Support with reduced optical brightener migration
US6818367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2003 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Apr 15, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/134
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an imaging element comprising an imaging layer and a support, wherein the support comprises a base material having thereon at least two polyolefin layers, wherein the uppermost layer of the at least two polyolefin layers comprises a mixture of optical brighteners comprising a Compound A having the following formula: a Compound B having the following formula: and a Compound C having the following formula: wherein the layers below the uppermost layer of the at least two polyolefin layers comprise migratory optical brightener; and wherein the imaging layer is on the same side of the base material as the at least two polyolefin layers. The inventive support unexpectedly minimizes exudation of the brightener at the polyolefin surface and provides excellent absorption/emission characteristics, brightening power and heat to meet the critical requirements of the photographic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.