Patent US2006194A successfully refreshed from Google Patents.
US3987232A
Expired / Lapsed
US
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Magnetic recording materials having great resistance to wear and tear
Assignee: Eastman Kodak Co
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Filing: 1973-03-15
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Granted: 1976-10-19
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Expires: 1993-03-15
Abstract
Abstract A magnetic recording element having greatly improved resistance to wear and tear is disclosed. This element includes in a magnetizable layer a carbonic acid ester lubricant such as ethyl cetyl carbonate, ethyl lauryl carbonate, didodecyl carbonate or phenyl cetyl carbonate. The lubricant can be present in an amount between 1 and 40% by weight of the binder, and advantageously about 20%. A typical binder is a copolymer of vinyl chloride with vinyl acetate, with or without polyurethane.
Inventors
- 👤 Albert P. Huguenard
- 👤 Yves P. M. Etienne
- 👤 Charles A. R. Magallon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6212; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/109; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant having the formula: ##EQU1## where R 3 is phenyl and q is a whole number of at least 9, said ester containing at least 13 carbon atoms.
Claim 2
Dependent Claim
65 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant having the formula: ##EQU1## where R 3 is phenyl and q is a whole number of at least 9, said ester containing at least 13 carbon atoms.
Claim 3
Dependent Claim
60 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant having the formula: ##STR6## where R 1 is ethyl and R 2 is alkyl, said ester containing at least 13 carbon atoms.
Claim 4
Dependent Claim
60 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant having the formula: ##STR6## where R 1 is ethyl and R 2 is alkyl, said ester containing at least 13 carbon atoms.
Claim 5
Dependent Claim
56 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being ethyl cetyl carbonate, ethyl lauryl carbonate, dioctyl carbonate, didecyl carbonate or didodecyl carbonate.
Claim 6
Dependent Claim
56 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being ethyl cetyl carbonate, ethyl lauryl carbonate, dioctyl carbonate, didecyl carbonate or didodecyl carbonate.
Claim 7
Dependent Claim
23 words
An element according to claim 3 in which said binder comprises a partially hydrolized vinyl acetate vinyl chloride copolymer cross-linked with a poly-isocyanate.
Claim 8
Dependent Claim
46 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being phenyl cetyl carbonate.
Claim 9
Dependent Claim
46 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being phenyl cetyl carbonate.
Claim 10
Dependent Claim
46 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being ethyl cetyl carbonate.
Claim 11
Dependent Claim
46 words
A magnetic recording element comprising a non-magnetic support and a layer containing (1) magnetic particles dispersed in a binder and (2) about 1 to about 40 percent, by weight, based on binder, of a carbonic acid ester lubricant, said carbonic acid ester being ethyl cetyl carbonate.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |