US5173391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Canon Inc
•
Filing: 1990-11-13
•
Granted: 1992-12-22
•
Expires: 2010-11-13
Abstract
Abstract An optical recording medium comprises an optical recording layer provided on a substrate, a protective material and a bond layer for bonding the optical recording layer to the protective material, the bond layer having a thermoplastic adhesive comprising at least one of (A) at least one selected from an ethylene-acrylic acid copolymer and an ethylene-acrylate ester copolymer and (B) an ethylene-maleic anhydride-acrylic acid terpolymer; and (C) a tackifier.
Inventors
- 👤 Mizuho Hiraoko
- 👤 Hiroyuki Imataki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/256; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/245; G11B7/2463; G11B7/2472; G11B7/248; G11B7/249; G11B7/253; G11B7/2533; G11B7/2534; G11B7/2535; G11B7/2539; G11B7/254; G11B7/2542; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/25; Y10T428/31504; Y10T428/31507; Y10T428/31533; Y10T428/31721; Y10T428/31826; Y10T428/31833; Y10T428/31837; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31935
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
102 words
A method for optically recording information in an optical recording medium, which comprises the following steps: selecting an optical recording medium comprising an optical recording layer provided on a substrate, a protective material and a bond layer for bonding the optical recording layer to the protective material, the bond layer having a thermoplastic adhesive comprising (A) a tackifier and (B) at least one of (i) an ethylene-acrylic acid copolymer, (ii) an ethylene-acrylate ester copolymer and (iii) an ethylene-maleic anhydride-acrylic acid terpolymer; and irradiating said optical recording medium with a light beam, thereby forming pits in the optical recording layer and recording information.
Claim 2
Independent Claim
102 words
A method for optically recording information in an optical recording medium, which comprises the following steps: selecting an optical recording medium comprising an optical recording layer provided on a substrate, a protective material and a bond layer for bonding the optical recording layer to the protective material, the bond layer having a thermoplastic adhesive comprising (A) a tackifier and (B) at least one of (i) an ethylene-acrylic acid copolymer, (ii) an ethylene-acrylate ester copolymer and (iii) an ethylene-maleic anhydride-acrylic acid terpolymer; and irradiating said optical recording medium with a light beam, thereby forming pits in the optical recording layer and recording information.
Claim 3
Dependent Claim
26 words
A method for optically recording information according to claim 1, wherein the tackifier is at least one of terpene resin, terpene-phenol resin, and their hydrogenated resins.
Claim 4
Dependent Claim
21 words
A method for optically recording information according to claim 1, wherein the optical recording layer contains a polymethine-based organic coloring matter.
Claim 5
Dependent Claim
98 words
A method for optically recording information according to claim 3, wherein the polymethine-based organic coloring matter is a compound represented by the following general formula (I): ##STR4## wherein R 1 , R 2 , R 3 and R 4 each represent a hydrogen atom, an alkyl group, a substituted alkyl group, a cyclic alkyl group, an alkenyl group, an aralkyl group, a substituted aralkyl group, an aryl group, a substituted aryl group, a styryl group, a substituted styryl group, a heterocyclic group or a substituted heterocyclic group; n is 0, 1 or 2; and X⊖ represents an anion.
Claim 6
Dependent Claim
26 words
A method for optically recording information according to claim 3, wherein the polymethine-based, organic coloring matter is the compound represented by the following formula (II): ##STR5##
Claim 7
Dependent Claim
42 words
A method for optically recording information according to claim 1, wherein the thermoplastic adhesive contains from 60 to 90%, based on the total weight of said adhesive, of said component (B) and from 10 to 20% by weight of said component (A).
Claim 8
Dependent Claim
33 words
A method for optically recording information according to claim 6 wherein the thermoplastic adhesive consists essentially of a mixture of an ethylene-acrylic acid copolymer, an ethylene-maleic anhydride-acrylic acid terpolymer and a terpene resin.
Claim 9
Dependent Claim
29 words
A method for optically recording information according to claim 7 further comprising an optical recording layer containing the polymethine-based organic coloring matter represented by the following formula (II): ##STR6##
Claim 10
Dependent Claim
34 words
A method for optically recording information according to claim 6 wherein the thermoplastic adhesive consists essentially of a mixture of an ethylene-acrylic acid copolymer, an ethylene-maleic anhydride-acrylic acid terpolymer and a hydrogenated terpene resin.
Claim 11
Dependent Claim
29 words
A method for optically recording information according to claim 9 further comprising an optical recording layer containing the polymethine-based organic coloring matter represented by the following formula (III): ##STR7##
Claim 12
Dependent Claim
28 words
A method for optically recording information according to claim 6 wherein the thermoplastic adhesive consists essentially of a mixture of an ethylene-acrylic acid copolymer and a terpene resin.
