Process for producing pigment-coated phosphors
US4206250A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 26, 1978 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Oct 26, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A pigment-coated phosphor having good finish sieve passability and capable of forming a fluorescent film with excellent properties can be produced from a process characterized by: PA0 (1) the first step of adding to a water suspension of a phosphor and a pigment an anionic polymer emulsion which has a minimum film forming temperature of less than 30.degree. C.; PA0 (2) the second step of adding a cationic polymer emulsion which has a minimum film forming temperature of 30.degree. C. or lower; PA0 (3) the thrid step of adding an anionic polymer emulsion which has a minimum film forming temperature of 30.degree. C. or higher; and PA0 (4) the fourth step of making the mixture system neutral or weakly acidic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.