US5079096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium comprising a substrate coated with a primer which is a protonic acid doped polyaniline polymer
Assignee: Nitto Denko Corp
•
Filing: 1990-03-13
•
Granted: 1992-01-07
•
Expires: 2010-03-13
Abstract
Abstract A magnetic recording medium comprising a non-magnetic substrate, a primer coating formed on the substrate and comprising an organic conducting polymer and a magnetic layer formed on the primer coating, which has good surface smoothness and low surface resistance.
Inventors
- 👤 Akira Miyake
- 👤 Tsugihiro Doi
- 👤 Minoru Ezoe
- 👤 Akira Ohtani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A magnetic recording medium comprising a non-magnetic substrate, a primer coating on said substrate and a magnetic layer on said primer coating, said primer coating being prepared by doping a polyaniline polymer with a protonic acid having a pKa value of 4.8 or less, which polymer comprises, in a undoped state, repeating units of the formula: ##STR6## wherein m and n are molar fractions of the quinonediimine repeating units and the phenylenediamine repeating units, respectively, and m is larger than 0 and smaller than 1, n is larger than 0 and smaller than 1, and the sum of m and n is 1, and provides a laser Raman spectrum recorded by exciting with a light having a wavelength of 457.9 nm in which a ratio of the Raman line strength (Ia) assigned to the ring stretching vibration appeared at a wave number range larger than 1,600 cm -1 to that (Ib) appeared at a wave number range smaller than 1,600 cm -1 (Ia/Ib) is at least 1.0.
Claim 2
Dependent Claim
167 words
A magnetic recording medium comprising a non-magnetic substrate, a primer coating on said substrate and a magnetic layer on said primer coating, said primer coating being prepared by doping a polyaniline polymer with a protonic acid having a pKa value of 4.8 or less, which polymer comprises, in a undoped state, repeating units of the formula: ##STR6## wherein m and n are molar fractions of the quinonediimine repeating units and the phenylenediamine repeating units, respectively, and m is larger than 0 and smaller than 1, n is larger than 0 and smaller than 1, and the sum of m and n is 1, and provides a laser Raman spectrum recorded by exciting with a light having a wavelength of 457.9 nm in which a ratio of the Raman line strength (Ia) assigned to the ring stretching vibration appeared at a wave number range larger than 1,600 cm -1 to that (Ib) appeared at a wave number range smaller than 1,600 cm -1 (Ia/Ib) is at least 1.0.
Claim 3
Dependent Claim
125 words
A magnetic recording medium comprising a non-magnetic substrate, a primer coating on said substrate consisting essentially of a conductive polyaniline polymer and a magnetic layer on said primer coating, said polyaniline polymer being prepared by doping said polymer with a protonic acid having a pKa value of 4.8 or less, which polymer comprises, in an undoped state, repeating units of the formula: ##STR7## wherein m and n are molar fractions of the quinonediimine repeating units and the phenylenediamine repeating units, respectively, and m is larger than 0 and smaller than 1, n is larger than 0 and smaller than 1, and the sum of m and n is 1, and has an intrinsic viscosity of at least 0.40 dl/g measured in N-methyl-2-pyrrolidone at 30° C.
Claim 4
Dependent Claim
125 words
A magnetic recording medium comprising a non-magnetic substrate, a primer coating on said substrate consisting essentially of a conductive polyaniline polymer and a magnetic layer on said primer coating, said polyaniline polymer being prepared by doping said polymer with a protonic acid having a pKa value of 4.8 or less, which polymer comprises, in an undoped state, repeating units of the formula: ##STR7## wherein m and n are molar fractions of the quinonediimine repeating units and the phenylenediamine repeating units, respectively, and m is larger than 0 and smaller than 1, n is larger than 0 and smaller than 1, and the sum of m and n is 1, and has an intrinsic viscosity of at least 0.40 dl/g measured in N-methyl-2-pyrrolidone at 30° C.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |