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CN-117396959-B - Recording medium, information recording method, information reading method, and composition for producing recording layer

CN117396959BCN 117396959 BCN117396959 BCN 117396959BCN-117396959-B

Abstract

The recording medium according to an aspect of the present disclosure includes a recording layer. The recording layer includes an aliphatic polymer, and a multiphoton absorption compound having multiphoton absorption characteristics, which includes at least one selected from the group consisting of a carbon-carbon double bond, a carbon-nitrogen double bond, and a carbon-carbon triple bond. When the thickness of the recording layer is 100 μm, the transmittance of the recording layer in the thickness direction for light having a wavelength of 405nm is 80% or more.

Inventors

  • ANDO KOTA
  • Yokoyama maiko
  • SAKATA NAOMI
  • TAGASHIRA KENJI
  • ARAKI HIDEKAZU

Assignees

  • 松下知识产权经营株式会社

Dates

Publication Date
20260512
Application Date
20220516
Priority Date
20210604

Claims (14)

  1. 1. A recording medium having at least one recording layer, wherein, The at least one recording layer includes: Aliphatic polymer, and A multiphoton absorption compound having multiphoton absorption characteristics, which contains at least one selected from the group consisting of a carbon-carbon double bond, a carbon-nitrogen double bond, and a carbon-carbon triple bond, When the thickness of the at least one recording layer is 100 [ mu ] m, the transmittance of the at least one recording layer in the thickness direction for light having a wavelength of 405nm is 80% or more.
  2. 2. The recording medium of claim 1, wherein, In the at least one recording layer, a total value of the content of the aliphatic polymer and the content of the multiphoton absorption compound is 95 wt% or more.
  3. 3. The recording medium according to claim 1 or 2, wherein, The aliphatic polymer comprises structural units derived from an aliphatic monomer, The aliphatic monomer includes at least one selected from the group consisting of acryl, methacryl, epoxy, oxetanyl, and vinyl.
  4. 4. The recording medium according to claim 3, wherein, The aliphatic monomer includes at least one selected from the group consisting of acryl, methacryl, and epoxy.
  5. 5. The recording medium according to claim 3, wherein, The aliphatic monomer contains at least one selected from the group consisting of a compound A represented by the following formula (A), a compound B represented by the following formula (B), a compound C represented by the following formula (C), a compound D represented by the following formula (D), a compound E represented by the following formula (E), a compound F represented by the following formula (F) and a compound G represented by the following formula (G), [ Chemical formula number 1] In the formula (A), R 1 is a hydrogen atom or methyl, R 2 is an aliphatic group, In the formula (B), R 3 and R 5 are independently a hydrogen atom or a methyl group, R 4 is an aliphatic group, In the formula (C), R 6 is a hydrogen atom or a methyl group, R 7 is an aliphatic group, R 8 is a hydrogen atom or an aliphatic group, In the formula (D), R 9 is a hydrogen atom or a methyl group, R 10 is an aliphatic group, R 11 is a hydrogen atom or an aliphatic group, In the formula (E), R 12 and R 14 are each independently a hydrogen atom or an aliphatic group, R 13 is an aliphatic group, In the formula (F), R 15 and R 17 are each independently a hydrogen atom or an aliphatic group, R 16 is an aliphatic group, In the formula (G), R 18 and R 20 are each independently a hydrogen atom or an aliphatic group, and R 19 is an aliphatic group.
  6. 6. The recording medium of claim 5, wherein, The compound A contains at least one selected from the group consisting of a compound A1 represented by the following formula (A1) and a compound A2 represented by the following formula (A2), [ Chemical formula number 2] In the formula (A1), n is an integer of 0 to 11.
  7. 7. The recording medium according to claim 5 or 6, wherein, The compound B comprises a compound B1 represented by the following formula (B1), [ Chemical formula number 3] In the formula (B1), m is an integer of 1 to 4.
  8. 8. The recording medium according to any one of claims 5 to 7, wherein, The compound E contains at least one selected from the group consisting of a compound E1 represented by the following formula (E1), a compound E2 represented by the following formula (E2), and a compound E3 represented by the following formula (E3), [ Chemical formula number 4] In the formula (E1), x is an integer of 1 to 12, In the formula (E3), y is an integer of 1 to 11.
  9. 9. The recording medium according to any one of claims 1 to 8, wherein, The multiphoton absorption compound includes an aromatic ring.
  10. 10. The recording medium according to any one of claims 1 to 9, wherein, The recording medium is further provided with a plurality of dielectric layers, The at least one recording layer comprises a plurality of recording layers, The plurality of recording layers and the plurality of dielectric layers are alternately arranged.
  11. 11. The recording medium according to any one of claims 1 to 10, which records information using light having a wavelength of 390nm or more and 420nm or less.
  12. 12. A recording method of information, comprising: preparing a light source for emitting light having a wavelength of 390nm or more and 420nm or less, and Condensing the light from the light source and irradiating onto the at least one recording layer in the recording medium according to any one of claims 1 to 11.
  13. 13. A method for reading information recorded by the recording method according to claim 12, The readout method includes: determining an optical property of the at least one recording layer by irradiating the at least one recording layer with light, and Information is read out from the at least one recording layer.
  14. 14. A composition for producing a recording layer having a transmittance of 80% or more in the thickness direction of light having a wavelength of 405nm when the thickness is 100[ mu ] m, The composition comprises: Aliphatic monomer, and A multiphoton absorption compound having multiphoton absorption characteristics, which comprises at least one selected from the group consisting of a carbon-carbon double bond, a carbon-nitrogen double bond, and a carbon-carbon triple bond.

