Diazotype reproduction layer formed from matrix of spheric particle polystyrene pigment and diazotype components
US3996056A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Feb 5, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/95
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Plastic pigment spheric particles which form a matrix for diazotype reproduction materials are applied to a base sheet. Whether the diazo sensitizing solution is included in admixture with spheric plastic pigment particles or is applied thereafter as a second coating, a matrix is formed having a sensitized diazo layer dispersed throughout. Such diazo matrices permit control of contrast ratios over a wide range. Also such diazo matrices are transferable. The diazo matrix image can be made water fast by an after treatment by means of a solvent. Such a matrix lends itself to the heat development process by retaining the heat generated development agents within the matrix due to its thermoplastic character. In another aspect of the invention multi-color diazo reproduction on a single base sheet employing consecutive overcoatings of the matrix and diazo sensitizing solution after each development can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.