Patent US4444850A successfully refreshed from Google Patents.
US4444850A
Expired / Lapsed
US
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Magnetic recording medium with titanate coupling agent
Assignee: Fujifilm Holdings Corp
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Filing: 1981-10-05
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Granted: 1984-04-24
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Expires: 2001-10-05
Abstract
Abstract A magnetic recording medium comprising a non-magnetic base and an overlying magnetic coating having ferromagnetic particles dispersed in a binder is disclosed. The magnetic coating is characterized by further containing a titanate coupling agent.
Inventors
- 👤 Akihiro Matsufuji
- 👤 Hideomi Watanabe
- 👤 Mashahi Aonuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A magnetic recording medium, comprising: a non-magnetic base; and an overlying magnetic coating on said base, said coating comprising ferromagnetic particles dispersed in a binder, wherein said coating further contains a mono- or bifunctional titanate coupling agent, and wherein said ferromagnetic particles are reacted with a non-sulfur-containing titanate coupling agent prior to incorporation of said particles in said binder.
Claim 2
Dependent Claim
59 words
A magnetic recording medium, comprising: a non-magnetic base; and an overlying magnetic coating on said base, said coating comprising ferromagnetic particles dispersed in a binder, wherein said coating further contains a mono- or bifunctional titanate coupling agent, and wherein said ferromagnetic particles are reacted with a non-sulfur-containing titanate coupling agent prior to incorporation of said particles in said binder.
Claim 3
Dependent Claim
29 words
A magnetic recording medium as claimed in claim 1, wherein said titanate coupling agent is present in an amount of from 0.01 to 10 wt% of the ferromagnetic particles.
Claim 4
Dependent Claim
25 words
A magnetic recording medium as claimed in claim 1, wherein said binder is a conventional thermoplastic resin, thermosetting resin, reactive resin, or a mixture thereof.
Claim 5
Dependent Claim
28 words
A magnetic recording medium as claimed in claim 1, wherein said ferromagnetic particles are ferromagnetic metal selected from the group consisting of Fe, Co, Ni and alloys thereof.
Claim 6
Dependent Claim
30 words
A magnetic recording medium as claimed in claim 1, wherein said non-magnetic base comprising a material selected from the group consisting of synthetic resins, non-magnetic metals, glass, ceramics, and paper.
Claim 7
Dependent Claim
88 words
A magnetic recording medium as claimed in claim 1, wherein said titanate coupling agent is selected from the group consisting of isopropyl triisostearoyltitanate, isopropyl trioctanoyltitanate, isopropyl diisostearoylcumylphenyltitanate, isopropyl distearoylmethacryltitanate, isopropyl dimethacrylisostearoyltitanate, isopropyl tridodecylbenzenesulfonyltitanate, isopropyl diisostearoylacryltitanate, isopropyl isostearoyldiacryltitanate, isopropyl tri(dioctylphosphate)titanate, isopropyl tri-n-stearoyltitanate, isopropyl 4-aminobenzenesulfonyl-di(dodecylbenzenesulfonyl)titanate, isopropyl trimethacrylonitrile, isopropyl tricumylphenyltitanate, isopropyl di(4-aminobenzoyl)isostearoyltitanate, isopropyl tri(dioctylpyrophosphate)titanate, isopropyl triacryltitanate, isopropyl tri(N,N-dimethyl-ethylamino)titanate, isopropyl tri(N-ethylaminoethylamino)titanate, isopropyl trianthranyltitanate, isopropyl tri(octylbutylpyrophosphate)titanate, isopropyl tri(butylmethylpyrophosphate)titanate, diisostearoyl oxyacetatetitanate, isostearoyl methacryloxyacetatetitanate, isostearoyl acryloxyacetatetitanate, di(dioctylphosphate)oxyacetatetitanate, 4-aminobenzenesulfonyldodecylbenzenesulfonyloxyacetatetitanate, dimethacryloxyacetatetitanate, dicumylphenolateoxyacetatetitanate, 4-aminobenzoylisostearoyloxyacetatetitanate, di(dioctylpyrophosphate)oxyacetatetitanate, diacryloxyacetatetitanate, di(octylbutylpyrophosphate)oxyacetatetitanate, diisostearoylethylenetitanate, isostearoylmethacrylethylenetitanate, di(dioctylphosphate)ethylenetitanate, 4-aminobenzenesulfonyldodecylbenzenesulfonylethylenetitanate, dimethacrylethylenetitanate, 4-aminobenzenesulfonylisostearoylethylenetitanate, di(dioctylpyrophosphate)ethylenetitanate, diacrylethylenetitanate, dianthranylethylenetitanate, and di(butylmethylpyrophosphate)ethylenetitanate.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |