Wash-off film containing synthetic amphoteric polymers
US4735887A · kind A · utility
10Cited by
7References
26Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 27, 1986 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Jun 27, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Sharper edges are obtained in silver halide wash-off films for tanning development when from 5 to 60% of the unhardened gelatin binder in one or more layers is replaced with a synthetic amphoteric polymer consisting essentially of at least one of each of three constituents: (a) carboxylic acid, (b) alkyl primary amine, and (c) secondary and/or tertiary amine, the amphoteric polymer having an isoelectric point of from 4 to 8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.