Optical recording elements containing mixture of metallized azo ether and cyanine dyes
AssigneeEastman Kodak Company
InventorsDerek D. Chapman, Ann L. Carroll-Lee, Csaba A. Kovacs
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Abstract
An optical recording element having a transparent substrate and on the surface of said substrate, a recording layer, a light reflecting layer is disclosed. The recording layer comprises (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) a cyanine dye. The recording layer also 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 0.2.
Claims11
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 (a) comprises a (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) a cyanine dye 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 0.2.
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 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) a cyanine dye and (iii) 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 0.2;
- (c) a light reflecting layer;
- (d) an adhesive layer;
- and
- (e) a substrate.
Dependencies are inferred from the claim text.