US4689181A
Expired / Lapsed
US
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Fluorine-containing organosilanes useful as magnetic media lubricants
Assignee: Dow Silicones Corp
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Filing: 1985-12-27
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Granted: 1987-08-25
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Expires: 2005-12-27
Abstract
Abstract The invention relates to new organosilanes represented by the following general formula: ##STR1## wherein R denotes a methyl, ethyl, propyl, or phenyl radical; R' denotes a monovalent hydrocarbon group having from 7 to 21 carbon atoms; R" denotes hydrogen or a methyl radical; R"' is selected from the class consisting of monovalent hydrocarbon groups having from 8 to 22 carbon atoms and acyl groups having from 8 to 22 carbon atoms; p has the value of 0, 1 or 2; m has the value of 1, 2, or 3; m+p has the value of 2 or 3; y has an average value from 1 to 20; n is a positive integer from 1 to 7; and q is a positive integer from 1 to 5. The use of the organosilanes as lubricants for magnetic recording media is described.
Inventors
- 👤 Pamela E. Blatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/68; G11B5/70; G11B5/71; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1896; C10; C10M; C10M105/00; C10M105/76; C10M2227/00; C10M2227/04; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/175; C10N2040/18; C10N2040/185; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
An organosilane represented by the general formula, ##STR7## wherein R denotes a methyl, ethyl, propyl, or phenyl radical; R' denotes a monovalent hydrocarbon group having from 7 to 21 carbon atoms; R" denotes hydrogen or a methyl radical; R"' is selected from the class consisting of monovalent hydrocarbon groups having from 8 to 22 carbon atoms and acyl groups from fatty acids having from 8 to 22 carbon atoms; p has the value of 0, 1 or 2; m has the value of 1, 2, or 3; m+p has the value of 2 or 3; y has an average value from 1 to 20; n is a positive integer from 1 to 7; and q is a positive integer from 1 to 5.
Claim 2
Dependent Claim
123 words
An organosilane represented by the general formula, ##STR7## wherein R denotes a methyl, ethyl, propyl, or phenyl radical; R' denotes a monovalent hydrocarbon group having from 7 to 21 carbon atoms; R" denotes hydrogen or a methyl radical; R"' is selected from the class consisting of monovalent hydrocarbon groups having from 8 to 22 carbon atoms and acyl groups from fatty acids having from 8 to 22 carbon atoms; p has the value of 0, 1 or 2; m has the value of 1, 2, or 3; m+p has the value of 2 or 3; y has an average value from 1 to 20; n is a positive integer from 1 to 7; and q is a positive integer from 1 to 5.
Claim 3
Dependent Claim
30 words
The organosilane according to claim 1 wherein the monovalent hydrocarbon groups represented by the symbols R' and R'" are selected from the class consisting of alkyl groups and alkenyl groups.
Claim 4
Dependent Claim
17 words
The organosilane according to claim 2 wherein R denotes methyl, p is 1, and m is 1.
Claim 5
Dependent Claim
23 words
The organosilane according to claim 3 wherein R" is hydrogen, y has an average value of 10 to 20, and q is 1.
Claim 6
Dependent Claim
27 words
The organosilane according to claim 4 wherein R' is tridecyl and R'" is a mixture of saturated and unsaturated acyl groups having 16 or 18 carbon atoms.
Claim 7
Dependent Claim
165 words
In a magnetic recording medium having a non-magnetic base and a magnetic layer formed thereon containing magnetizable particles dispersed in a resinous binder, the improvement comprising the magnetic layer having an organosilane represented by the formula ##STR8## wherein R denotes a methyl, ethyl, propyl, or phenyl radical; R' denotes a monovalent hydrocarbon group having from 7 to 21 carbon atoms; R" denotes hydrogen or a methyl radical; R"' is selected from the class consisting of monovalent hydrocarbon groups having from 8 to 22 carbon atoms and acyl groups having from 8 to 22 carbon atoms; p has the value of 0, 1 or 2; m has the value of 1, 2, or 3; m+p has the value of 2 or 3; y has an average value from 1 to 20; n is a positive integer from 1 to 7; and q is a positive integer from 1 to 5, the organosilane being present in an amount sufficient to provide lubricating properties to the magnetic layer.
Claim 8
Dependent Claim
165 words
In a magnetic recording medium having a non-magnetic base and a magnetic layer formed thereon containing magnetizable particles dispersed in a resinous binder, the improvement comprising the magnetic layer having an organosilane represented by the formula ##STR8## wherein R denotes a methyl, ethyl, propyl, or phenyl radical; R' denotes a monovalent hydrocarbon group having from 7 to 21 carbon atoms; R" denotes hydrogen or a methyl radical; R"' is selected from the class consisting of monovalent hydrocarbon groups having from 8 to 22 carbon atoms and acyl groups having from 8 to 22 carbon atoms; p has the value of 0, 1 or 2; m has the value of 1, 2, or 3; m+p has the value of 2 or 3; y has an average value from 1 to 20; n is a positive integer from 1 to 7; and q is a positive integer from 1 to 5, the organosilane being present in an amount sufficient to provide lubricating properties to the magnetic layer.
Claim 9
Dependent Claim
32 words
The magnetic recording medium according to claim 6 wherein the monovalent hydrocarbon groups represented by the symbols R' and R'" are selected from the class consisting of alkyl groups and alkenyl groups
Claim 10
Dependent Claim
19 words
The magnetic recording medium according to claim 7 wherein R denotes methyl, p is 1, and m is 1.
Claim 11
Dependent Claim
25 words
The magnetic recording medium according to claim 8 wherein R" is hydrogen, y has an average value of 10 to 20, and q is 1.
Claim 12
Dependent Claim
29 words
The magnetic recording medium according to claim 9 wherein R' is tridecyl and R'" is a mixture of saturated and unsaturated acyl radicals having 16 or 18 carbon atoms.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |