US4568612A
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Magnetic recording media
Assignee: Emtec Magnetics GmbH
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Filing: 1983-07-20
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Granted: 1986-02-04
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Expires: 2003-07-20
Abstract
Abstract Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer which consists of a dispersion of an anisotropic magnetic material in an organic binder which consists essentially of an OH-containing polyurea-urethane binder crosslinked with polyisocyanate. The OH-containing polyurea-urethane is obtained by reacting a polydiol, a diol and a primary or secondary aminoalcohol, and if appropriate a triol, with a diisocyanate.
Inventors
- 👤 August Lehner
- 👤 Werner Balz
- 👤 Werner Lenz
- 👤 Helmut Kopke
- 👤 Rudolf Bachmann
- 👤 Milan Velic
- 👤 Milena Melzer
- 👤 Heinrich Hartmann
- 👤 Reinhold Baur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
217 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists essentially of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the OH-containing polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained by reacting IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 10 moles of a diol of 2 to 18 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented finally crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 2
Dependent Claim
217 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists essentially of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the OH-containing polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained by reacting IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 10 moles of a diol of 2 to 18 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented finally crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 3
Dependent Claim
22 words
A magnetic recording medium as defined in claim 1, wherein the polyisocyanate-crosslinked polyurethane binder is the only binder in the magnetic layer.
Claim 4
Dependent Claim
26 words
A magnetic recording medium as defined in claim 1, wherein a portion of Component IB is replaced by a diamine of 2 to 15 carbon atoms.
Claim 5
Dependent Claim
29 words
A magnetic recording medium as defined in claim 1, wherein a portion of Component IB is replaced by a primary or secondary aminoalcohol of 2 to 20 carbon atoms.
Claim 6
Dependent Claim
19 words
A magnetic recording medium as defined in claim 1, wherein a portion of Component IB is replaced by water.
Claim 7
Dependent Claim
228 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists essentially of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of a diol of 2 to 18 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, ID. from 0.01 to 1 mole of a triol of 3 to 18 carbon atoms, and II. from 1.25 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to ID, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 8
Dependent Claim
228 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists essentially of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of a diol of 2 to 18 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, ID. from 0.01 to 1 mole of a triol of 3 to 18 carbon atoms, and II. from 1.25 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to ID, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 9
Dependent Claim
212 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of a diamine of 2 to 15 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 10
Dependent Claim
212 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of a diamine of 2 to 15 carbon atoms, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 11
Dependent Claim
198 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.3 to 13 moles of a primary or secondary amino-alcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 12
Dependent Claim
198 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.3 to 13 moles of a primary or secondary amino-alcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 13
Dependent Claim
206 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of water, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
Claim 14
Dependent Claim
206 words
A magnetic recording medium which comprises a magnetic layer which is applied to a non-magnetic base and consists of a dispersion of an anisotropic magnetic material in an organic binder consisting essentially of an OH-containing polyurethane compound which is finally crosslinked with a polyisocyanate, wherein the polyurethane compound is a thermoplastic polyurea-urethane which has an OH number of from 10 to 120 and a number average molecular weight of from 1,000 to 40,000 and is obtained from IA. 1 mole of a polydiol having a molecular weight of from 400 to 4,000, IB. from 0.2 to 9 moles of water, IC. from 0.1 to 4 moles of a primary or secondary aminoalcohol of 2 to 20 carbon atoms, and II. from 1.20 to 13 moles of a diisocyanate of 6 to 30 carbon atoms, the proportion of NCO groups in the diisocyanate being from 65 to 95%, based on Components IA to IC, of the equivalent amount of OH and NH groups, with the proviso that the non-pigmented crosslinked film has a tensile strength greater than 15 N/mm 2 , an elongation at break greater than 30%, a modulus of elasticity greater than 150 N/mm 2 and a pendulum hardness of from 25 to 140 sec.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |