US4369230A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1981-05-28
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Granted: 1983-01-18
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Expires: 2001-05-28
Abstract
Abstract A magnetic recording medium having a layer containing as a lubricant one or more organo-polysiloxane compounds having the following formula (I): <IMAGE> (wherein each of A1 and A2 is independently -CH3, -CH2-CH2-(CF2)q-CF3 or -R1OCOR2; R1 is a divalent hydrocarbon residue having 1 to 5 carbon atoms; R2 is a monovalent hydrocarbon residue having from 7 to 21 carbon atoms; each of l, m and n is independently O or an integer ranging from 1 to 200; and each of p and q is independently O or an integer ranging from 1 to 12; provided that when at least one of the groups A1 and A2 is the group -R1OCOR2, each l, m and n may be O and that, when each group A1 and A2 is one of the groups other than the group -R1OCOR2, each l and m may be O and n is an integer ranging from 1 to 200).
Inventors
- 👤 Shigeo Kimura
- 👤 Masashi Somezawa
- 👤 Kunio Kobayashi
- 👤 Minoru Takamizawa
- 👤 Yoshio Inoue
- 👤 Hiroshi Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/38; C08G77/382; C08G77/385; G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701; Y10T428/31504; Y10T428/3154; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
221 words
A magnetic recording medium comprising a non-magnetic base and a magnetic layer comprising magnetic particles in a binder, in which the non-magnetic base is provided with a layer containing at least one organo-polysiloxane compound represented by the formula (I): ##STR15## (wherein each of A 1 and A 2 is independently --CH 3 , --CH 2 --CH 2 --(CF 2 ) q --CF 3 or --R 1 OCOR 2 ; R 1 is a divalent hydrocarbon residue having 1 to 5 carbon atoms; R 2 is a monovalent hydrocarbon residue having from 7 to 21 carbon atoms; each of l, m and n is independently 0 or an integer ranging from 1 to 200; and each of p and q is independently 0 or an integer ranging from 1 to 12; provided that when at least one of A 1 and A 2 is the group --R 1 OCOR 2 , each of l, m and n may be 0 and that, when both A 1 and A 2 are groups other than the group --R 1 OCOR 2 , each of l and m may be 0 and n is an integer ranging from 1 to 200), said organopolysiloxane being contained in said magnetic layer, in a coating over said magnetic layer or on the opposite side from said magnetic layer.
Claim 2
Dependent Claim
221 words
A magnetic recording medium comprising a non-magnetic base and a magnetic layer comprising magnetic particles in a binder, in which the non-magnetic base is provided with a layer containing at least one organo-polysiloxane compound represented by the formula (I): ##STR15## (wherein each of A 1 and A 2 is independently --CH 3 , --CH 2 --CH 2 --(CF 2 ) q --CF 3 or --R 1 OCOR 2 ; R 1 is a divalent hydrocarbon residue having 1 to 5 carbon atoms; R 2 is a monovalent hydrocarbon residue having from 7 to 21 carbon atoms; each of l, m and n is independently 0 or an integer ranging from 1 to 200; and each of p and q is independently 0 or an integer ranging from 1 to 12; provided that when at least one of A 1 and A 2 is the group --R 1 OCOR 2 , each of l, m and n may be 0 and that, when both A 1 and A 2 are groups other than the group --R 1 OCOR 2 , each of l and m may be 0 and n is an integer ranging from 1 to 200), said organopolysiloxane being contained in said magnetic layer, in a coating over said magnetic layer or on the opposite side from said magnetic layer.
Claim 3
Dependent Claim
25 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is contained in a layer provided over the surface of the magnetic layer.
Claim 4
Dependent Claim
36 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is contained in a layer provided on a surface opposite to the surface of the non-magnetic base on which the magnetic layer is formed.
Claim 5
Dependent Claim
37 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is contained in a back coat provided on a surface opposite to the surface of the non-magnetic base on which the magnetic layer is formed.
Claim 6
Dependent Claim
25 words
A magnetic recording medium according to claim 4, wherein the organo-polysiloxane compound is contained in a layer provided on the surface of the back coat.
Claim 7
Dependent Claim
54 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 9 H 19 , l is 0, m is 8, n is 10, and p is 0.
Claim 8
Dependent Claim
43 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each --CH 2 OCOC 17 H 35 , l is 2, m is 2, n is 0, and p is 0.
Claim 9
Dependent Claim
51 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 9 H 19 , l is 8, m is 0, and n is 10.
Claim 10
Dependent Claim
54 words
A magnetic recording medium according to claim 1, wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 17 H 35 , l is 0, m is 8, n is 10, and p is 0.
Claim 11
Dependent Claim
54 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 9 H 19 , l is 30, m is 10, n is 18, and p is 3.
Claim 12
Dependent Claim
54 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 9 H 19 , l is 10, m is 8, n is 20, and p is 0.
Claim 13
Dependent Claim
54 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 13 H 27 , l is 10, m is 8, n is 20, and p is 0.
Claim 14
Dependent Claim
54 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 17 H 35 , l is 10, m is 8, n is 20, and p is 0.
Claim 15
Dependent Claim
54 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each methyl groups, the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 13 H 27 , l is 0, m is 8, n is 1, and p is 0.
Claim 16
Dependent Claim
61 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each --(CH 2 ) 3 OCOC 13 H 27 , the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 13 H 27 , l is 0, m is 3, n is 2, and p is 0.
Claim 17
Dependent Claim
56 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each --(CH 2 ) 2 CF 3 , the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 13 H 27 , l is 0, m is 0, and n is 1.
Claim 18
Dependent Claim
45 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each --(CH 2 ) 3 OCOC 13 H 27 , l is 0, m is 1, n is 0, and p is 0.
Claim 19
Dependent Claim
42 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are --CH 2 OCOC 13 H 27 , l is 0, m is 1, n is 0, and p is 0.
Claim 20
Dependent Claim
61 words
A magnetic recording medium according to claim 1 wherein the organo-polysiloxane compound is one in which A 1 and A 2 are each --(CH 2 ) 3 OCOC 13 H 27 , the group --R 1 OCOR 2 is --(CH 2 ) 3 OCOC 13 H 27 , l is 10, m is 8, n is 30, and p is 0.
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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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |