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US 6,270,943 B1Granted
Optical recording elements comprising novel metallized azo ether dyes
AssigneeEastman Kodak Company
InventorsDerek D. Chapman, Ann L. Carroll-Lee, Csaba A. Kovacs
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Abstract
Metallized azo ether dyes having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus are disclosed. The phenyl nucleus has an ether substituent ortho to the azo group. The phenyl nucleus is free of strong electron withdrawing substituents. 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) a metallized azo ether dye having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an ether substituent ortho to the azo group and said phenyl nucleus is free of strong electron withdrawing groups and (b) 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) a metallized azo ether dye having an azo group linking a substituted 3-hydroxypyridine nucleus to a phenyl nucleus wherein the phenyl nucleus has an ether substituent ortho to the azo group and said phenyl nucleus is free of strong electron withdrawing groups and (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.