Pressure-sensitive record color-developing sheet
US4421344A · kind A · utility
6Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1982 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Jul 9, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/256
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A pressure-sensitive record color-developing sheet capable of developing thereon clear color images having an excellent light fastness, comprises a substrate layer and a color-developing layer containing an acid color-developing agent, for example, activated clay or aluminum silicate, a binder and a color development-promoting, color fading-preventing agent consisting of a thiourea compound and a zinc compound selected from zinc oxide, zinc hydroxide, and mixtures thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.