US4600521A
Expired / Lapsed
US
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Electron-beam reactive magnetic coating composition for magnetic recording media
Assignee: Zeon Corp
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Filing: 1985-10-04
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Granted: 1986-07-15
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Expires: 2005-10-04
Abstract
Abstract An electron-beam reactive magnetic coating composition for use in magnetic recording media comprising a magnetic powder and a polymer resin as a binder therefor, the polymer resin containing vinyl chloride as a main component and having at least one hydrophilic group selected from the group of COOM, SO 3 M, SO 4 M, PO 3 M 2 and PO 4 M 2 (wherein M represents hydrogen, an alkali metal or ammonium) and not more than 10,000 double bond equivalents of an unsaturated acid ester group.
Inventors
- 👤 Eitaro Nakamura
- 👤 Kotaro Hata
- 👤 Makoto Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7026; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
An electron-beam reactive magnetic coating composition for use in magnetic recording media comprising a magnetic powder and a polymer resin as a binder therefor, the polymer resin containing vinyl chloride as a main component and having at least one hydrophilic group selected from the group of COOM, SO 3 M, SO 4 M, PO 3 M 2 and PO 4 M 2 (wherein M represents hydrogen, an alkali metal or ammonium) and not more than 10,000 double bond equivalents of an unsaturated acid ester group.
Claim 2
Dependent Claim
85 words
An electron-beam reactive magnetic coating composition for use in magnetic recording media comprising a magnetic powder and a polymer resin as a binder therefor, the polymer resin containing vinyl chloride as a main component and having at least one hydrophilic group selected from the group of COOM, SO 3 M, SO 4 M, PO 3 M 2 and PO 4 M 2 (wherein M represents hydrogen, an alkali metal or ammonium) and not more than 10,000 double bond equivalents of an unsaturated acid ester group.
Claim 3
Dependent Claim
20 words
The magnetic coating composition of claim 1 wherein the resin has an average degree of polymerization of 100 to 900.
Claim 4
Dependent Claim
19 words
The magnetic coating composition of claim 1 wherein the resin contains at least 60% by weight of vinyl chloride.
Claim 5
Dependent Claim
37 words
The magnetic coating composition of claim 1 wherein the resin contains 0.1 to 4.0% by weight of the hydrophilic group, as --COO, --SO 3 , --SO 4 , --PO 3 or --PO 4 group, per the resin.
Claim 6
Dependent Claim
58 words
The magnetic coating composition of claim 1 wherein the unsaturated acid ester group is derived from an unsaturated acid selected from a halogen-substituted (meth)acrylic acid, an unsaturated sulfonic acid, an unsaturated monoester of sulfuric acid, an unsaturated diester of phosphonic acid, maleic acid, citraconic acid, fumaric acid, mesaconic acid endomethylene-tetrahydrophthalic acid, methyl cyclohexene dicarboxylic acid and itaconic acid.
Claim 7
Dependent Claim
70 words
The magnetic coating composition of claim 1 wherein the resin is obtained by reacting a vinyl chloride polymer having at least one hydrophilic group selected from the group of COOM, SO 3 M, SO 4 M, PO 3 M 2 and PO 4 M 2 (wherein M represents hydrogen, an alkali metal or ammonium) and an epoxy group with an unsaturated acid having a pKa of not more than 3.5.
Claim 8
Dependent Claim
24 words
The magnetic coating composition of claim 6 wherein the content of the epoxy group is above 0.5% by weight per the vinyl chloride polymer.
Claim 9
Dependent Claim
54 words
The magnetic coating composition of claim 6 wherein the unsaturated acid is selected from the group of a halogen-substituted (meth)acrylic acid, an unsaturated sulfonic acid, an unsaturated monoester of sulfuric acid, an unsaturated diester of phosphoric acid, maleic acid, citraconic acid, fumaric acid, mesaconic acid, endomethylene-tetrahydrophthalic acid, methyl cyclohexene dicarboxylic acid and itaconic acid.
Claim 10
Dependent Claim
51 words
The magnetic coating composition of claim 1 wherein the resin is obtained by reacting an epoxy group-containing vinyl chloride polymer with (a) a polybasic unsaturated acid and/or (b-1) a monobasic unsaturated acid and (b-2) a polybasic saturated acid, the acids (a) and (b-1) having a pKa of not more than 3.5.
Claim 11
Dependent Claim
24 words
The magnetic coating composition of claim 9 wherein the content of the epoxy group is above 0.5% by weight per the vinyl chloride polymer.
Claim 12
Dependent Claim
36 words
The magnetic coating composition of claim 9 wherein the polybasic unsaturated acid (a) is selected from the group of maleic acid, citraconic acid, fumaric acid, mesaconic acid, endomethylene-tetrahydrophthalic acid, methyl cyclohexene dicarboxylic acid and itaconic acid.
Claim 13
Dependent Claim
40 words
The magnetic coating composition of claim 9 wherein the monobasic unsaturated acid (b-1) is selected from the group of a halogensubstituted (meth)acrylic acid, an unsaturated sulfonic acid, an unsaturated monoester of sulfuric acid and an unsaturated diester of phosphoric acid.
Claim 14
Dependent Claim
26 words
The magnetic coating composition of claim 9 wherein the polybasic saturated acid (b-2) is selected from the group of a polycarboxylic acid and a sulfocarboxylic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |