Fluorinated surfactants in overcoat compositions and elements containing same
US6875563B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2003 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Nov 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/385
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A coating composition for use in forming an overcoat layer in a photographic element, said composition comprising an aqueous solution of: a mixture of two or more surfactants; a hydrophilic binder; matte beads; and a lubricating agent; wherein one of the surfactants is represented by the following Formula (I) and is the only fluorosurfactant in the composition:Rf—CH2CH2—S-(A)-D (I)where Rf is —(CF2)nCF3, n represents the number of CF2 groups and is 3 or 5 in at least 60% of the Rf groups present, and in the remainder of Rf groups n is 7, 9, or 11.A is a divalent linking group that includes substituted alkylene or alkylene (N-alkylene)amide; andD is an ionic group.A photographic element with an outermost layer containing the coating composition is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.