Patent EP0212907A2 successfully refreshed from Google Patents.
EP0212907A2
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Process for fabricating optical recording media
Assignee: Yamamoto Chemicals Inc
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Filing: 1986-08-05
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Granted: —
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Expires: 2006-08-05
Abstract
Abstract An optical recording medium permitting writing and reading-out of signals has no reflective layer, and is fabricated by coating a transparent thermoplastic resin substrate having pregrooves and pits or holes for preformatting signals with a dye solution of a phthalo/naphthalocyanine dye in an organic solvent, followed by drying the coating. The dye is represented by the general formula wherein M is a metal, metal oxide or metal halide, and L 1 , L 2 , L 3 and L 4 are individually a benzene or naphthalene ring skeleton. L 1 to L 4 can be unsubstituted, or substituted by at least one monovalent substituted -Z selected from the following substituents: -R 1 , -OR 2 , SiR 3 R 3 R5, -SR6, -COR 7 , -COOR 8 , -CONH 9 , -NR 10 R 11 , -R 12 OR 13 , and -R 14 X wherein R 1 - R 14 denote individually a hydrocarbon group having from 1 to 12 carbon atoms and X stands for a halogen atom.
Inventors
- 👤 Sumio Hirose
- 👤 Hiroshi Ozawa
- 👤 Kenji Abe
- 👤 Yoichi Hosono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 07:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/248; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
219 words
A process for the fabrication of an optical recording medium permitting writing and reading-out of signals without any reflective layer made of an inorganic compound, which comprises: (a) providing a phthalo/naphthalocyanine dye represented by the following general formula (I): wherein M means a metal, metal oxide or metal halide, and L 1 , L 2 , L 3 and L 4 mean individually a benzene or naphthalene ring skeleton which is unsubstituted or substituted by at least one monovalent substituent -Z selected from the class consisting of the following substituents: -R 1 , -OR 2 , -SiR 3 R 4 R 5 , -SR 6 , -COR 7 , -CO OR 8, -CONHR 9 , -NR 10 R 11 , -R 12 0R 13 , and -R 14 X wherein R 1 - R 14 denote individually a hydrocarbon group having from 1 to 12 carbon atoms and X stands for a halogen atom; (b) dissolving the phthalo/naphthalocyanine dye in an organic solvent having a solubility parameter preferably smaller than 8.5, thereby preparing a dye solution; and (c) coating the dye solution on a transparent thermoplastic resin substrate surface having pregrooves and pits or holes for preformatting signals, thereby forming a recording layer comprising the phthalo/ naphthalocyanine dye on the pregroove- and pit-or hole-defining surface of the resin substrate.
Claim 2
Dependent Claim
219 words
A process for the fabrication of an optical recording medium permitting writing and reading-out of signals without any reflective layer made of an inorganic compound, which comprises: (a) providing a phthalo/naphthalocyanine dye represented by the following general formula (I): wherein M means a metal, metal oxide or metal halide, and L 1 , L 2 , L 3 and L 4 mean individually a benzene or naphthalene ring skeleton which is unsubstituted or substituted by at least one monovalent substituent -Z selected from the class consisting of the following substituents: -R 1 , -OR 2 , -SiR 3 R 4 R 5 , -SR 6 , -COR 7 , -CO OR 8, -CONHR 9 , -NR 10 R 11 , -R 12 0R 13 , and -R 14 X wherein R 1 - R 14 denote individually a hydrocarbon group having from 1 to 12 carbon atoms and X stands for a halogen atom; (b) dissolving the phthalo/naphthalocyanine dye in an organic solvent having a solubility parameter preferably smaller than 8.5, thereby preparing a dye solution; and (c) coating the dye solution on a transparent thermoplastic resin substrate surface having pregrooves and pits or holes for preformatting signals, thereby forming a recording layer comprising the phthalo/ naphthalocyanine dye on the pregroove- and pit-or hole-defining surface of the resin substrate.
Claim 3
Dependent Claim
37 words
The process according to claim 1, wherein in the phthalo/naphthalocyanine dye represented by the general formula (I), 3 of L 1 , L 2 , L 3 and L 4 are substituted or unsubstituted naphthalene ring skeletons.
Claim 4
Dependent Claim
36 words
The process according to claim 1, wherein in the phthlo/naphthalocyanine dye represented by the general formula (I), L 1 , L 2 , L 3 and L 4 are all substituted or unsubstituted naphthalene ring skeletons.
Claim 5
Dependent Claim
45 words
The process according to any of claims 1 to 3, wherein in the phthalo/naphthalocyanine dye represented by the general formula (I), the total number of carbon atoms in all the substituent or substituents -Z contained per molecule is 20 to 48, preferably 24 to 48.
Claim 6
Dependent Claim
42 words
The process according to any of claims 1 to 4, wherein in the phthalo/naphthalocyanine dye represented by the general formula (I), the substituent -Z is -R 1 , -OR 2 , -SiR 3 R 4 R 5 or - SR 6 .
Claim 7
Dependent Claim
42 words
The process according to any of claims 1 to 5, wherein the organic solvent is selected from saturated aliphatic hydrocarbons, unsaturated aliphatic hydrocarbons, saturated alicyclic hydrocarbons, unsaturated alicyclic hydrocarbons and linear ethers, the solubility parameters of which are all smaller than 8.5.
Claim 8
Dependent Claim
26 words
The process according to any of claims 1 to 6, wherein the pregrooves and pits or holes in the substrate are formed with a thermoplastic resin.
Claim 9
Dependent Claim
19 words
The process according to claim 7, wherein the pregrooves and pits or holes are formed while molding the substrate.
Claim 10
Dependent Claim
153 words
A dye solution for use in making an optical recording medium, which comprises a phthalo/ naphthalocyanine dye dissolved in an organic solvent having a solubility parameter preferably less than 8.5, the dye having the general formula (I) wherein M means a metal, metal oxide or metal halide, and L 1 , L 2 , L 3 and L 4 mean individually a benzene or naphthalene ring skeleton which is unsubstituted or substituted by at least one monovalent substituent -Z selected from the class consisting of the following substituents: -R 1 , -OR 2 , -Si R 3 R 4 R 5, -SR 6 , -COR 7 , -COOR 8 , -CO NHR 9 , -NR 10 R 11 , -R 12 OR 13 , and -R 14 X wherein R 1 - R 14 denote individually a hydrocarbon group having from 1 to 12 carbon atoms and X stands for a halogen atom.
Claim 11
Dependent Claim
153 words
A dye solution for use in making an optical recording medium, which comprises a phthalo/ naphthalocyanine dye dissolved in an organic solvent having a solubility parameter preferably less than 8.5, the dye having the general formula (I) wherein M means a metal, metal oxide or metal halide, and L 1 , L 2 , L 3 and L 4 mean individually a benzene or naphthalene ring skeleton which is unsubstituted or substituted by at least one monovalent substituent -Z selected from the class consisting of the following substituents: -R 1 , -OR 2 , -Si R 3 R 4 R 5, -SR 6 , -COR 7 , -COOR 8 , -CO NHR 9 , -NR 10 R 11 , -R 12 OR 13 , and -R 14 X wherein R 1 - R 14 denote individually a hydrocarbon group having from 1 to 12 carbon atoms and X stands for a halogen atom.
References Cited (Backward Citations)
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