US4664734A
Expired / Lapsed
US
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Process for producing a magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1986-01-29
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Granted: 1987-05-12
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Expires: 2006-01-29
Abstract
Abstract A process for producing a magnetic recording medium is disclosed. The process comprises coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and an organic solvent on either a non-magnetic support or a roller or band having a mirror surface to form a magnetic layer on the non-magnetic support or the roller or band, respectively, drying the magnetic layer so as to have a solvent content of from 0.05 to 10% by weight, contacting the magnetic layer on the support or the roller or band with a roller or band having a mirror surface or a non-magnetic support, respectively, and separating the magnetic layer from the roller or band. The resulting magnetic recording medium has smooth surface, high electromagnetic properties, and good durability.
Inventors
- 👤 Tsutomu Okita
- 👤 Sugihiko Tada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/842
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
84 words
A process for producing a magnetic recording medium, which comprises coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and an organic solvent on a non-magnetic support to form a magnetic layer, drying the magnetic layer so as to have a solvent content of from 0.05 to 10% by weight based on the total weight of the magnetic layer, contacting the magnetic layer with a roller or band having a mirror surface, and peeling the magnetic layer from the roller or band.
Claim 2
Dependent Claim
84 words
A process for producing a magnetic recording medium, which comprises coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and an organic solvent on a non-magnetic support to form a magnetic layer, drying the magnetic layer so as to have a solvent content of from 0.05 to 10% by weight based on the total weight of the magnetic layer, contacting the magnetic layer with a roller or band having a mirror surface, and peeling the magnetic layer from the roller or band.
Claim 3
Dependent Claim
33 words
A process as in claim 1, wherein said binder is a radiation-polymerizable compound and the magnetic layer is irradiated with radiation while being interposed between the roller or band and the non-magnetic support.
Claim 4
Dependent Claim
29 words
A process as in claim 1, wherein said binder is a radiation-polymerizable compound and the magnetic layer is irradiated with radiation after being peeled from the roller or band.
Claim 5
Dependent Claim
35 words
A process as in claim 2, wherein said binder is a three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane acrylate, and (3) a polyfunctional acrylate compound.
Claim 6
Dependent Claim
35 words
A process as in claim 3, wherein said binder is a three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane acrylate, and (3) a polyfunctional acrylate compound.
Claim 7
Dependent Claim
54 words
A process as in claim 4, wherein the weight ratio of cellulose resin or vinyl chloride-vinyl acetate type copolymer to urethane acrylate is from 4/1 to 1/2, and the weight ratio of the sum of cellulose resin or vinyl chloride-vinyl acetate type copolymer and urethane acrylate to polyfunctional acrylate is from 4/1 to 1.1.
Claim 8
Dependent Claim
54 words
A process as in claim 5, wherein the weight ratio of cellulose resin or vinyl chloride-vinyl acetate type copolymer to urethane acrylate is from 4/1 to 1/2, and the weight ratio of the sum of cellulose resin or vinyl chloride-vinyl acetate type copolymer and urethane acrylate to polyfuntioncal acrylate is from 4/1 to 1/1.
Claim 9
Dependent Claim
32 words
A process as in claim 1, wherein said binder is three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane resin, and (3) a polyisocyanate.
Claim 10
Dependent Claim
38 words
A process as in claim 8, wherein the magnetic layer is heated to a temperature of from 40 to 100° C. for curing after the magnetic layer is separated from the roller or band having a mirror surface.
Claim 11
Dependent Claim
88 words
A process for producing a magnetic recording medium, which comprises coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and an organic solvent on a roller or band having a mirror surface to form a magnetic layer, drying the magnetic layer so as to have a solvent content of from 0.05 to 10% by weight based on the total weight of the magnetic layer, contacting the magnetic layer with a non-magnetic support, and transferring the magentic layer from the roller or band to the non-magnetic support.
Claim 12
Dependent Claim
88 words
A process for producing a magnetic recording medium, which comprises coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and an organic solvent on a roller or band having a mirror surface to form a magnetic layer, drying the magnetic layer so as to have a solvent content of from 0.05 to 10% by weight based on the total weight of the magnetic layer, contacting the magnetic layer with a non-magnetic support, and transferring the magentic layer from the roller or band to the non-magnetic support.
Claim 13
Dependent Claim
33 words
A process as in claim 10, wherein said binder is a radiation-polymerizable compound and the magnetic layer is irradiated with radiation while being interposed between the roller or band and the non-magnetic support.
Claim 14
Dependent Claim
33 words
A process as in claim 10, wherein said binder is a radiation-polymerizable compound and the magnetic layer is irradiated with radiation after being transferred from the roller or band to the non-magnetic support.
Claim 15
Dependent Claim
35 words
A process as in claim 11, wherein said binder is a three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane acrylate, and (3) a polyfunctional acrylate compound.
Claim 16
Dependent Claim
35 words
A process as in claim 12, wherein said binder is a three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane acrylate, and (3) a polyfunctional acrylate compound.
Claim 17
Dependent Claim
54 words
A process as in claim 13, wherein the weight ratio of cellulose resin or vinyl chloride-vinyl acetate type copolymer to urethane acrylate is from 4/1 to 1/2, and the weight ratio of the sum of cellulose resin or vinyl chloride-vinyl acetate type copolymer and urethane acrylate to polyfuntioncal acrylate is from 4/1 to 1/1.
Claim 18
Dependent Claim
54 words
A process as in claim 14, wherein the weight ratio of cellulose resin or vinyl chloride-vinyl acetate type copolymer to urethane acrylate is from 4/1 to 1/2, and the weight ratio of the sum of cellulose resin or vinyl chloride-vinyl acetate type copolymer and urethane acrylate to polyfuntioncal acrylate is from 4/1 to 1/1.
Claim 19
Dependent Claim
33 words
A process as in claim 10, wherein said binder is a three-component system comprising (1) a vinyl chloride-vinyl acetate type copolymer or a cellulose resin, (2) a urethane resin, and (3) a polyisocyanate.
Claim 20
Dependent Claim
38 words
A process as in claim 17, wherein the magnetic layer is heated to a temperature of from 40° to 100° C. for curing after the magnetic layer is separated from the roller or band having a mirror surface.
Claim 21
Dependent Claim
25 words
A process as in claim 1, wherein the weight ratio of ferromagnetic powder to binder in the magnetic coating composition is from 2/1 to 6/1.
Claim 22
Dependent Claim
25 words
A process as in claim 10, wherein the weight ratio of ferromagnetic powder to binder in the magnetic coating composition is from 2/1 to 6/1.
Claim 23
Dependent Claim
25 words
A process as in claim 1, wherein the weight ratio of organic solvent to binder in the magnetic coating composition is from 6/1 to 15/1.
Claim 24
Dependent Claim
25 words
A process as in claim 10, wherein the weight ratio of organic solvent to binder in the magnetic coating composition is from 6/1 to 15/1.
Claim 25
Dependent Claim
26 words
A process as in claim 1, wherein the magnetic layer is dried so as to have a solvent content of from 0.5 to 8% by weight.
Claim 26
Dependent Claim
26 words
A process as in claim 1, wherein the magnetic layer is dried so as to have a solvent content of from 1.5 to 5% by weight.
Claim 27
Dependent Claim
26 words
A process as in claim 10, wherein the magnetic layer is dried so as to have a solvent content of from 0.5 to 8% by weight.
Claim 28
Dependent Claim
26 words
A process as in claim 10, wherein the magnetic layer is dried so as to have a solvent content of from 1.5 to 5% by weight.
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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |