Optical information recording medium

• US 5,998,093 A
• Filed: 01/29/1997
• Issued: 12/07/1999
• Est. Priority Date: 01/29/1996
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Satoh, Tsutomu, Sasa, Noboru, Higashi, Yasuhiro, Ueno, Yasunobu, Tomura, Tatsuya
• Primary Examiner(s): McPherson, John A.
• Application Number:
  US08/790,433
• Time in Patent Office: 1,042 Days
• Field of Search: 430/270.16, 430/945, 369/284, 369/288, 428/64.8
• US Class Current: 430/270.16
• CPC Class Codes: C09B 67/0035 Mixtures of phthalocyanines
• CPC Class Codes: G11B 7/248 porphines; azaporphines, e.g. phthalocyanines
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

An optical information recording medium includes a substrate, and a recording layer formed on the substrate, the recording layer containing at least one compound selected from the group consisting of a compound represented by formula (I): ##STR1## and a compound represented by formula (II): ##STR2##

Claims

1. An optical information recording medium comprising:

a substrate, and

a recording layer formed on said substrate, said recording layer comprising at least one compound represented by formula (I);

##STR88## wherein;

M represents a bivalent, trivalent or tetravalent metal selected from the group consisting of Ca, Mg, Cu, Ni, Pd, Pb, Pt, Cd, Ru, In, Ga, Ti, Mn, Ti, Sn, Cr and Ga to which there may be bonded at least one oxygen atom or at least one halogen atom, or said bivalent, trivalent or tetravalent metal to which there may be bonded an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted alkoxyl group, an unsubstituted or substituted aryloxy group, --(OPR¹ R²)_p, --(OPOR³ R⁴)_p, --(OSiR⁵ R⁶ R⁷)_p, --(OCOR⁸)_p, --(OR⁹)_p, --(OCOCOOR¹⁰)_p, --(OCOCOR¹¹)_p or --(OCONR¹² R¹³)_p in which R¹ to R¹³ are each independently a hydrogen atom, an unsubstituted or substituted monovalent aliphatic hydrocarbon group, or an unsubstituted or substituted monovalent aromatic hydrocarbon group, and p is an integer of 0 to 2, and

X¹ to X⁸ are each independently a hydrogen atom, a halogen atom, a cyano group, an unsubstituted or substituted straight-chain or branched alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl acid ester group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, an unsubstituted or substituted alkylthio group, an unsubstituted or substituted arylthio group, an unsubstituted or substituted benzyl group, an unsubstituted or substituted benzyloxy group, an unsubstituted or substituted benzylthio group or a heterocyclic group;

provided that at least one of X¹ to X⁸ is an unsubstituted or substituted alkoxyl group, a halogen atom or a cyano group.

2. The optical information recording medium as claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each independently a hydrogen atom or an unsubstituted or substituted straight-chain or branched alkyl group, and X⁵ to X⁸ are each independently a hydrogen atom, an unsubstituted or substituted alkoxyl group or a halogen atom, provided that X¹ to X⁸ cannot be a hydrogen atom at the same time.

3. The optical information recording medium as claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each independently a hydrogen atom or an unsubstituted or substituted straight-chain or branched alkyl group, and X⁵ to X⁸ are each independently a hydrogen atom or a halogen atom, provided that X¹ to X⁸ cannot be a hydrogen atom at the same time.

4. The optical information recording medium as claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each independently a hydrogen atom, an unsubstituted or substituted straight-chain or branched alkyl group, or an unsubstituted or substituted alkoxyl group, and X⁵ to X⁸ are each independently an unsubstituted phenyl group or a substituted phenyl group with at most two substituents which are selected from the group consisting of a straight chain or branched alkyl group which may be substituted with a halogen atom, an unsubstituted or substituted alkoxyl group, and an aryl group which may be substituted with a halogen atom.

5. The optical information recording medium an claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each a cyano group, and X⁵ to X⁸ are each independently an unsubstituted or substituted, straight chain or branched alkyl group.

6. The optical information recording medium as claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each a cyano group, and X⁵ to X⁸ are each independently an unsubstituted or substituted aryl group.

7. The optical information recording medium as claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each a cyano group, and X⁵ to X⁸ are each independently a substituted phenyl group, with at least one of the substituents thereof being selected from the group consisting of a fluorine atom, a fluorine atom bonded alkyl group and a fluorine atom bonded alkoxyl group.

