Thermosensitive Recording Medium Sulfonamide Developer
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Solution Overview
Problem
Thermosensitive recording materials face issues with discoloration due to oils and plasticizers, insufficient water blocking properties, and reduced recording sensitivity, especially when stored for long periods or exposed to high temperatures, leading to background fogging and yellowing.
Innovation Solution
A thermosensitive recording material with a thermosensitive recording layer containing a sulfonamide compound and a protective layer with diacetone-modified or acetoacetyl-modified polyvinyl alcohol, along with a water resistance-imparting agent, such as hydrazide compounds, to enhance image preservability and resistance to thermal background fogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diphenyl sulfone-crosslinked compound is used as a developer to avoid decoloration due to oils or plasticizers, then preservability of recorded part is improved, but discoloration in blank paper occurs during long-term storage (background fogging)
Solution Approach 1:
The patent changes the chemical structure parameters of the developer by introducing a phenolic hydroxyl group and a carbonyl group in specific positions, which fundamentally alters the reaction mechanism to prevent both decoloration and background fogging while maintaining recording sensitivity
Solution Approach 2:
The patent combines multiple functional groups (phenolic hydroxyl, carbonyl, and sulfonamide) within the developer molecule to create a composite structure that simultaneously provides protection against oils, plasticizers, and alcohol while preventing background fogging during long-term storage
2Reliability
If a urea urethane compound is used to avoid decoloration due to high concentration alcohol contact, then preservability is improved, but discoloration in blank paper occurs during long-term storage (background fogging)
Solution Approach 1:
The patent modifies the developer structure by incorporating a phenolic hydroxyl group and carbonyl group in specific positional relationships, which changes the chemical reactivity to provide alcohol resistance without causing background fogging during long-term storage
3Reliability
If crosslinking agent amount is increased to enhance water blocking properties, then water blocking properties are improved, but recording sensitivity is lowered and yellowing of blank paper worsens
Solution Approach 1:
The patent changes the chemical structure of the developer to include specific functional groups that provide inherent water resistance without requiring excessive crosslinking agents, thereby maintaining recording sensitivity while achieving water blocking properties
Solution Approach 2:
The patent introduces a phenolic hydroxyl group as an intermediary functional group that mediates between water resistance requirements and recording sensitivity, allowing water blocking without excessive crosslinking that would cause yellowing and sensitivity loss
4Object-generated harmful factors
If a color developer with high melting point is used to reduce background fogging, then background fogging is improved, but recording sensitivity is lowered
Solution Approach 1:
The patent changes the molecular structure parameters of the developer by introducing phenolic hydroxyl and carbonyl groups in specific positions, which reduces melting point while simultaneously providing resistance to background fogging through enhanced chemical stability
Solution Approach 2:
The patent creates a composite molecular structure combining phenolic hydroxyl, carbonyl, and sulfonamide groups that work synergistically to provide both low melting point (for high sensitivity) and high stability (for fogging 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 high recording density, excellent resistance to plasticizers, and improved water blocking properties, reducing discoloration and yellowing, while maintaining image quality and sensitivity over time.
Implementation Method 1
a thermosensitive recording material having a thermosensitive recording layer containing at least a leuco dye and a developer on a support; the thermosensitive recording material containing, as the developer, a sulfonamide compound
Implementation Method 2
a protective layer containing diacetone-modified or acetoacetyl-modified polyvinyl alcohol, along with a water resistance-imparting agent
Implementation Method 3
a protective layer containing diacetone-modified or acetoacetyl-modified polyvinyl alcohol as an adhesive agent
Data Source
AI summary
A primary object of the present invention is to provide a thermosensitive recording material that achieves high recording density and excellent preservability of a recorded part, or to provide a thermosensitive recording material that achieves high recording density, and excellent heat resistant and resistance to thermal background fogging property in a high temperature environment, as well as excellent sticking resistance and resistance to dirt adhesion of head. The present invention is a thermosensitive recording material having a thermosensitive recording layer containing at least a leuco dye and a developer on a support; the thermosensitive recording material containing, as the developer, a sulfonamide compound represented by general formula (1); (a) the thermosensitive recording material further having a protective layer on the thermosensitive recording layer; the protective layer containing at least one type of adhesive agent selected from the group consisting of water soluble adhesive agents and water dispersible adhesive agents; and at least one of the thermosensitive recording layer or the protective layer containing a water resistance-imparting agent; or (b) the thermosensitive recording layer further containing saturated fatty acid amide represented by general formula (2).