Pre-dyes, pre-dye compositions, and methods of developing a color
US5837429A · kind A · utility
51Cited by
612References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Jun 5, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0077
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
One embodiment of the present invention is a method and composition comprising a novel pre-dye molecule that is colorless and stable to ordinary light. The pre-dye molecule is capable of forming a color when exposed to certain wavelengths of electromagnetic radiation. A second embodiment of the present invention is a method of converting a conventional leuco dye to a colored composition by exposing the leuco dye admixed with a radiation transorber to certain wavelengths of electromagnetic radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.