Claim 13
Dependent Claim
32 words
A method for optically recording information according to claim 6 wherein the thermoplastic adhesive consists essentially of a mixture of an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer and a terpene-phenol resin.
Claim 14
Dependent Claim
28 words
A method for optically recording information according to claim 6 wherein the thermoplastic adhesive consists essentially of a mixture of an ethylene-ethyl acrylate copolymer and a terpene resin.
Claim 15
Independent Claim
35 words
A method for optically recording information according to any one of claims 11, 12 or 13 further comprising an optical recording layer containing the polymethine-based organic coloring matter represented by the following formula (II): ##STR8##
Claim 16
Dependent Claim
22 words
A method for optically recording information according to claim 1, wherein the bond layer has a thickness of 5 to 200 μm.
Claim 17
Dependent Claim
22 words
A method for optically recording information according to claim 1, wherein the bond layer has a thickness of 10 to 80 μm.
Claim 18
Dependent Claim
24 words
A method for optically recording information according to claim 1, wherein the optical recording layer has a thickness of 300 Å to 1500 Å.
Claim 19
Dependent Claim
24 words
A method for optically recording information according to claim 17, wherein the optical recording layer has a thickness of 700 Å to 1300 Å.
Claim 20
Dependent Claim
21 words
A method for optically recording information according to claim 1, wherein the optical recording medium is a card-type optical recording medium.
Claim 21
Dependent Claim
23 words
A method for optically recording information according to claim 1, wherein an underlayer is provided between the optical recording layer and the substrate.
Claim 22
Dependent Claim
22 words
A method for optically recording information according to claim 1, wherein said substrate of the optical recording medium is a polycarbonate substrate.
Claim 23
Dependent Claim
24 words
A method for optically recording information according to claim 1, wherein said protective material of the optical recording medium is a polycarbonate protective layer.
Claim 24
Dependent Claim
23 words
A method for optically recording information according to claim 1, wherein said substrate of the optical recording medium is a polymethyl methacrylate substrate.
Claim 25
Independent Claim
200 words
A method for optically recording information in an optical recording medium, which comprises the following steps: selecting an optical recording medium comprising an optical recording layer provided on a substrate, a protective material, and a bond layer for bonding the optical recording layer to the protective material, the bond layer having a thermoplastic adhesive comprising (A) a tackifier and (B) at least one of (i) an ethylene-acrylic acid copolymer, (ii) an ethylene-acrylate ester copolymer, and (iii) an ethylene-maleic anhydride-acrylic acid terpolymer, wherein said substrate is formed from polycarbonate resin and said optical recording layer contains a polymethine-based organic coloring matter represented by the following general formula (I): ##STR9## wherein R 1 , R 2 , R 3 and R 4 each represent a hydrogen atom, an alkyl group, a substituted alkyl group, a cyclic alkyl group, an alkenyl group, an aralkyl group, a substituted aralkyl group, an aryl group, a substituted aryl group, a styryl group, a substituted styryl group, a heterocyclic group or a substituted heterocyclic group; n is 0, 1 or 2; and X⊖ represents an anion; and irradiating said optical recording medium with a light beam, thereby forming pits in the optical recording layer and recording information.
Claim 26
Independent Claim
200 words
A method for optically recording information in an optical recording medium, which comprises the following steps: selecting an optical recording medium comprising an optical recording layer provided on a substrate, a protective material, and a bond layer for bonding the optical recording layer to the protective material, the bond layer having a thermoplastic adhesive comprising (A) a tackifier and (B) at least one of (i) an ethylene-acrylic acid copolymer, (ii) an ethylene-acrylate ester copolymer, and (iii) an ethylene-maleic anhydride-acrylic acid terpolymer, wherein said substrate is formed from polycarbonate resin and said optical recording layer contains a polymethine-based organic coloring matter represented by the following general formula (I): ##STR9## wherein R 1 , R 2 , R 3 and R 4 each represent a hydrogen atom, an alkyl group, a substituted alkyl group, a cyclic alkyl group, an alkenyl group, an aralkyl group, a substituted aralkyl group, an aryl group, a substituted aryl group, a styryl group, a substituted styryl group, a heterocyclic group or a substituted heterocyclic group; n is 0, 1 or 2; and X⊖ represents an anion; and irradiating said optical recording medium with a light beam, thereby forming pits in the optical recording layer and recording information.
References Cited (Backward Citations)
US4503531A
Cited
JPS6218290A
Cited
JPS637532A
Cited
US4897829A
Cited
US4904574A
Cited
US5085925A
Cited
US4956214A
Cited
JPH01209628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-22 | 1996-06-22 | 1996-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-22 | 2000-06-22 | 2000-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-22 | 2004-06-22 | 2004-12-22 | $7700.00 | Window Closed / Lapsed |