8. The optical information recording medium an claimed in claim 1, wherein in the formula (I), X¹ to X⁴ are each independently a hydrogen atom or an unsubstituted or substituted straight chain or branched alkyl group, and X⁵ to X⁸ are each independently a hydrogen atom, an unsubstituted or substituted straight chain or branched alkyl group, or a halogen atom.

9. The optical information recording medium as claimed in claim 8, wherein in the formula (I), X¹ is not the same as X⁵ (X¹ ≠

X⁵), X² is not the same as X⁶ (X² ≠

X⁶), X³ is not the same as X⁷ (X³ ≠

X⁷), and X⁴ is not the same as X⁸ (X⁴ ≠

X⁸).

10. The optical information recording medium as claimed in claim 1, wherein said recording layer further comprises at least one organic dye having a maximum absorption wavelength in the range of 680 nm to 750 nm.

11. The optical information recording medium as claimed in claim 10, wherein said organic dye having a maximum absorption wavelength in the range of 680 nm to 750 nm is selected from the group consisting of a cyanine dye, a phthalocyanine dye and an azo metal chelate dye.

12. The optical information recording medium as claimed in claim 1, wherein said recording layer is capable of recording information with the application of a laser beam with a wavelength of 630 nm to 720 nm thereto.

13. The optical recording medium as claimed in claim 1, further comprising an undercoat layer between said substrate and said recording layer.

14. The optical information recording medium as claimed in claim 1, further comprising a reflection layer on said recording layer.

15. The optical information recording medium as claimed in claim 14, further comprising a protective layer on said reflection layer.

16. The optical information recording medium as claimed in claim 14, wherein said reflection layer comprises a material selected from the group consisting of aluminum and gold.

17. The optical information recording medium as claimed in claim 1, further comprising a protective layer on said recording layer.

18. The optical information recording medium as claimed in claim 17, wherein said protective layer comprises an ultraviolet-curing resin.

19. An optical information recording medium comprising:

a substrate, and

a recording layer formed on said substrate, said recording layer comprising at least one compound represented by formula (II);

##STR89## wherein;

M represents two independent hydrogen atoms, a bivalent, trivalent or tetravalent metal to which there may be bonded at least one oxygen atom or at least one halogen atom, or a bivalent, trivalent or tetravalent metal to which there may be bonded an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted alkoxyl group, an unsubstituted or substituted aryloxy group, --(OPR¹ R²)_p, --(OPOR³ R⁴)_p, --(OSiR⁵ R⁶ R⁷)_p, --(OCOR⁸)_p, --(OR⁹)_p, --(OCOCOOR¹⁰)_p, --(OCOCOR¹¹)_p or --(OCONR¹² R¹³)_p in which R¹ to R¹³ are each independently a hydrogen atom, an unsubstituted or substituted monovalent aliphatic hydrocarbon group, or an unsubstituted or substituted monovalent aromatic hydrocarbon group, and p is an integer of 0 to 2, and

X¹ to X⁸ are each independently a hydrogen atom, a halogen atom, a cyano group, an unsubstituted or substituted straight-chain or branched alkyl group, an unsubstituted or substituted alkoxyl group, a carboxyl acid ester group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, an unsubstituted or substituted alkylthio group, an unsubstituted or substituted arylthio group, an unsubstituted or substituted benzyl group, an unsubstituted or substituted benzyloxy group, an unsubstituted or substituted benzylthio group or a heterocyclic group.

20. The optical information recording medium as claimed in claim 19, wherein said recording layer further comprises at least one organic dye having a maximum absorption wavelength in the range of 680 nm to 750 nm.

21. The optical information recording medium as claimed in claim 20, wherein said organic dye having a maximum absorption wavelength in the range of 680 nm to 750 nm is selected from the group consisting of a cyanine dye, a phthalocyanine dye and an azo metal chelate dye.

22. The optical information recording medium as claimed in claim 19, wherein said recording layer is capable of recording information with the application of a laser beam with a wavelength of 630 nm to 720 nm thereto.

23. The optical recording medium as claimed in claim 19, further comprising an undercoat layer between said substrate and said recording layer.

24. The optical information recording medium as claimed in claim 19, further comprising a reflection layer on said recording layer.

25. The optical information recording medium as claimed in claim 24, further comprising a protective layer on said reflection layer.

26. The optical information recording medium as claimed in claim 24, wherein said reflection layer comprises a material selected from the group consisting of aluminum and gold.

27. The optical information recording medium as claimed in claim 19, further comprising a protective layer on said recording layer.

28. The optical information recording medium as claimed in claim 27, wherein said protective layer comprises an ultraviolet-curing resin.