Hydrolyzable diffusion control layers in photographic products
US4547451A · kind A · utility
4Cited by
5References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1985 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Feb 21, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic diffusion transfer film units including polymeric diffusion control layers are disclosed. The diffusion control layers comprise polymers which are hydrolyzable in an alkaline medium so as to convert a layer comprising one or more of the polymers from a condition of impermeability to alkali or materials soluble in or solubilized by an aqueous alkaline processing composition to a condition of substantial permeability thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.