US4135036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of magnetic recording media and recording media
Assignee: Adeka Corp
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Filing: 1976-12-29
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Granted: 1979-01-16
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Expires: 1996-12-29
Abstract
Abstract A process for producing a magnetic recording medium with a magnetic recording layer comprising coating a magnetic coating composition comprising mainly a ferromagnetic powder, a binder, and a predominantly aqueous coating solvent on a nonmagnetic support and then drying, wherein the binder contains a water-soluble or water-dispersible amide compound. In a particularly preferred embodiment, the binder also contains an epoxy compound containing on the average one or more adjacent epoxy groups in the molecule.
Inventors
- 👤 Yoshito Mukaida
- 👤 Yasuyuki Yamada
- 👤 Shinichi Hirayama
- 👤 Hiroshi Suzuki
- 👤 Yutaka Asakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31725
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
246 words
In a process for producing a magnetic recording medium with a magnetic recording layer comprising coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and a predominantly aqueous coating solvent on a non-magnetic support and drying, the improvement which comprises said binder contains a water-soluble of water-dispersible amide compound selected from the group consisting of (1) an amide compound obtained by reacting an aliphatic carboxylic acid and/or a derivative thereof with a polyamino compound; (2) an acryl-modified amide compound obtained by reacting said amide compound (1) with acrylic acid, methacrylic acid, and/or a derivative thereof; (3) an epoxy-modified amide compound obtained by reacting said amide compound (1) with an epoxy compound; (4) an acryl-epoxy-modified amide compound obtained by reacting said amide compound (1) with acrylic acid, methacrylic acid and/or a derivative thereof and and epoxy compound: (5) an amide compound obtained by reacting a maleic acid-modified unsaturated aliphatic carboxylic acid compound and a polyamino compound: (6) an epoxy-modified amide compound obtained by reacting said amide compound (5) with an epoxy compound: (7) an amide compound obtained by reacted a mixture of a maleic acid-modified unsaturated aliphatic carboxylic acid compound and an aliphatic carboxylic acid and/or a derivative thereof: and (8) an epoxy-modified amide compound obtained by reacting said amide compound (7) with an epoxy compound, wherein said water-soluble or water-dispersible amide compound is present in said binder in an amount of about 30% by weight or more based on total weight of the binder.
Claim 2
Dependent Claim
246 words
In a process for producing a magnetic recording medium with a magnetic recording layer comprising coating a magnetic coating composition comprising a ferromagnetic powder, a binder, and a predominantly aqueous coating solvent on a non-magnetic support and drying, the improvement which comprises said binder contains a water-soluble of water-dispersible amide compound selected from the group consisting of (1) an amide compound obtained by reacting an aliphatic carboxylic acid and/or a derivative thereof with a polyamino compound; (2) an acryl-modified amide compound obtained by reacting said amide compound (1) with acrylic acid, methacrylic acid, and/or a derivative thereof; (3) an epoxy-modified amide compound obtained by reacting said amide compound (1) with an epoxy compound; (4) an acryl-epoxy-modified amide compound obtained by reacting said amide compound (1) with acrylic acid, methacrylic acid and/or a derivative thereof and and epoxy compound: (5) an amide compound obtained by reacting a maleic acid-modified unsaturated aliphatic carboxylic acid compound and a polyamino compound: (6) an epoxy-modified amide compound obtained by reacting said amide compound (5) with an epoxy compound: (7) an amide compound obtained by reacted a mixture of a maleic acid-modified unsaturated aliphatic carboxylic acid compound and an aliphatic carboxylic acid and/or a derivative thereof: and (8) an epoxy-modified amide compound obtained by reacting said amide compound (7) with an epoxy compound, wherein said water-soluble or water-dispersible amide compound is present in said binder in an amount of about 30% by weight or more based on total weight of the binder.
