Hemicyanine dyes and optical recording media using the same

• US 20020001774A1
• Filed: 04/03/2001
• Published: 01/03/2002
• Est. Priority Date: 05/17/2000
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Kyu-youn, Huh, Young-jae, Je, Jong-tae
• Application Number:
  US09/823,761
• Publication Number:
  US 20020001774A1
• Time in Patent Office: Days
• US Class Current: 430/270.18
• CPC Class Codes: C09B 23/145 the ethylene chain carrying an heterocyclic residue, e.g. heterocycle-CH=CH-C6H5
• CPC Class Codes: G11B 7/2472 cyanine
• CPC Class Codes: G11B 7/2533 comprising resins
• CPC Class Codes: G11B 7/2534 polycarbonates [PC]
• CPC Class Codes: G11B 7/2535 polyesters, e.g. PET, PETG or PEN
• CPC Class Codes: G11B 7/256 of layers improving adhesion between layers
• CPC Class Codes: G11B 7/2575 resins
• CPC Class Codes: G11B 7/259 based on silver

Abstract

A hemicyanine dye having formula (1) and an optical recording medium using the hemicyanine dye as an optical recording medium are provided:

where Z is a benzene ring, naphthalene ring or anthracene ring; X₁ is S, O, Se, NR or C(CH₃)₂, where R is hydrogen or an alkyl group of 1 to 5 carbon atoms; R₁ is hydrogen, halogen atoms, an alkyl group of 1 to 3 carbon atoms, a nitro group, an alkoxy group of 1 to 3 carbon atoms or an amine group; each of R₂ and R₄ is an alkyl group of 1 to 5 carbon atoms; R₃ is H, OH, OCOCH₃ or OSO₂C₆H₄Cl; Y is Cl, Br, I, CIO₄, BF₄, BrO₄, PF₆, CH₃SO₃, CF₃SO₃, 4-CH₃C₆H₄SO₃, C₆H₅SO₃, 6-SO₃C₁₀H₆SO₃ or HSO₄; and n is an integer of 0-2. The hemicyanine dye having formula (1) above is easy to synthesize with high yield. Thus, use of the hemicyanine dye as an optical recording material in manufacturing optical recording media can reduce the manufacturing cost.

Claims

1. A hemicyanine dye having formula (1):

2. The hemicyanine dye of claim 1, wherein the hemicyanine dye having formula (1) is a compound having formula (2) or (3):

3. An optical recording medium comprising a transparent substrate with grooves, a recording layer including a laser absorptive dye, formed over the transparent substrate, and a reflective layer and a protective layer formed over the recording layer,

wherein the dye of the recording layer is a hemicyanine dye having formula (1);

where Z is a benzene ring, naphthalene ring or anthracene ring;

X₁ is S, O, Se, NR or C(CH₃)₂, where R is hydrogen or an alkyl group of 1 to 5 carbon atoms;

R₁ is hydrogen, halogen atoms, an alkyl group of 1 to 3 carbon atoms, a nitro group, an alkoxy group of 1 to 3 carbon atoms or an amine group;

each of R₂ and R₄ is an alkyl group of 1 to 5 carbon atoms;

R₃ is H, OH, OCOCH₃ or OSO₂C₆H₄Cl;

Y is Cl, Br, I, ClO₄, BF₄, BrO₄, PF₆, CH₃SO₃, CF₃SO₃, 4-CH₃C₆H₄SO₃, C₆H₅SO₃, 6-SO₃C₁₀H₆SO₃ or HSO₄; and

n is an integer of 0-2.

4. The optical recording medium of claim 3, wherein the hemicyanine dye having formula (1) is a compound having formula (2) or (3):

5. The optical recording medium of claim 3, wherein the hemicyanine dye having formula (1) shows a maximum absorption in the wavelength range of 350-650 nm, and has a reflective index of 1.8-2.3 in the wavelength range of 400-700 nm.

6. The optical recording medium of claim 3, wherein the substrate has a transmittance of 70-99%, and a thickness of 0.01-10 mm.