US4770952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media dispersants
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1987-07-10
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Granted: 1988-09-13
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Expires: 2007-07-10
Abstract
Abstract Reactive dispersants for magnetic recording media are prepared by sequentially phosphating and esterifying or esterifying and phosphating alkoxylated alcohols having at least two carbon atoms and at least two hydroxyl groups. The phosphating agent can be phosphorus oxychloride while the esterifying agent can be acrylic acid.
Inventors
- 👤 John G. Papalos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
202 words
A magnetic recording medium comprising a non-magnetic support having a coating thereon containing finely divided magnetic particles, said coating containing, as a dispersant for said magnetic particles, a triphosphate acrylate ester of a condensate of one mole of at least one alcohol having at least two carbon atoms and a least two hydroxyl groups with from about one to about ten moles of at least one alkylene oxide having from two to four carbon atoms per hydroxyl group of said alcohol, said condensate esterified so that from about 20% to about 80% of hydroxyl groups of said condensate are esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride, the balance of said hydroxyl groups esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, or from about 20% to about 80% of hydroxyl groups of said condensate esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, the balance of said hydroxyl groups esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride which has been cured.
Claim 2
Dependent Claim
202 words
A magnetic recording medium comprising a non-magnetic support having a coating thereon containing finely divided magnetic particles, said coating containing, as a dispersant for said magnetic particles, a triphosphate acrylate ester of a condensate of one mole of at least one alcohol having at least two carbon atoms and a least two hydroxyl groups with from about one to about ten moles of at least one alkylene oxide having from two to four carbon atoms per hydroxyl group of said alcohol, said condensate esterified so that from about 20% to about 80% of hydroxyl groups of said condensate are esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride, the balance of said hydroxyl groups esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, or from about 20% to about 80% of hydroxyl groups of said condensate esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, the balance of said hydroxyl groups esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride which has been cured.
Claim 3
Dependent Claim
29 words
The magnetic recording medium of claim 1 wherein the ultraviolet or electron beam curable anionic vinyl monomer is selected from the group consisting of acrylic acid and methacrylic acid.
Claim 4
Dependent Claim
34 words
The magnetic recording medium of claim 1 wherein in said dispersant the alcohol is neopentylglycol, the alkylene oxide is ethylene oxide and the ultraviolet or electron beam curable anionic vinyl monomer is acrylic acid.
Claim 5
Dependent Claim
34 words
The magnetic recording medium of claim 1 wherein in said dispersant the alcohol is neopentylglycol, the alkylene oxide is ethylene oxide and the ultraviolet or electron beam curable anionic vinyl monomer is methacrylic acid.
Claim 6
Dependent Claim
192 words
A coating composition containing finely divided magnetic particles in a resin and as a dispersant for said magnetic particles, a triphosphate acrylate ester of a condensate of one mole of at least one alcohol having at least two carbon atoms and at least two hydroxyl groups with from about one to about ten moles of at least one alkylene oxide having from two to four carbon atoms per hydroxyl group of said alcohol, said condensate esterified so that from about 20% to about 80% of said hydroxyl groups of said condensate are esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride, the balance of said hydroxyl groups esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, or from about 20% to about 80% of said hydroxyl groups of said condensate esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, the balance of said hydroxyl groups esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride.
Claim 7
Dependent Claim
192 words
A coating composition containing finely divided magnetic particles in a resin and as a dispersant for said magnetic particles, a triphosphate acrylate ester of a condensate of one mole of at least one alcohol having at least two carbon atoms and at least two hydroxyl groups with from about one to about ten moles of at least one alkylene oxide having from two to four carbon atoms per hydroxyl group of said alcohol, said condensate esterified so that from about 20% to about 80% of said hydroxyl groups of said condensate are esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride, the balance of said hydroxyl groups esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, or from about 20% to about 80% of said hydroxyl groups of said condensate esterified at about 60 deg. C. to about 180 deg. C. with at least one ultraviolet or electron beam curable anionic vinyl monomer, the balance of said hydroxyl groups esterified at about 20 deg. C. to about 150 deg. C. with phosphorus oxychloride.
Claim 8
Dependent Claim
28 words
The coating composition of claim 5 wherein the ultraviolet or electron beam curable anionic vinyl monomer is selected from the group consisting of acrylic acid and methacrylic acid.
Claim 9
Dependent Claim
32 words
The coating composition of claim 5 wherein in said dispersant the alcohol is neopentylglycol, the alkylene oxide is ethylene oxide and the ultraviolet or electron beam curable vinyl monomer is acrylic acid.
Claim 10
Dependent Claim
33 words
The coating composition of claim 5 wherein in said dispersant the alcohol is neopentylglycol, the alkylene oxide is ethylene oxide and the ultraviolet or electron beam curable anionic vinyl monomer is methacrylic acid.
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |