US4368242A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1981-08-24
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Granted: 1983-01-11
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Expires: 2001-08-24
Abstract
Abstract The magnetic recording medium according to the present invention contains the magnetic layer comprising the magnetic or magnetizable powders or particles and the binder wherein the binder compound is represented by the following general formula (I): <IMAGE> (wherein R is methyl group or ethyl group, R1 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms or a phenyl group, R2 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, X is a group having a double bond, and Y is a group having a double bond, i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, l is a number in the range of approximately 3 to 100, and m is a number in the range of approximately 1 to 50). The compound is cured by the irradiation of radiation so that the magnetic recording medium has an improved durability and a superior resistance to chemicals as well as a good magnetic characteristics.
Inventors
- 👤 Kaoru Nakajima
- 👤 Masashi Somezawa
- 👤 Minoru Takamizawa
- 👤 Yoshio Inoue
- 👤 Hiroshi Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/7026; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A magnetic recording medium having a magnetic layer comprising magnetic or magnetizable powders or particles, and a binder comprising at least one compound represented by the following general formula (I): ##STR18## (wherein R is a methyl or ethyl group, R 1 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms or a phenyl group, R 2 is an alkyl group having from 1 to 4 carbon atoms or an alkoxy group having from 1 to 4 carbon atoms, X is a group containing a double bond, Y is a group containing a double bond, i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, l is a number in the range of approximately 3 to 100, and m is a number in the range of approximately 1 to 50).
Claim 2
Dependent Claim
166 words
A magnetic recording medium having a magnetic layer comprising magnetic or magnetizable powders or particles, and a binder comprising at least one compound represented by the following general formula (I): ##STR18## (wherein R is a methyl or ethyl group, R 1 is an alkyl group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms or a phenyl group, R 2 is an alkyl group having from 1 to 4 carbon atoms or an alkoxy group having from 1 to 4 carbon atoms, X is a group containing a double bond, Y is a group containing a double bond, i is a number in the range of approximately 200 to 800, j is a number in the range of approximately 10 to 200, k is a number in the range up to approximately 200, l is a number in the range of approximately 3 to 100, and m is a number in the range of approximately 1 to 50).
Claim 3
Dependent Claim
64 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOC(CH 3 )═CH 2 , R 1 is ethoxy group, R 2 is butyl group, Y is --(CH 2 ) 3 NHCOCH═CH 2 , i is 630, j is 15, k is 48, l is 48, and m is 25.
Claim 4
Dependent Claim
60 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOC(CH 3 )═CH 2 , R 1 is methyl group, R 2 is methyl group, Y is --CH═CH 2 , i is 385, j is 9.3, k is 7.1, l is 21.4, and m is 7.1.
Claim 5
Dependent Claim
61 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOCH═CH 2 , R 1 is methyl group, R 2 is ethoxy group, Y is --(CH 2 ) 3 OCOC(CH 3 )═CH 2 , i is 385, j is 9.3, l is 28.6, and m is 7.1.
Claim 6
Dependent Claim
57 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOC(CH 3 )═CH 2 , R 1 is methyl group, R 2 is ethoxy group, Y is --CH═CH 2 , i is 385, j is 9.3, l is 28.6, and m is 7.1.
Claim 7
Dependent Claim
55 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOCH═CH 2 , R 1 is methyl group, R 2 is ethoxy group, Y is --CH═CH 2 , i is 385, j is 9.3, l is 28.6, and m is 7.1.
Claim 8
Dependent Claim
62 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOCH═CH 2 , R 1 is methyl group, R 2 is methyl group, Y is --(CH 2 ) 3 SCOCH═CH 2 , i is 385, j is 9.3, k is 10.7, l is 17.9, and m is 7.1.
Claim 9
Dependent Claim
64 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOC(CH 3 )═CH 2 , R 1 is butoxy group, R 2 is butoxy group, Y is --(CH 2 ) 3 OCOCH═CH 2 , i is 289, j is 5, k is 11.1, l is 33.9, and m is 11.7.
Claim 10
Dependent Claim
63 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOC(CH 3 )═CH 2 , R 1 is ethoxy group, R 2 is ethoxy group, Y is --(CH 2 ) 3 NHCOC(CH 3 )═CH 2 , i is 289, j is 5, l is 39, and m is 17.
Claim 11
Dependent Claim
55 words
A magnetic recording medium according to claim 1, wherein the compound is represented by Formula (I) in which R is methyl group, X is --OCOCH═CH 2 , R 1 is methyl group, R 2 is phenyl group, Y is --CH═CH 2 , i is 630, j is 15, l is 85, and m is 36.
Claim 12
Dependent Claim
25 words
A magnetic recording medium according to claim 1, wherein the compound is cured by irradiation in an amount ranging from approximately 1 to 10 Mrad.
Claim 13
Dependent Claim
20 words
A magnetic recording medium according to claim 11, wherein the strength of irradiation ranges from approximately 2 to 7 Mrad.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |