Diazotype composition with a non-migrating yellow coupler of controlled coupling energy
US4743524A · kind A · utility
2Cited by
7References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1986 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Oct 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Diazotypes with new yellow coupler with an active methylene group are disclosed; the couplers do not migrate and excel by their relatively reduced coupling speed for greatly improved shelf life of diazotypes. In preferred embodiments the improved new diazotypes contain acetoacetoxyethyl methacrylate or acrylate as yellow coupler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.