US4687710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1986-08-18
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Granted: 1987-08-18
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Expires: 2006-08-18
Abstract
Abstract A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said nonmagnetic support has heat shrinkage ratio of not higher than 1.0% at 110° C. for 4 hours and said magnetic recording layer comprises at least one fatty acid and at least one modified silicon compound.
Inventors
- 👤 Hiroshi Ogawa
- 👤 Shinji Saito
- 👤 Chiaki Mizuno
- 👤 Yasuo Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/73; G11B5/7368; G11B5/739; G11B5/73911; G11B5/73917; G11B5/73919; G11B5/73923; G11B5/73927; G11B5/73929; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
A magnetic recording medium comprising a non-magnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said nonmagnetic support has heat shrinkage ratio of not higher than 1.0% at 110° C. for 4 hours under application of no tension and said magnetic recording layer comprises at least one fatty acid having 12 to 22 carbon atoms and at least one modified silicon compound having a molecular weight of not less than 200, wherein the total amount of said fatty acid and said modified silicon compound in the magnetic recording layer is in the range of 0.5 to 10 parts by weight per 100 parts by weight of the ferromagnetic powder and wherein said magnetic recording layer contains the fatty acid and the modified silicon compound in a weight ratio of 9/1 to 1/9.
Claim 2
Dependent Claim
151 words
A magnetic recording medium comprising a non-magnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said nonmagnetic support has heat shrinkage ratio of not higher than 1.0% at 110° C. for 4 hours under application of no tension and said magnetic recording layer comprises at least one fatty acid having 12 to 22 carbon atoms and at least one modified silicon compound having a molecular weight of not less than 200, wherein the total amount of said fatty acid and said modified silicon compound in the magnetic recording layer is in the range of 0.5 to 10 parts by weight per 100 parts by weight of the ferromagnetic powder and wherein said magnetic recording layer contains the fatty acid and the modified silicon compound in a weight ratio of 9/1 to 1/9.
Claim 3
Dependent Claim
20 words
The magnetic recording medium as claimed in claim 1 in which said modified silicon compound is of the formula ##STR23##
Claim 4
Dependent Claim
23 words
The magnetic recording medium as claimed in claim 1, wherein said modified silicon compound has a molecular weight of not less than 1,000.
Claim 5
Dependent Claim
25 words
The magnetic recording medium as claimed in claim 1, wherein said modified silicon compound has a molecular weight in the range of 5,000 to 100,000.
Claim 6
Dependent Claim
20 words
The magnetic recording medium as claimed in claim 1, wherein said modified silicon compound is a fatty acid-modified silicon compound.
Claim 7
Dependent Claim
30 words
The magnetic recording medium as claimed in claim 5, wherein said fatty acid-modified silicon compound is a silicon compound modified with a fatty acid having 12 to 22 carbon atoms.
Claim 8
Dependent Claim
31 words
The magnetic recording medium as claimed in claim 1, wherein said magnetic recording layer contains the fatty acid and the modified silicon compound in a weight ratio of 7/3 to 3/7.
Claim 9
Dependent Claim
48 words
The magnetic recording medium as claimed in claim 7 in which the total amount of said fatty acid and said modified silicon compound in the magnetic recording layer is in the range of 1 to 5 parts by weight per 100 parts by weight of the ferromagnetic powder.
Claim 10
Dependent Claim
24 words
The magnetic recording medium as claimed in claim 1 in which said non-magnetic support has a heat shrinkage ratio of not higher than 0.7%.
Claim 11
Dependent Claim
27 words
The magnetic recording medium as claimed in claim 1 in which said fatty acid is selected from the group consisting of lauric, myristic, stearic and oleic acids.
Claim 12
Dependent Claim
26 words
The magnetic recording medium as claimed in claim 10 in which said modified silicon compound is of the formula ##STR24## wherein n is 1 or 11.
Claim 13
Dependent Claim
114 words
The magnetic recording medium as claimed in claim 10 in which said modified silicon compound is of the formula ##STR25## in which R, R 1 and R 2 are a hydrocarbon of 7 to 21 carbon atoms, R 3 , R 4 , R 5 and R 6 are a hydrocarbon of 1 to 21 carbon atoms, m is an integer of 1 to 100, n is an integer of 0 to 250, m+n is less than or equal to 300 and m is greater than or equal to n/5; and x, y and z have the relationship of 1≦z<150, 0≦y, y+z≦1,000, 1≦x<y+z, and z/y=1/1000-1/1; and b is an integer from 0 to 1,000.
Claim 14
Dependent Claim
50 words
The magnetic recording medium as claimed in claim 12 in which said modified silicon compound is of the formula ##STR26## wherein m and n are respectively 1 and 1, 10 and 20 or 100 and 200, and wherein z and y are respectively 1 and 1 or 25 and 75.
Claim 15
Dependent Claim
20 words
The magnetic recording medium as claimed in claim 12 in which said modified silicon compound is of the formula ##STR27##
References Cited (Backward Citations)
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |