US5085925A
Expired / Lapsed
US
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Optical recording medium
Assignee: Canon Inc
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Filing: 1990-10-16
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Granted: 1992-02-04
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Expires: 2010-10-16
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 Hiraoka
- 👤 Hiroyuki Imataki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:48
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: 13
Claim 1
Independent Claim
62 words
An optical recording medium which 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: (A) a tackifier and at least one of (B) an ethylene-acrylic acid copolymer, an ethylene-acrylate ester copolymer, or an ethylene-maleic anhydride-acrylic acid terpolymer.
Claim 2
Dependent Claim
62 words
An optical recording medium which 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: (A) a tackifier and at least one of (B) an ethylene-acrylic acid copolymer, an ethylene-acrylate ester copolymer, or an ethylene-maleic anhydride-acrylic acid terpolymer.
Claim 3
Dependent Claim
24 words
An optical recording medium according to claim 1, wherein the tackifier is at least one of terpene resin, terpene-phenol resin and their hydrogenated resin.
Claim 4
Dependent Claim
19 words
An optical recording medium according to claim 1, wherein the optical recording layer contains a polymethine-based organic coloring matter.
Claim 5
Dependent Claim
97 words
An optical recording medium according to claim 3, wherein the polymethine-based, organic coloring matter is a compound represented by the following general formula (I): ##STR4## where 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.sup.⊖ represents an anionic group.
Claim 6
Dependent Claim
24 words
An optical recording medium according to claim 3, wherein the polymethine-based, organic coloring matter is a compound represented by the following formula (II): ##STR5##
Claim 7
Dependent Claim
47 words
An optical recording medium according to claim 1, wherein the thermoplastic adhesive contains from 60 to 90% by weight of the total weight of said ethylene-acrylic acid and ethylene-acrylate ester copolymers, and said ethylene-maleic anhydride-acrylic acid terpolymer, and from 10 to 20% by weight of said tackifier.
Claim 8
Dependent Claim
20 words
An optical recording medium according to claim 1, wherein the bond layer has a thickness of 5 to 200 μm.
Claim 9
Dependent Claim
21 words
An optical recording medium according to claim 1, wherein the optical bond layer has a thickness of 10 to 80 μm.
Claim 10
Dependent Claim
22 words
An optical recording medium according to claim 1, wherein the optical recording layer has a thickness of 300 Å to 1500 Å.
Claim 11
Dependent Claim
22 words
An optical recording medium according to claim 9, wherein the optical recording layer has a thickness of 700 Å to 1300 Å.
Claim 12
Dependent Claim
19 words
An optical recording medium according to claim 1, wherein the optical recording medium is a card-type optical recording medium.
Claim 13
Dependent Claim
21 words
An optical recording medium according to claim 1, wherein an underlayer is provided between the optical recording layer and the substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |