Optical information recording medium using a phthalocyanine compound

• US 5,863,703 A
• Filed: 02/12/1996
• Issued: 01/26/1999
• Est. Priority Date: 02/10/1995
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Tomura, Tatsuya, Sato, Tsutomu, Sasa, Noboru
• Primary Examiner(s): McPherson, John A.
• Application Number:
  US08/601,433
• Time in Patent Office: 1,079 Days
• Field of Search: 430/270.15, 430/270.16, 430/270.17, 430/945, 369/284, 369/288
• US Class Current: 430/270.16
• CPC Class Codes: G11B 7/248 porphines; azaporphines, e.g. phthalocyanines
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

A phthalonitrile compound of formula (I); ##STR1## and a diiminoisoindoline compound of formula (II): ##STR2## are allowed to react to produce a phthalocaynine compound of formula (III), ##STR3## which is an effective material for a near-infrared absorbing material and also as a recording material for an optical information recording medium. The methods of producing the phthalonitrile compound of formula (I) and the pthalocaynine compound of formula (III) are proposed.

Claims

1. An optical information recording medium comprising a substrate, and a recording layer formed thereon comprising a phthalocyanine compound of formula I-(III):

##STR124## wherein M represents two hydrogen atoms, or a bivalent, trivalent or tetravalent metal which may have a halogen atom or an oxygen atom;

X¹ to X⁴ are each an oxygen atom or sulfur atom;

R¹ to R⁴ are each a cyclic substituent selected from the group consisting of cyclic substituents (a) to (f), each of which may independently have a substituent;

##STR125## and k, l, m, and n are each an integer of 0 to 4, provided that k, l, m, and n are not 0 at the same time, and that when each of k, l, m and n is 3 or less, the other substituents for each benzene ring are a hydrogen atom or a halogen atom.

2. The optical information recording medium as claimed in claim 1, further comprising an undercoat layer which is provided between said substrate and said recording layer.

3. The optical information recording medium as claimed in claim 2, further comprising a protective layer which is provided on said recording layer.

4. The optical information recording medium as claimed in claim 1, further comprising a protective layer which is provided on said recording layer.

5. The optical information recording medium as claimed in claim 4, further comprising a metal reflection layer which is provided between said recording layer and said protective layer.

6. The optical information recording medium as claimed in claim 1, wherein each of k, l, m and n is an integer of 1 or 2, one or two substituents are bonded to each benzene ring at the position 1 and/or 4, and the other substituents are a hydrogen atom or a halogen atom in said phthalocyanine compound of formula I-(III).

7. The optical information recording medium as claimed in claim 6, further comprising an undercoat layer which is provided between said substrate and said recording layer.

8. The optical information recording medium as claimed in claim 7, further comprising a protective layer which is provided on said recording layer.

9. The optical information recording medium as claimed in claim 6, further comprising a protective layer which is provided on said recording layer.

10. The optical information recording medium as claimed in claim 9, further comprising a metal reflection layer which is provided between said recording layer and said protective layer.