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US 6,447,981 B1Granted
Metallized azo thioether dyes
AssigneeEastman Kodak Company
InventorsDerek D. Chapman, Csaba A. Kovacs
Life of this patent
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Abstract
Metallized azo thioether dyes having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus are disclosed. The phenyl nucleus has an thioether substituent ortho to the azo group but does not have electron withdrawing substituents on the phenyl nucleus. The dyes are useful in optical recording elements.
Claims10
An optical recording element having a transparent substrate and on the surface of said substrate, a recording layer, a light reflecting layer;
- wherein the recording layer comprises a metallized azo thioether dye having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an thioether substituent ortho to the azo group and is free of electron withdrawing groups on the phenyl ring and has, when unrecorded, a refractive index at a selected wavelength from 400 to 660 nm, comprising a real part (n) greater than 1.8 and an imaginary part (k) less than 0.3.
An optical recording element having the following layer arrangement:
- (a) a transparent grooved substrate having a groove width of from 100 to 800 nm;
- a groove depth of 30 to 270 nm;
- and a groove pitch of 0.5 to 1.8 μm;
- (b) a recording layer (i) comprising a metallized azo thioether dye having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an thioether substituent ortho to the azo group and is free of electron withdrawing groups on the phenyl ring (ii) having, when unrecorded, a refractive index at a selected wavelength from 400 to 660 nm, comprising a real part (n) greater than 1.8 and an imaginary part (k) less than 0.3;
- (c) a light reflecting layer;
- (d) an adhesive layer;
- and
- (e) a substrate.
5 more elements
Dependencies are inferred from the claim text.