Thermosensitive Recording Medium with Hollow-Particle Thermal Insulation
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Solution Overview
Problem
Thermosensitive recording mediums using N-phenylureido-phenyl-benzenesulfonamide as a color developer struggle to achieve dynamic sensitivity and high heat resistance simultaneously, leading to undesirable color development during digital printing processes.
Innovation Solution
A thermosensitive recording medium with a support layer, undercoat layer containing at least 20% hollow particles with a 60% or higher hollow ratio, and a thermosensitive coloring layer comprising a leuco dye and specific types of color developers, including 1,3-diphenylurea as a stabilizer, to enhance dynamic sensitivity and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If N-phenylureido-phenyl-benzenesulfonamide is used as a color developer, then environmental compatibility is improved, but dynamic sensitivity deteriorates
Solution Approach 1:
The patent uses a composite developer system combining N-phenylureido-phenyl-benzenesulfonamide with N-phenylureido-phenyl-oxy-sulfonyl-aryl compounds and N,N'-di-([arylsulfonyloxy]phenyl)urea compounds. This composite approach maintains environmental compatibility by avoiding phenols while achieving dynamic sensitivity levels comparable to traditional bis-phenol developers through synergistic interactions between the different developer components.
2Object-affected harmful factors
If non-phenol developers are used, then health safety is improved, but heat resistance deteriorates
Solution Approach 1:
The patent modifies the chemical structure parameters of the developer compounds by introducing specific substituents (R1-R6 groups) on the aromatic rings of N-phenylureido-phenyl-benzenesulfonamide and related compounds. These structural parameter changes enable the non-phenol developers to achieve heat resistance comparable to traditional phenolic developers while maintaining health safety benefits.
3Reliability
If dynamic sensitivity is improved through combination with sensitizer, then colour development is enhanced, but heat resistance deteriorates
Solution Approach 1:
The N-phenylureido-phenyl-benzenesulfonamide and related compounds serve multiple functions simultaneously: they act as developers providing color development, maintain heat resistance up to 110°C, and eliminate the need for separate sensitizer additives. This multi-functionality resolves the contradiction by achieving enhanced dynamic sensitivity without compromising heat resistance.
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 good dynamic sensitivity, plasticizer resistance, oil resistance, and alcohol resistance, with high heat resistance up to 110°C, suitable for digital printing processes.
Implementation Method 1
the undercoat layer comprises at least one type of plastic hollow particles as organic fillers, the plastic hollow particles comprising at least 20% of hollow particles, by mass with respect to the mass of all the hollow particles, which have a hollow ratio at 60% or more
Implementation Method 2
a dye, such as a leuco dye, in one layer of the medium reacts, upon the application of heat, with another component, a so-called 'developer', in order to give rise to a coloured product
Data Source
Figure 1~2
AI summary
The present invention relates to a thermosensitive recording medium comprising at least: - a support layer, - an undercoat layer over the support layer, - a thermosensitive colouring layer over the undercoat layer, - a protective layer over the thermosensitive colouring layer, wherein - the undercoat layer comprises at least one type of plastic hollow particles as organic fillers, the plastic hollow particles comprising at least 20% of hollow particles, by mass with respect to the mass of all the hollow particles, which have a hollow ratio at 60% or more, the hollow ratio being a percentage ratio of the inner diameter of the hollow particles to the outer diameter of the hollow particles; - the thermosensitive colouring layer comprises at least two types of colour developers from groups with (1) an N-phenylureido-phenyl-benzenesulfonamide structure, (2) an N-phenylureido-phenyl-oxysulfonyl-aryl structure, and/or or (3) an N,N'-di-([arylsulfonyloxyl]-phenyl)urea structure. The present invention relates to the use of such a thermosensitive recording medium in food packaging.