Thermochromic materials
US5281570A · kind A · utility
24Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1992 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Jul 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2984
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A reversible thermochromic material, preferably in the form of a microcapsule, comprising: PA0 (a) an electron donative color former; PA0 (b) a sulfide, sulfoxide or sulfone containing a hydroxy phenyl radical; and PA0 (c) a chemical compound selected from alcohols, esters, ethers, ketones, carboxylic acids or acid amides, chromatizes very brightly and in a dense color, generates a change of chromic hue (colored - colorless) within a narrow temperature range and provides a stable thermochromatism on a long term basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.