Reversible thermochromic display article
US7335624B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2005 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Apr 16, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/284
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A reversible thermochromic display article which comprises a substrate and, formed thereon, a heat coloration image containing a heat coloration type reversible thermochromic composition which is colored by heating and is decolored by cooling and a heat decoloration image containing a heat decoloration type reversible thermochromic composition which is decolored by heating and is colored by cooling, or having a multilayer structure comprising a heat coloration layer containing the heat coloration type reversible thermochromic composition and a heat decoloration layer containing the heat decoloration type reversible thermochromic composition, wherein the heat coloration type reversible thermochromic composition is a microcapsule composition which contains, enclosed therein, (a) an electron-donating chromatic organic compound, (b)′ an electron-accepting compound selected from gallic acid esters, and (c) a reaction medium having a melting point lower than 50° C. which is selected from alcohols, esters, ketones, and hydrocarbons and which causes color reactions between the two components to occur reversibly at specific temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.