Phosphorescent materials
US5100580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An organic phosphor which is a solid insoluble in water and organic solvents and which may be used in a phosphorescent printing ink or a paper coating composition comprises molecules of at least one phosphorescent activator held within a matrix of a condensation resin that does not itself absorb ultraviolet or visible radiation at the excitation and emission frequencies of the phosphorescence activator(s). The phosphorescence activator(s) is/are a compound or mixtures of compounds of the general formula EQU (A).sub.m --Ar--CO--X (I) wherein Ar denotes a fused ring polycyclic aromatic group; PA1 m is zero or an integer of from 1 up to the maximum number of ring positions available for substitution; PA1 X denotes an alkyl group or a group of the formula (A).sub.m --Ar-- or (B).sub.n Ph--wherein Ph is a phenyl group and n is zero or an integer of from 1 to 5; and PA1 A and B represent ring substituents, or an acid addition salt thereof when said compound is basic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.