Reversible thermosensitive coloring material and reversible thermosensitive recording material using the reversible thermosensitive coloring material
US7419934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2007 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | May 1, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/3375
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A reversible thermosensitive coloring material which can reversibly achieve a relatively colored state and a relatively discolored state depending on a temperature to which the coloring material is heated or a cooling speed at which the coloring material is cooled after heated. The coloring material including an electron donating coloring agent; an electron accepting color developer configured to color the coloring agent; and a compound having a Zwitter ion in which a total of charges in a molecule of the compound is zero. A reversible thermosensitive recording material including a substrate and a reversible thermosensitive recording layer, which is located overlying the substrate and which includes the reversible thermosensitive coloring material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.