Viscosity control of photographic melts
US5300418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Apr 16, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/388
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a melt for the coating of a layer in a photographic element and which contains water, gelatin and an anionically charged, hydrophobic group containing compound that is (a) water soluble or soluble in a solution of 5 to 20 percent of water miscible organic solvent, PA0 said melt being further characterized by containing an amount of an amphiphilic compound which is sufficient to reduce the viscosity of said melt, said compound selected from the class consisting of: PA1 Type A: Sugar (saccharidic) compounds, characterized by having one to three hydrophobic groups, each group containing from about 6 to about 22 carbon atoms, and having one or more attached hydrophilic mono- or oligosaccharidic hydrophilic chains that may or may not be terminated by a negatively charged group such as a sulfate, sulfonate or a carboxyl group; and PA1 Type B: Compounds compromising a hydrophobic group having from about 6 to about 22 carbon atoms and having one or two attached hydrophilic chains comprising at least 4 oxyethylene and/or glycidyl ether groups that may or may not be terminated with a negatively charged group such as a sulfate, sulfonate or a carboxy group. and mixtur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.