Claim 3
Dependent Claim
28 words
The process as claimed in claim 1, wherein said binder further includes an epoxy compound containing on the average one or more adjacent epoxy groups in the molecule.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 2, wherein the weight ratio of said amide compound to said epoxy compound ranges from about 3:7 to 7:3.
Claim 5
Dependent Claim
11 words
A magnetic recording medium produced by the process of claim 3.
Claim 6
Dependent Claim
21 words
The process as claimed in claim 1, wherein said predominantly aqueous coating solvent contains at least about 50% by weight water.
Claim 7
Dependent Claim
15 words
The process as claimed in claim 1, wherein said predominantly aqueous coating solvent is water.
Claim 8
Dependent Claim
38 words
The process as claimed in claim 1 wherein said epoxy compound is selected from the group consisting of polyglycidyl ethers of polyhydric phenols or polyhydric phenol-alkylene oxides, per oxide oxidation type epoxy compounds and urethane modified epoxy compounds.
Claim 9
Dependent Claim
11 words
A magnetic recording medium produced by the process of claim 1.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said amide compound is prepared by condensing an aliphatic carboxylic acid with a polyamino compound.
Claim 11
Dependent Claim
20 words
The process of claim 9 wherein said amide compound is modified with acrylic acid, methacrylic acid or a derivative thereof.
Claim 12
Dependent Claim
15 words
The process of claim 10 wherein said amide compound is modified with an epoxy compound.
Claim 13
Dependent Claim
66 words
The process of claim 9 wherein said acid contains 10 to 20 carbon atoms and said polyamino compound is represented by the following formula (I) ##STR11## wherein R is a hydrogen atom or an alkyl group containing 5 or less carbon atoms and m is an integer of 6 or less; or by the formula (II) ##STR12## wherein n is an integer of 3 to 12.
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein said amide compound is modified with an epoxy compound.
Claim 15
Dependent Claim
23 words
The process of claim 9 wherein said binder further includes an epoxy compound containing on the average one or more adjacent epoxy groups.
Claim 16
Dependent Claim
25 words
The process of claim 1 wherein said amide compound is prepared by condensing a maleic acid modified unsaturated aliphatic carboxylic acid with a polyamino compound.
Claim 17
Dependent Claim
19 words
The process of claim 15 wherein said unsaturated aliphatic carboxylic acid has an iodide number less than 20 .
Claim 18
Dependent Claim
12 words
The process of claim 16 wherein said amide compound is epoxy modified.
Claim 19
Dependent Claim
22 words
The process of claim 1 wherein said amide compound is prepared by condensing an aliphatic carboxylic acid with a poly amino compound.
Claim 20
Dependent Claim
66 words
The process of claim 18 wherein said acid contains 10 to 20 carbon atoms and said poly amino compound is represented by the formula (I) ##STR13## wherein R is a hydrogen atom or an alkyl group containing 5 or less carbon atoms and m is an integer of 6 or less; or by the formula (II) ##STR14## wherein n is an integer of 3 to 12.
Claim 21
Dependent Claim
12 words
The process of claim 19 wherein said amide compound is epoxy modified.
Claim 22
Dependent Claim
23 words
The process of claim 18 wherein said binder further includes an epoxy compound containing on the average one or more adjacent epoxy groups.
Claim 23
Dependent Claim
26 words
The process of claim 1 wherein said amide compound is prepared by condensing a maleic acid modified unsaturated aliphatic carboxylic acid with a poly amino compound.
Claim 24
Dependent Claim
20 words
The process of claim 22 wherein said amide compound is modified with acrylic acid, methacrylic acid or a derivative thereof.
Claim 25
Dependent Claim
12 words
The process of claim 23 wherein said amide compound is epoxy modified.
Claim 26
Dependent Claim
12 words
The process of claim 24 wherein said amide compound is epoxy modified.
Claim 27
Dependent Claim
18 words
The process of claim 22 wherein said unsaturated aliphatic carboxylic acid has an iodide number less than 20.
References Cited (Backward Citations)
US3992478A
Cited
US3976822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |