Low temperature, aqueous ammonia treatment for polycarbonate substrates and optical information media employing same
US5102739A · kind A · utility
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19Claims
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Key dates
| Filing date | Mar 1, 1990 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Mar 1, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a method for preparing an optical information medium which comprises a polycarbonate substrate. A polycarbonate substrate is subjected to an aqueous ammonia solution treatment at a temperature below ambient temperatures and for an extended period of time. This treatment occurs prior to assembly of the optical information medium. Use of the treated polycarbonate substrate in the optical information medium results in the medium exhibiting a high level of performance over an extended useful life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.