Patent US4788097A successfully refreshed from Google Patents.
US4788097A
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US
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Information recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1987-02-12
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Granted: 1988-11-29
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Expires: 2007-02-12
Abstract
Abstract An information recording medium including a substrate, an optional intermediate layer arranged on the substrate, and a recording layer arranged on the intermediate layer on the substrate, the recording layer including a low melting metal selected from the group consisting of In, Te, Sn, Pb and Bi and a metal compound selected from a metal sulfide, a metal fluoride and a metal oxide. The recording layer further contains a metal having a high surface tension of not less than 600 dyne/cm within temperatures from its melting point to a temperature higher than the melting point by 300° C., the concentrations of the metal varying along the depth direction of the recording layer in such manner that the concentration of the metal on the side facing the substrate is higher than that of the metal on the opposite side where the metal on the side facing the substrate may be in the form of islands. The intermediate layer includes a compound selected from the group consisting of a chlorinated polyolefin, a polymer material having a thermal decomposition temperature of not higher than 300° C., and an organic compound having a surface energy of not higher than 40 dyne/cm.sup. 2.
Inventors
- 👤 Shinichiro Ohara
- 👤 Masao Yabe
- 👤 Younosuke Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:09
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/252; G11B7/257; G11B2007/24302; G11B2007/24306; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B2007/24324; G11B2007/24326; G11B7/253; G11B7/2533; G11B7/2534; G11B7/2572; G11B7/2575; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
184 words
In an information recording medium comprising a substrate, an intermediate layer arranged on the substrate, and a recording layer arranged on the intermediate layer, said recording layer comprising a low melting metal selected from the group consisting of In, Te, Sn, Pb and Bi and a metal compound selected from a metal sulfide, a metal fluoride and a metal oxide, the improvement wherein: the recording layer further contains a metal having a high surface tension of not less than 600 dyne/cm within temperatures from its melting point to a temperature higher than the melting point by 300° C., the concentration of said metal varying along the depth direction of the recording layer in such manner that the concentration of said metal on the side facing the substrate is higher than that of said metal on the opposite side, and the intermediate layer comprises a compound selected from the group consisting of a chlorinated polyolefin, a polymer material having a thermal decomposition temperature of not higher than 300° C., and an organic compound having a surface energy of not higher than 40 dyne/cm 2 .
Claim 2
Dependent Claim
184 words
In an information recording medium comprising a substrate, an intermediate layer arranged on the substrate, and a recording layer arranged on the intermediate layer, said recording layer comprising a low melting metal selected from the group consisting of In, Te, Sn, Pb and Bi and a metal compound selected from a metal sulfide, a metal fluoride and a metal oxide, the improvement wherein: the recording layer further contains a metal having a high surface tension of not less than 600 dyne/cm within temperatures from its melting point to a temperature higher than the melting point by 300° C., the concentration of said metal varying along the depth direction of the recording layer in such manner that the concentration of said metal on the side facing the substrate is higher than that of said metal on the opposite side, and the intermediate layer comprises a compound selected from the group consisting of a chlorinated polyolefin, a polymer material having a thermal decomposition temperature of not higher than 300° C., and an organic compound having a surface energy of not higher than 40 dyne/cm 2 .
Claim 3
Dependent Claim
42 words
The information recording medium claimed in claim 1, wherein said metal having a high surface tension is selected from the group consisting of Ag, Al, Co, Cu, Ga, Mo, Ni, Si, V, Au, Be, Cr, Fe, Mn, Nb, Pd, Ti and Zn.
Claim 4
Dependent Claim
18 words
The information recording medium claimed in claim 1, wherein said metal having a high surface tension is Au.
Claim 5
Dependent Claim
38 words
The information recording medium claimed in claim 1, wherein said metal having a high surface tension is contained in the recording layer in an amount of 0.1 to 30 wt.% per the total amount of the recording layer.
Claim 6
Dependent Claim
37 words
The information recording medium claimed in claim 1, wherein the concentration of said metal having a high surface tension at the surface in contact with the intermediate layer is in the range of 10 to 70 wt.%.
Claim 7
Dependent Claim
19 words
The information recording medium claimed in claim 1, wherein the intermediate layer comprises chlorinated polyethylene, chlorinated polypropylene, and polystyrene.
Claim 8
Dependent Claim
24 words
The information recording medium claimed in claim 1, wherein said intermediate layer comprises a chlorinated polyolefin having a chlorination ratio of more than 30%.
Claim 9
Dependent Claim
106 words
In an information recording medium comprising a substrate and a recording layer arranged on the substrate, said recording layer comprising a low melting metal selected from the group consisting of In, Te, Sn, Pb and Bi and a metal compound selected from GeS, a metal fluoride and a metal oxide, the improvement wherein: the recording layer further contains a metal having a high surface tension of not less than 600 dyne/cm within temperatures from its melting point to a temperature higher than the melting point of 300° C., said high surface tension metal being arranged in the form of islands on the surface facing the substrate.
Claim 10
Dependent Claim
106 words
In an information recording medium comprising a substrate and a recording layer arranged on the substrate, said recording layer comprising a low melting metal selected from the group consisting of In, Te, Sn, Pb and Bi and a metal compound selected from GeS, a metal fluoride and a metal oxide, the improvement wherein: the recording layer further contains a metal having a high surface tension of not less than 600 dyne/cm within temperatures from its melting point to a temperature higher than the melting point of 300° C., said high surface tension metal being arranged in the form of islands on the surface facing the substrate.
Claim 11
Dependent Claim
22 words
The information recording medium as claimed in claim 8, wherein an intermediate layer is provided between the substrate and the recording layer.
Claim 12
Dependent Claim
63 words
The information recording medium as claimed in claim 8, wherein an intermediate layer comprises a compound selected from the group consisting of a chlorinated polyolefin, a polymer material having a thermal decomposition temperature of not higher than 300° C., and an organic compound having a surface energy of not higher than 40 dyne/cm 2 is provided between the substrate and the recording layer.
Claim 13
Dependent Claim
42 words
The information recording medium claimed in claim 8, wherein said metal having a high surface tension is selected from the group consisting of Ag, Al, Co, Cu, Ga, Mo, Ni, Si, V, Au, Be, Cr, Fe, Mn, Nb, Pd, Ti and Zn.
Claim 14
Dependent Claim
18 words
The information recording medium claimed in claim 8, wherein said metal having a high surface tension is Au.
Claim 15
Dependent Claim
38 words
The information recording medium claimed in claim 8, wherein said metal having a high surface tension is contained in the recording layer in an amount of 0.1 to 30 wt.% per the total amount of the recording layer.
Claim 16
Dependent Claim
45 words
The information recording medium claimed in claim 8, wherein said islands of the metal having a high surface tension are in the form of dots having a mean diameter of 20 to 500 angstroms and distances between adjoining dots ranges from 50 to 1,000 angstroms.
Claim 17
Dependent Claim
36 words
The information recording medium claimed in claim 8, wherein the intermediate layer comprising a polymer selected from the group consisting of chlorinated polyethylene, chlorinated polypropylene, and polystyrene is provided between the substrate and the recording layer.
Claim 18
Dependent Claim
33 words
The information recording medium claimed in claim 8, wherein the intermediate layer comprising a chlorinated polyolefin having a chlorination ratio of more than 30% is provided between the substrate and the recording layer.
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EP0045183A2
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |