Optical recording medium
AssigneeRicoh Company, Ltd.
InventorsTsutomu Satoh, Shohji Maruyama, Tatsuya Tomura, Noboru Sasa, Yasunobu Ueno, Yasuhiro Higashi, Soh Noguchi
Life of this patent
Estimating the term…
Abstract
An optical recording medium has a substrate, and a recording layer formed thereon which contains at least one formazan chelate compound of formula (I), (II) or wherein A, B, A′, B′, A1, A2, B1, B2, Z, Z1, Z2, M, p, and n are specified in the specification.
Claims15
An optical recording medium comprising a substrate, and a recording layer formed thereon comprising a formazan chelate compound selected from the group consisting of:
- a compound represented by formula (I):
- wherein Z represents a group that forms a polyheterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto, said polyheterocyclic ring being selected from the group consisting of a pyridazine ring, a pyrimidine ring and a triazine ring, A is an alkyl group, an aralkyl group, an aryl group, or cyclohexyl group, B is an aryl group, M represents a bivalent metal atom, and n represents the coordination number of formazan ligands;
- a compound represented by formula (II):
- wherein Z represents a group that forms a polyheterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto, said polyheterocyclic ring being selected from the group consisting of a pyridazine ring, a pyrimidine ring and a triazine ring, A′ represents a five-membered ring or six-membered ring, or a group that constitutes the heterocyclic ring, B′ is an aryl group or an alkyl group, M represents a bivalent metal atom, and n represents the coordination number of formazan ligands;
- and
- a compound represented by formula (III):
- wherein Z1 and Z2 are each a group that forms a heterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto, A1 and A2 are each an alkyl group, an aralkyl group, an aryl group, or cyclohexyl group, B1 and B2 are each an aryl group, p is an integer of 0 or 1, and when p is 1, X is methylene group, or sulfone group, and M represents a bivalent metal atom.
An optical recording medium comprising a substrate, and a recording layer formed thereon comprising a formazan chelate compound represented by formula (I):
- wherein Z represents a group that forms a polyheterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto, said polyheterocyclic ring being selected from the group consisting of a pyridazine ring, a pyrimidine ring and a triazine ring;
- A is an alkyl group, an aralkyl group, an aryl group, or cyclohexyl group;
- B is an aryl group;
- M represents a bivalent metal atom;
- and n represents the coordination number of formazan ligands.
An optical recording medium comprising a substrate, and a recording layer formed thereon comprising a formazan chelate compound represented by formula (II):
- wherein Z represents a group that forms a polyheterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto, said polyheterocyclic ring being selected from the group consisting of a pyridazine ring, a pyrimidine ring and a triazine ring;
- A′ represents a five-membered ring or six-membered ring, or a group that constitutes the heterocyclic ring;
- B′ is an aryl group or an alkyl group;
- M represents a bivalent metal atom;
- and n represents the coordination number of formazan ligands.
An optical recording medium comprising a substrate, and a recording layer formed thereon comprising a formazan chelate compound represented by formula (III):
- where Z1 and Z2are each a group that forms a heterocyclic ring with a carbon atom and a nitrogen atom that are bounded thereto;
- A1 and A2 are each an alkyl group, an aralkyl group, an aryl group, or cyclohexyl group;
- B1 and B2 are each an aryl group;
- p is an integer of 0 or 1, and when p is 1, X is methylene group, or sulfone group;
- and M represents a bivalent metal atom.
Dependencies are inferred from the claim text.