Subbed polyester film support carrying carbon black antihalation layer
US4990434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1989 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Sep 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/93
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a photographic element comprising a dimensionally stable hydrophobic transparent polyester film support, at least one light-sensitive silver halide emulsion layer, and at the side of said support opposite to that of said emulsion layer(s), a subbing layer essentially consisting of poly-N-vinyl pyrrolidone, and an antihalation layer comprising carbon black dispersed in a water-insoluble alkali-soluble copolymer of 1 to 65% by weight of a C.sub.1 -C.sub.4 alkyl methacrylate, 10 to 79% by weight of a C.sub.1 -C.sub.8 alkyl acrylate, and 10 to 50% by weight of acrylic acid or methacrylic acid. The present invention also provides a process of manufacturing a dimensionally stable hydrophobic transparent polyester film support carrying a subbing layer and an alkali-soluble carbon black antihalation layer, said process comprising monoaxially stretching an extruded amorphous polyester film, coating it with an aqueous solution of poly-N-vinyl pyrrolidone to form said subbing layer, drying it, stretching it together with said film in a direction perpendicular to that of the first stretching, heat-setting, coating the film support with an aqueous dispersion of ca…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.