Patent US3286645A successfully refreshed from Google Patents.
Patent US4526836A successfully refreshed from Google Patents.
US4526836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media comprising a reaction product of a specific type of fluorine resin and a curing polymer material as a binder in the magnetic layer thereof
Assignee: Victor Company of Japan Ltd
•
Filing: 1984-09-13
•
Granted: 1985-07-02
•
Expires: 2004-09-13
Abstract
Abstract Magnetic recording media which comprise a non-magnetic support and a magnetic layer formed on at least one side thereof, in which the magnetic layer is made of a magnetic composition which comprises magnetic particles dispersed throughout a resin binder consisting essentially of a reaction product of a fluorine resin having at least two hydroxyl groups in one molecule of the resin and a curing polymer material having functional groups capable of reaction with the fluorine resin through the at least two hydroxyl groups.
Inventors
- 👤 Yasuo Mukai
- 👤 Yosuke Takazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
A magnetic recording medium which comprises a non-magnetic support and a magnetic layer formed on at least one side of said support, said magnetic layer being made of a magnetic composition which comprises magnetic particles dispersed throughout a binder of a reaction product between a fluorine resin having at least two hydroxyl groups in one molecule of said resin and being soluble in an organic solvent and a polymer material having functional groups capable of condensation reaction with said fluorine resin through the at least two hydroxyl groups.
Claim 2
Dependent Claim
88 words
A magnetic recording medium which comprises a non-magnetic support and a magnetic layer formed on at least one side of said support, said magnetic layer being made of a magnetic composition which comprises magnetic particles dispersed throughout a binder of a reaction product between a fluorine resin having at least two hydroxyl groups in one molecule of said resin and being soluble in an organic solvent and a polymer material having functional groups capable of condensation reaction with said fluorine resin through the at least two hydroxyl groups.
Claim 3
Dependent Claim
27 words
The magnetic recording medium according to claim 1, wherein said magnetic particles are contained in an amount of from 20 to 80 wt% of said magnetic composition.
Claim 4
Dependent Claim
28 words
The magnetic recording medium according to claim 1, wherein said reaction product comprises 10 to 98 wt% of said fluorine resin and the balance of said polymer material.
Claim 5
Dependent Claim
24 words
The magnetic recording medium according to claim 3, wherein the content of said fluorine resin in said binder is from 30 to 90 wt%.
Claim 6
Dependent Claim
49 words
The magnetic recording medium according to claim 1, said fluorine resin is a copolymer of 40 to 60 mole% of a fluoroolefin, 5 to 45 mole% of cyclohexyl vinyl ether, 5 to 45 mole% of an alkyl vinyl ether and 3 to 15 mole% of a hydroxyalkyl vinyl ether.
Claim 7
Dependent Claim
17 words
The magnetic recording medium according to claim 5, wherein said fluoroolefin is trifluoroethylene, chlorotrifluoroethylene, tetrafluoroethylene or hexafluoropropylene.
Claim 8
Dependent Claim
24 words
The magnetic recording medium according to claim 5, wherein said alkyl vinyl ether has an alkyl group having from 2 to 8 carbon atoms.
Claim 9
Dependent Claim
24 words
The magnetic recording medium according to claim 5, wherein said hydroxyalkyl vinyl ether has an alkyl group having from 2 to 8 carbon atoms.
Claim 10
Dependent Claim
37 words
The magnetic recording medium according to claim 5, wherein said fluorine resin further comprises up to 30 mole% a copolymerizable monomer having a functional group selected from the group consisting of --COOH group, --NH 2 group, ##STR4##
Claim 11
Dependent Claim
21 words
The magnetic recording medium according to claim 1, wherein said fluorine resin has a molecular weight of from 2000 to 100,000.
Claim 12
Dependent Claim
23 words
The magnetic recording medium according to claim 1, wherein said medium is a magnetic disc having the magnetic layer on opposite sides thereof.
Claim 13
Dependent Claim
23 words
The magnetic recording medium according to claim 1, wherein said medium is a magnetic tape having the magnetic layer on one side thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |