Homogeneous single-part color developer per color film processing and method of using same
US6664036B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2002 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Aug 28, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form and an N,N-dialkyl- or N,N-diarylhydroxylamine antioxidant that has at least one solubilizing substituent. The concentrate also includes a water-miscible or water-soluble organic co-solvent that has a molecular weight of from about 100 to about 400, is present in the concentrate at a concentration such that the weight ratio of water to the organic co-solvent is from about 7:1 to about 30:1, and is represented by the following Structure I:Y—Z−M+  (I)wherein Y is uncharged in the pH range of from 10 to 11 and is an alkyl group having 4 to 16 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms in the ring, an alkylene group having 1 to 6 carbon atoms that is additionally substituted with a cycloalkyl group, a carbocyclic aryl group or a heterocyclic group containing 1 to 3 hetero atoms, or a carbocyclic aryl group having 6 or 10 carbon atoms in the ring, Z− is a monovalent group comprising a single negative charge or an acidic group that is ionized to a single negative charged group at pH of 10 or more, and M+ is a monovalent cat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.