Ink for inkjet printer, and temperature indicator using ink

The inkjet printer ink, using a solvent mixture of volatile and less volatile solvents, addresses color intensity and stability issues for refrigerated or frozen products, enabling stable temperature indicators.

JP2025129461APending Publication Date: 2025-09-05HITACHI IND EQUIP SYST CO LTD
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Patent Information

Application Number
JP2024026097
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-02-26
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

Existing temperature-sensing inks for inkjet printers face challenges in ensuring sufficient color intensity and stability when marking refrigerated or frozen products, often requiring operation at non-standard temperatures, which increases equipment and maintenance costs.

Method used

A temperature indicator ink for inkjet printers that dissolves a leuco dye, developer, and decolorizer in a solvent mixture of a highly volatile main solvent and a less volatile auxiliary solvent, with specific ratios and additives to ensure marker drying and color development at controlled temperatures.

Benefits of technology

Enables marking in room temperature environments and on refrigerated or frozen products without premature color development, ensuring stable and readable temperature indicators.

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Abstract

To provide ink for inkjet printer which is capable of marking under a normal temperature environment by using an inkjet printer, and applicable to marking on refrigerated products or frozen products, and a temperature indicator using the ink.SOLUTION: Ink for inkjet printer according to the present invention is ink in which temperature indicator is dissolved into solvent, where the temperature indicator contains leuco dye, developer and decoloring agent, the decoloring agent is a mixture of a plurality of kinds of cholesterol derivative, each of the plurality of kinds of cholesterol derivative has predetermined polar group, polar site and / or polar structure by 1 or more and 3 or less, and the solvent is a mixture of main solvent having relatively high volatility and sub solvent having relatively low volatility.SELECTED DRAWING: Figure 2
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