Long-term high temperature and humidity stable holographic optical data storage media compositions with exceptional high dynamic range
US7282322B2 · kind B2 · utility
Inventors
Key dates
| Filing date | May 29, 2003 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | May 18, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/046
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A novel photoimageable system for a two-chemistry system containing liquid photoreactive asymmetric acrylate compound containing sulfur, aromatic moieties, and optionally bromine, and an aluminum salt compound is disclosed. The photoimageable system has high dynamic range (M/#) and sensitivity and unexpectedly high temperature and high humidity resistance. The photoimageable system retains its dynamic range when exposed to 60° C. for 4 weeks while a composition without the aluminum salt compound lost 75% of its dynamic range under similar exposure conditions. In one embodiment, 2-10 weight % of a thio-butylacrylate dissolved in a two-component urethane matrix containing 0.002 to 1 weight % of the aluminum salt compound showed a dynamic range of greater than 5 for a 200 microns thick sample and retained more than 80% of the dynamic range after 4 weeks exposure at 60° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.