Use of .alpha.,.alpha.-bis(dialkylaminobenzylidene) ketone dyes in optical recording elements
US4415621A · kind A · utility
26Cited by
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10Claims
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Key dates
| Filing date | Feb 11, 1982 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Feb 11, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Dyes conforming to the structure: ##STR1## wherein R.sub.1 is (CH.sub.2).sub.n or ##STR2## n is an integer from 0-5 and each R is independently selected from the group consisting of straight- and branched-chain alkyl groups of about 1-6 carbon atoms, have a high extinction coefficient at 488 nm and are compatible with common binders such as cellulose-nitrate. These dyes are useful in deformable recording compositions for optical recording elements, e.g., video discs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.