Thermochromic materials
US4028118A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1975 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Dec 23, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24835
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An excellent thermochromic material exhibiting a sharp and reversible metachromatism at temperatures within a range of from -40.degree. to 80.degree. C can be formed from (A) an electron-donating, chromatic organic compound; (B) a compound containing a phenolic hydroxyl group; (C) a compound selected from the group consisting of higher aliphatic monovalent alcohols; and (D) a compound selected from the group consisting of higher aliphatic monovalent acid alcohol esters. The excellent thermochromic characteristics of such a thermochromic material can be further improved when it is occluded in fine microcapsules having a size not exceeding 50 .mu.. Thermochromic polymers, thermochromic printing inks, thermochromic writing instruments, thermochromic paints and thermochromic sheets having excellent thermochromatic characteristics and wide utility can be prepared from such a thermochromic material or microencapsulated thermochromic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.