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1. (WO2007001095) OPTICAL INFORMATION-RECORDING MEDIUM AND INFORMATION-RECORDING METHOD
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CLAIMS
1. An optical information-recording medium, comprising a recording layer capable of recording of information by irradiation of a laser beam having a wavelength of 440 nm or less on or above a substrate, the recording layer comprising a dye having two or more independent dye moieties in a molecule that are bound to each other in a manner other than by forming a conjugated bond to the dye moieties.

2. The optical information-recording medium of Claim 1, wherein the dye has a structure represented by the following Formula (1):


wherein in Formula (1), Dye11, Dye12, and Dye2k each represent a dye moiety; L11 and L2k each represent a bivalent connecting group that does not form a π-conjugated bond with the dye moieties bound thereto; n is an integer of 0 to 10; k is an integer of 0 to n; when n is an integer of 2 or more, multiple groups Dye2K may be the same as or different from each other; when n is an integer of 2 or more, multiple groups L2K may be the same as or different from each other; Q represents an ion for neutralizing the electric charge; and y is the number of the ions need for neutralizing the electric charge.

3. The optical information-recording medium of Claim 1 or 2, wherein the dye moiety is an oxonol dye moiety.

4. The optical information-recording medium of Claim 1, wherein the dye is a dye represented by the following Formula (2-1), (2-2), (2-3), (2-4), or (2-5):


Formula (2-2)


wherein in Formulae (2-1), (2-2), (2-3), (2-4) and (2-5) above, R represents a substituent group on the methine carbon; m is an integer of 0 to 1; n is an integer of 0 to 2m+l; when n is an integer of 2 or more, multiple Rs may be the same as or different from each other, or may bind to each other forming a ring; Za5 and Za6 each represent an atom group forming an acidic nucleus; L11 each represent a bivalent connecting group that does not form a π-conjugated bond with the dye moieties bound thereto; Q represents an ion for neutralizing the electric charge; and y is the number of the ions need for neutralizing the electric charge; Y represents any of -O-, -NR1 -or -CR2 R3 -; R1 to R9 each independently represents a hydrogen atom or a substituent group; Z represents a substituted or unsubstituted alkylene group; and x is 1 or 2; G represents an oxygen atom or sulfur atom.

5. The optical information-recording medium of Claim 4, wherein m in the Formula (2-1), (2-2), (2-3), (2-4), and (2-5) is 0.

6. The optical information-recording medium of Claim 5, wherein the dye is a dye represented by the following Formula (5-1), (5-2), (5-3), (5-4), or (5-5):

wherein in Formulae (5-1), (5-2), (5-3), (5-4), and (5-5) above, R represents a substituent group on the methine carbon; Q represents an ion for neutralizing the electric charge; y is the number of the ions needed for neutralizing the electric charge; Y is any of -O-, -NR1 -and-CR2 R3 -; Z represents a substituted or unsubstituted alkylene group; x is 1 or 2; and R1 to R9 each independently represents a hydrogen atom or a substituent group; and G represents an oxygen atom or sulfur atom.

7. The optical information-recording medium of Claim 1, further comprising a light-reflective layer made of metal in addition to the recording layer.

8. The optical information-recording medium of Claim 1, further comprising a protective layer in addition to the recording layer.

9. The optical information-recording medium of Claim 1, wherein the substrate is a transparent disk-shaped substrate with a pre-groove having a track pitch of 50 to 600 nm formed on its surface and the recording layer is formed on the surface of the substrate on the pre-groove-side.

10. A method of recording information, comprising recording information by irradiating a laser beam having a wavelength of 440 nm or less onto an optical
information-recording medium having a recording layer on or above a substrate the recording layer comprising a dye having two or more independent dye moieties in a molecule that are bound to each other in a manner other than by forming a conjugated bond to the dye moieties.