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US4734330A
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US
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Magnetic recording medium
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1986-07-02
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Granted: 1988-03-29
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Expires: 2006-07-02
Abstract
Abstract Described is a magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon composed mainly of magnetic powder and a binder, said binder containing a compound represented by a following formula: <IMAGE> wherein X represents tertiary amine sulfonate or tertiary amine sulfuric ester, Y represents a monomer having vinyl group which is copolymerizable with vinyl chloride and i, j, k represent polymerization degrees.
Inventors
- 👤 Kiyokazu Oiyama
- 👤 Yoshinobu Ninomiya
- 👤 Hiroshi Yoshioka
- 👤 Ichiro Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon composed mainly of magnetic powder and a binder, said binder containing a compound represented by a following formula: ##STR21## wherein X represents tertiary amine sulfonate or tertiary amine sulfuric ester, Y represents a monomer having vinyl group which is copolymerizable with vinyl chloride and i, j, k represent polymerization degrees, i being in the range from 100 to 1000 and k being in the range from 0.1 to 100; and x having a polar group equivalent in the range from 1000 to 100,000.
Claim 2
Dependent Claim
97 words
A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon composed mainly of magnetic powder and a binder, said binder containing a compound represented by a following formula: ##STR21## wherein X represents tertiary amine sulfonate or tertiary amine sulfuric ester, Y represents a monomer having vinyl group which is copolymerizable with vinyl chloride and i, j, k represent polymerization degrees, i being in the range from 100 to 1000 and k being in the range from 0.1 to 100; and x having a polar group equivalent in the range from 1000 to 100,000.
Claim 3
Dependent Claim
38 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfuric ester of formula: ##STR22## wherein R 1 , R 2 and R 3 represent monovalent hydrocarbon groups with 1 to 6 carbon atoms.
Claim 4
Dependent Claim
19 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfuric ester of formula: ##STR23##
Claim 5
Dependent Claim
62 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfonate of formula: ##STR24## wherein R 1 , R 2 and R 3 represent monovalent hydrocarbon groups with 1 to 6 carbon atoms and R 4 represents a divalent organic group selected from the group consisting of --CH 2 --, --OCH 2 CH 2 CH 2 --, ##STR25##
Claim 6
Dependent Claim
37 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfonate of formula: ##STR26## wherein R 1 , R 2 and R 3 represent monovalent hydrocarbon groups with 1 to 6 carbon atoms.
Claim 7
Dependent Claim
18 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfonate of formula: ##STR27##
Claim 8
Dependent Claim
43 words
A magnetic recording medium according to claim 1, wherein X represents a tertiary amine sulfonate of formula: ##STR28## wherein R 4 represents a divalent organic group selected from the group consisting of --CH 2 --, --OCH 2 CH 2 CH 2 --, ##STR29##
Claim 9
Dependent Claim
43 words
A magnetic recording medium according to claim 1, wherein Y represents a monomer or monomers selected from the group consisting of vinyl acetate, vinyl alcohol, maleic acid, maleic anhydride, acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, acrylonitrile, vinylidene chloride and vinyl propionate.
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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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |