US4801392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording compositions containing ionic dye compounds as initiators
Assignee: Cycolor Imaging Inc
•
Filing: 1987-07-02
•
Granted: 1989-01-31
•
Expires: 2007-07-02
Abstract
Abstract The present invention provides magnetic recording compositions containing magnetic particles and a photohardenable composition wherein the photohardenable composition contains a free radical addition polymerizable or crosslinkable compound and an ionic dye-reactive counter ion compound. The ionic dye-reactive counter ion compound is capable of absorbing actinic radiation and producing free radicals within initiate free radical polymerization or crosslinking of the polymerizable or crosslinkable compound. The present invention also provides magnetic recording media incorporating the aforementioned magnetic recording compositions.
Inventors
- 👤 Paul C. Adair
- 👤 Todd M. Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/913
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A magnetic recording composition comprising magnetic particles and a photohardenable composition, said photohardenable composition comprising a free radical addition polymerizable or crosslinkable compound and an ionic dye-reactive counter ion compound, said ionic dye-reactive counter ion compound being a stable non-transient compound capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization or crosslinking of said polymerizable or crosslinkable compound.
Claim 2
Dependent Claim
63 words
A magnetic recording composition comprising magnetic particles and a photohardenable composition, said photohardenable composition comprising a free radical addition polymerizable or crosslinkable compound and an ionic dye-reactive counter ion compound, said ionic dye-reactive counter ion compound being a stable non-transient compound capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization or crosslinking of said polymerizable or crosslinkable compound.
Claim 3
Dependent Claim
15 words
The magnetic recording composition of claim 1 wherein said magnetic particles are magnetic iron oxide.
Claim 4
Dependent Claim
17 words
The magnetic recording composition of claim 2 wherein said magnetic particles comprise Fe 2 O 3 .
Claim 5
Dependent Claim
25 words
The magnetic recording composition of claim 3 wherein said ionic dye-reactive counter ion compound is soluble in said free radical addition polymerizable or crosslinked compound.
Claim 6
Dependent Claim
40 words
The magnetic recording composition of claim 3 wherein said ionic dye-reactive counter ion compound is characterized in that following exposure of said compound to light, said dye is excited to a singlet state which is quenched by said counter ion.
Claim 7
Dependent Claim
51 words
The magnetic recording composition of claim 5 wherein following exposure of said ionic dye-reactive counter ion compound to light, an electron is transferred from said dye to said counter ion or from counter ion to said dye and the rate of said electron transfer is greater than a diffusion controlled rate.
Claim 8
Dependent Claim
19 words
The magnetic recording composition of claim 3 wherein said ionic dye-reactive counter ion compound is an anionic dye compound.
Claim 9
Dependent Claim
22 words
The magnetic recording composition of claim 7 wherein said anionic dye is selected from the group consisting of xanthene and oxonol dyes.
Claim 10
Dependent Claim
18 words
The magnetic recording composition of claim 3 wherein said polymerizable or crosslinkable compound is an ethylenically unsaturated compound.
Claim 11
Dependent Claim
25 words
The magnetic recording composition of claim 7 said ionic dye-reactive counter ion compound is an anionic dye-iodonium ion complex or an anionic dye-pyryllium ion complex.
Claim 12
Dependent Claim
14 words
The magnetic recording composition of claim 10 wherein said dye is a xanthene dye.
References Cited (Backward Citations)
US3708296A
Cited
US3625744A
Cited
US3627656A
Cited
US3721616A
Cited
US4175973A
Cited
US4394403A
Cited
US4307182A
Cited
US4560617A
Cited
US4596747A
Cited
US4555449A
Cited
US4664964A
Cited
US4707431A
Cited
US4694029A
Cited
US4707432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |