Process for the preparation of fluorescent compositions, fluorescent compositions and their use
US6274065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1998 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Feb 3, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/917
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Preparation of a solid fluorescent composition comprising PA1 (1) mixing a host chromophore and an effective amount of a pigment precursor in a solvent, then generating a pigment as guest chromophore in-situ from the pigment precursor, and, subsequently, isolating the mixture of the host and guest chromophores, thereby forming a solid solution, or PA1 (2) mixing a polymer as a matrix or a polymer precursor and a pigment precursor in a solvent, if desired in the presence of a chromophore being a host component, then generating a pigment in-situ from the pigment precursor (being the guest component if a host component is present), and, subsequently, isolating the mixture of polymer and pigment, and--if present--the host component, thereby forming a solid solution, wherein in all cases where there is a host component, the absorption spectrum of the pigment (guest chromophore) overlaps with the fluorescence emission spectrum of the host chromophore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.