Optical recording elements having recording layers exhibiting reduced bubble formation
AssigneeEastman Kodak Company
InventorsElizabeth G. Burns, James C. Fleming
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Abstract
The present invention discloses an optical recording element having, in the following order, a transparent substrate, a recording layer and a light reflecting layer wherein the recording layer (A) has a real refractive index (N) at 780 nm not less than 1.8 and an imaginary part (k) is not greater than 0.15; (B) comprises a polymeric cyanine dye that (i) has both a weight-average molecular weight greater than 50,000 and a glass transition temperature (Tg) of less than 150.degree. C.; or (ii) has either (a) a weight-average molecular weight greater than 50,000 or (b) a glass transition temperature (Tg) of less than 150.degree. C.; and (C) a thickness greater than 200 nm.
Claims7
An optical recording element having, in the following order, a transparent substrate, a recording layer and a light reflecting layer wherein the recording layer
- (A) has a real refractive index (N) at 780 nm not less than 1.8 and an imaginary part (k) is not greater than 0.15;
- (B) comprises a polymeric cyanine dye that (i) has both a weight-average molecular weight greater than 50,000 and a glass transition temperature (Tg) of less than 150.degree. C.;
- or (ii) has either (a) a weight-average molecular weight greater than 50,000 or (b) a glass transition temperature (Tg) of less than 150.degree. C.;
- and
- (C) a thickness greater than 200 nm.
Dependencies are inferred from the claim text.