the contradiction between achieving smooth surface quality through calendaring and maintaining energy efficiency through heat retention.
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 effectively prevents sensitivity reduction and maintains high color developing sensitivity and preciseness by using a hydrocarbon to prevent crushing of hollow fillers during calendaring, ensuring improved heat retention and insulation.
Implementation Method 1
The under layer contains a non-thermally-expandable hollow filler. The thermosensitive recording medium includes a hydrocarbon. An amount of the hydrocarbon having from 3 through 16 carbon atoms is 0.2 mg/m2 or more relative to an area of the thermosensitive recording medium.
Data Source
AI summary
A thermosensitive recording medium includes a base material; a thermosensitive recording layer; and an under layer disposed between the base material and the thermosensitive recording layer and containing a non-thermally-expandable hollow filler. The thermosensitive recording medium includes a hydrocarbon, where an amount of the hydrocarbon having from 3 through 16 carbon atoms is 0.2 mg/m2 or more, relative to an area of the thermosensitive recording medium.