Thermochromic composition
US4743398A · kind A · utility
13Cited by
14References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1986 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Apr 22, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S252/962
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A temperature indicating composition is provided for use on recoverable articles so that heating to produce recovery or to activate a heat-activatable sealant can be monitored. The composition comprises a thermochromic colorant in a binder and an activator that causes the thermochromic colorant to change color at a temperature lower than the temperature at which the colorant would change temperature in the absence of the activator. The thermochromic colorant can be folic acid and the activator can be an acid that has a pK of less than 4.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.