Description

Recording medium, information recording method, information reading method, and composition for producing recording layer Technical Field The present disclosure relates to a recording medium, a recording method of information, a reading method of information, and a composition for producing a recording layer. Background As a technique for increasing the recording capacity of an optical information recording medium, three-dimensional recording of information on a multilayer body is known. In the field of three-dimensional recording, it is necessary to realize finer condensed spots in order to increase recording density. From the standpoint of diffraction limit of the laser light after being condensed, a laser light having a short wavelength is used in order to realize a finer condensed point. As the laser light, a laser light having a center wavelength of 405nm, which is a standard of a Blu-ray (registered trademark) disc, is exemplified. As described above, an optical information recording medium using a laser beam having a center wavelength of 405nm is known. Examples of the related art of three-dimensional recording include optical information recording media in which a photosensitive material, a dye, or the like is dispersed in a resin, optical information recording media in which cavities or irregularities functioning as recording marks are arranged in three dimensions, and optical information recording media in which diffraction gratings are formed by interference of light beams from two systems to form minute holograms therein. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-58283 Patent document 2 Japanese patent No. 5929109 Patent document 3 Japanese patent No. 6154898 Patent document 4 Japanese patent application laid-open No. 2008-261928 Disclosure of Invention Problems to be solved by the invention In the recording layer of a recording medium, it is required to suppress an increase in single photon absorption of light having a wavelength in a short wavelength region. Means for solving the problems The recording medium in an aspect of the present disclosure is provided with at least one recording layer. The at least one recording layer includes an aliphatic polymer, and a multiphoton absorption compound having multiphoton absorption characteristics, which includes at least one selected from the group consisting of a carbon-carbon double bond, a carbon-nitrogen double bond, and a carbon-carbon triple bond. When the thickness of the at least one recording layer is 100 [ mu ] m, the transmittance of the at least one recording layer in the thickness direction for light having a wavelength of 405nm is 80% or more. Effects of the invention The present disclosure provides a recording medium having a recording layer that suppresses an increase in single photon absorption of light having a wavelength of a short wavelength region. Drawings Fig. 1 is a cross-sectional view showing a schematic configuration of a recording medium according to an embodiment of the present disclosure. Fig. 2A is a flowchart showing a method of recording information using a recording medium according to an embodiment of the present disclosure. Fig. 2B is a flowchart showing a method for reading information using a recording medium according to an embodiment of the present disclosure. FIG. 3 is a graph showing 1 H-NMR spectrum of compound K. FIG. 4 is a graph showing 1 H-NMR spectrum of compound L. Detailed Description (Insight underlying the present disclosure) Patent document 1 discloses that an optical recording resin layer is produced by heating a mixture of an epoxy compound and a curing agent to polymerize and cure the mixture. Patent document 1 discloses recording information on an optical recording medium having one optical recording resin layer using a laser light having a wavelength of 405 nm. Patent document 2 discloses a method of manufacturing a recording layer by heating and curing a mixture of an ethynylbenzophenone compound, an epoxy compound, and a curing agent that exhibits a nonlinear light absorption effect. In patent document 2, an epoxy compound has an aromatic ring. Patent document 2 discloses recording information on an optical information recording medium having one recording layer using a laser beam having a wavelength of 405 nm. Patent document 3 discloses a recording layer containing a dye-bonded polymer compound in which a polymer compound is bonded to a single photon-absorbing dye. Patent document 3 discloses recording information on an optical information recording medium having a plurality of recording layers. Patent document 4 discloses a resin material for optical recording in which a photopolymerizable monomer and a photoinitiator are dispersed in an epoxy resin. In patent document 4, holographic recording is possible with an optical recording medium having a recording layer formed of an optical recording resin material. As the recording lay