Silver halide emulsion containing acrylic amphoteric polymers
US5187059A · kind A · utility
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19References
6Claims
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Assignee
Inventor
Key dates
| Filing date | Feb 5, 1991 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Feb 5, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Amphoteric polymers prepared by polymerization of (a) acrylic acid, (b) N,N-dimethyl- or N,N-diethylaminoethyl methacrylate and, optionally, (c) esters of methacrylic or acrylic acid prepared by (i) emulsion polymerization of (b), (c) and the methyl ester of (a), followed by basic hydrolysis, or (ii) polymerization of (a), (b) and (c) in the presence of a strong acid, and photographic emulsions comprised of said polymers in which the molar ratio of (a) to (b) is at least 2 to 1 and a silver halide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.