US4419257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic coating composition
Assignee: Unisys Corp
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Filing: 1981-11-12
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Granted: 1983-12-06
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Expires: 2001-11-12
Abstract
Abstract A magnetic coating composition is disclosed of the type having magnetic particles dispersed in a resin binder. The improvement comprises the use of a solvent system including a dibasic ester wherein the solvent system has an initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has been evaporated from the binder.
Inventors
- 👤 Duncan W. Frew
- 👤 Zorro Stefanini
- 👤 Edward A. Schnee
- 👤 Leo di Ricco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; H; H01; H01F; H01F1/00; H01F1/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
In a magnetic coating composition of the type having magnetic particles dispersed in a resin binder, the improvements comprising the use of a phosphate-ester dispersant and a solvent system including a dibasic ester wherein said solvent system has a initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has evaporated from the binder.
Claim 2
Dependent Claim
73 words
In a magnetic coating composition of the type having magnetic particles dispersed in a resin binder, the improvements comprising the use of a phosphate-ester dispersant and a solvent system including a dibasic ester wherein said solvent system has a initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has evaporated from the binder.
Claim 3
Dependent Claim
19 words
The magnetic coating composition of claim 1 wherein said composition contains a phosphate-ester dispersant and a cellosolve/dibasic ester solvent.
Claim 4
Dependent Claim
24 words
The magnetic coating composition of claim 2 wherein the phosphate-ester dispersant and cellosolve dibasic ester solvent comprise approximately 5.2% of the total binder composition.
Claim 5
Dependent Claim
14 words
The magnetic coating composition of claim 1 wherein the resin is an epoxy-phenolic resin.
Claim 6
Dependent Claim
61 words
A magnetic coating composition of the type having magnetic particles dispersed in a phenolic-epoxy resin binder, the composition including sufficient of a phosphate-ester to both disperse the particles adequately as well as to catalyze sufficient cross-linking of phenolic and epoxy resin to yield a three-dimensional network of enhanced durability; the composition also including a solvent system with a dibasic ester component.
Claim 7
Dependent Claim
61 words
A magnetic coating composition of the type having magnetic particles dispersed in a phenolic-epoxy resin binder, the composition including sufficient of a phosphate-ester to both disperse the particles adequately as well as to catalyze sufficient cross-linking of phenolic and epoxy resin to yield a three-dimensional network of enhanced durability; the composition also including a solvent system with a dibasic ester component.
Claim 8
Dependent Claim
32 words
The combination as recited in claim 5 wherein the solvent system also exhibits a Hansen three-dimensional solubility above of approximately 10.5, initially, and a Hansen three-dimensional solubility below approximately 10.5 after drying.
Claim 9
Dependent Claim
25 words
The magnetic coating composition of claim 6 wherein said composition contains such an acidic phosphate-ester dispersant/catalyst and wherein the dibasic ester solvent also includes cellosolve.
Claim 10
Dependent Claim
24 words
The magnetic coating composition of claim 7 wherein the phosphate-ester dispersant/catalyst and cellosolve-dibasic ester solvent comprise, together, about 5% of the total binder composition.
Claim 11
Dependent Claim
35 words
The magnetic coating composition of claim 7 wherein the solvent exhibits a Hansen three-dimensional solubility of about 10.5-11.0 initially and about 9.3 to 10.0 after approximately 99% of the solvent has evaporated from the binder.
Claim 12
Dependent Claim
28 words
The combination as recited in claim 7 wherein the phosphate ester is the reaction product of mono and dibasic esters of a phosphoric acid and a non-ionic surfactant.
Claim 13
Dependent Claim
41 words
The combination as recited in claim 10 wherein the phosphate-ester dispersant/catalyst and the cellosolve-dibasic ester solvent exhibit a Hansen three-dimensional solubility of about 10.5-11.0 initially and about 9.3 to 10.0 after approximately 99% of the solvent has evaporated from the binder.
Claim 14
Dependent Claim
28 words
The combination as recited in claim 10 wherein the dibasic ester component comprises mixtures and separate components of a di-methyl succinate, a di-methyl glutarate and a di-methyl adipate.
Claim 15
Dependent Claim
28 words
The combination as recited in claim 5 wherein the dibasic ester component comprises mixtures and separate components of a di-alkyl succinate, a di-alkyl glutarate and a di-alkyl adipate.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |