Patent EP0321704A2 successfully refreshed from Google Patents.
EP0321704A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Teijin Ltd
•
Filing: 1988-11-19
•
Granted: —
•
Expires: 2008-11-19
Abstract
Abstract An optical recording medium, particularly a magneto-optical recording medium, resistant to oxidation deterioration even in a hot and humid atmosphere, is provided by forming an organic protecting adhesive layer (4) of a UV-cured resin having an acid value of not more than 1.5; and a softening point of not less than 50°C. The UV-cured resin layer comprises 15 to 85% by weight of acrylate and/or methacrylate having at least three functionalities; 15 to 70% by weight of a compound having a linear structure and having a molecular weight of at least 300, the compound preferably having at least one ethylenically unsaturated bond and a molecular weight of at least 150 per ethylenically unsaturated bond; and a photopolymerization initiator.
Inventors
- 👤 Eiichi Hashimoto
- 👤 Tetsuo Sato
- 👤 Kiyoshi Chiba
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:28
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B7/00; G11B7/24; G11B7/2403; G11B7/24053; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B7/257; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B2007/25716; G11B7/253; G11B7/2533; G11B7/2534; G11B7/256; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
An optical recording medium, comprising: a hard plastic substrate; an optical recording film formed over said hard plastic substrate; and a UV-cured resin layer formed over said optical recording film, wherein said UV-cured resin layer has an acid value of not more than 1.5.
Claim 2
Dependent Claim
44 words
An optical recording medium, comprising: a hard plastic substrate; an optical recording film formed over said hard plastic substrate; and a UV-cured resin layer formed over said optical recording film, wherein said UV-cured resin layer has an acid value of not more than 1.5.
Claim 3
Dependent Claim
36 words
An optical recording medium according to claim 1, wherein said optical recording film is a magneto-optical recording film of an amorphous film consisting of at least one rare earth metal and at least one transition metal.
Claim 4
Dependent Claim
20 words
A medium according to claim 1 or 2, further comprising another hard plastic substrate formed over said UV-cured resin layer.
Claim 5
Dependent Claim
24 words
A medium according to claim 3, further comprising another optical recording layer formed between said UV-cured resin layer and said another hard plastic substrate.
Claim 6
Independent Claim
25 words
A medium according to one or several of claims 1 to 4, wherein said UV-cured resin layer has a softening point not lower than 50°C.
Claim 7
Independent Claim
34 words
A medium according to one or several of claims 1 to 5, wherein said UV-cured resin layer has an acid value of not more than 0.1 and a softening point not lower than 115°C.
Claim 8
Independent Claim
85 words
A medium according to one or several of claims 1 to 6, wherein said UV-cured resin layer is formed by curing a UV-curable resin composition which comprises: (a) 15 to 85% by weight of a first ingredient of an acrylate and/or a methacrylate having at least three functionalities; (b) 15 to 70% by weight of a second ingredient of a compound having a linear structure and a molecular weight of at least 300; and (c) at least 0.3% by weight of a photo polymerization initiator.
Claim 9
Dependent Claim
34 words
A medium according to claim 7, wherein said second ingredient is an addition polymerizable compound having at least one ethylenically unsaturated bond and a molecular weight of at least 150 per ethylenically unsaturated bond.
Claim 10
Dependent Claim
19 words
A medium according to claim 8, wherein said second ingredient is a phenol-based novolak epoxy acrylate or methacrylate compound.
Claim 11
Dependent Claim
40 words
A medium according to claim 7, wherein said UV-curable resin composition comprises 25 to 75% by weight of said first ingredient, 25 to 55% by weight of said second ingredient and at least 0.3% by weight of said photopolymerization initiator.
Claim 12
Dependent Claim
34 words
A medium according to claim 7, wherein said UV-curable resin composition further comprises d) not more than 40% by weight of a third ingredient of an acrylate or methacrylate having one or two functionalities.
Claim 13
Dependent Claim
22 words
A medium according to claim 7, wherein said second ingredient has a molecular weight of more than 1000 per ethylenically unsaturated bond.
Claim 14
Independent Claim
24 words
A medium according to one or several of claims 1 to 12, further comprising an inorganic layer between said recording film and said substrate.
Claim 15
Dependent Claim
78 words
A process for manufacturing an optical recording medium, said process comprising the steps of: forming an optical recording film over a hard plastic substrate; coating a UV-curable resin composition over said optical recording film to form a UV-curable resin layer, said UV-curable resin composition having an acid value of not more than 1.5 and a viscosity of 10 to 5,000 cps at 25°C; and irradiating said UV-curable resin layer with UV rays to form said UV-cured resin layer.
Claim 16
Dependent Claim
78 words
A process for manufacturing an optical recording medium, said process comprising the steps of: forming an optical recording film over a hard plastic substrate; coating a UV-curable resin composition over said optical recording film to form a UV-curable resin layer, said UV-curable resin composition having an acid value of not more than 1.5 and a viscosity of 10 to 5,000 cps at 25°C; and irradiating said UV-curable resin layer with UV rays to form said UV-cured resin layer.
Claim 17
Dependent Claim
19 words
A process according to claim 14, wherein said UV-cured resin layer has a softening point not lower than 50°C.
Claim 18
Dependent Claim
28 words
A process according to claim 14, wherein said UV-cured resin layer has an acid value of not more than 0.1 and a softening point not lower than 115°C.
Claim 19
Dependent Claim
70 words
A process according to claim 14, wherein said UV-curable resin composition comprises: (a) 15 to 85% by weight of a first ingredient of an acrylate and/or a methacrylate having at least three functionalities; (b) 15 to 70% by weight of a second ingredient of a compound having a linear structure and a molecular weight of at least 300; and (c) at least 0.3% by weight of a photo polymerization initiator.
Claim 20
Dependent Claim
35 words
A process according to claim 14, further comprising the step of placing another hard plastic substrate over said UV-curable resin layer between said steps of forming the UV-curable resin layer and the UV irradiation thereof.
Claim 21
Dependent Claim
40 words
A process according to claim 18, wherein said another hard plastic substrate includes another optical recording film on a side thereof and said another optical recording film is located between said another hard plastic substrate and said UV-cured resin layer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.