US4397751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disk coatings
Assignee: International Business Machines Corp
•
Filing: 1981-05-04
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Granted: 1983-08-09
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Expires: 2001-05-04
Abstract
Abstract A magnetic disk coating composition contains magnetic particles and a binder system comprising epoxy and phenolic resins, a titanate coupling agent and a water miscible solvent system, the coating having a pigment volume concentration of up to 35.
Inventors
- 👤 Heidi L. Dickstein
- 👤 William H. Dickstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7028; C; C09; C09D; C09D161/00; C09D161/04; C09D161/06; C09D163/00; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A mixture for coating a magnetic recording member to produce a magnetic coating having magnetic particles in a binder system in a pigment volume concentration of up to 35, where pigment volume concentration is defined as the ratio of the volume of said magnetic particles to the sum of the volume of said binder system and the volume of said magnetic particles, comprising said binder system including a water-miscible solvent system comprising glycol ethyl ether, hydroxyethylacetate and diethyleneglycolbutylether, an epoxy resin selected from a group of epoxy resins which are soluble in each component of said water-miscible solvent system, a phenolic resin selected from a group of phenolic resins which are soluble in each component of said water-miscible solvent system, and a titanate coupling agent for improving the bond of said magnetic particles to said resins and for catalyzing the cross-linking of said resins, each of said components of said water-miscible solvent system being compatible with said titanate coupling agent.
Claim 2
Dependent Claim
160 words
A mixture for coating a magnetic recording member to produce a magnetic coating having magnetic particles in a binder system in a pigment volume concentration of up to 35, where pigment volume concentration is defined as the ratio of the volume of said magnetic particles to the sum of the volume of said binder system and the volume of said magnetic particles, comprising said binder system including a water-miscible solvent system comprising glycol ethyl ether, hydroxyethylacetate and diethyleneglycolbutylether, an epoxy resin selected from a group of epoxy resins which are soluble in each component of said water-miscible solvent system, a phenolic resin selected from a group of phenolic resins which are soluble in each component of said water-miscible solvent system, and a titanate coupling agent for improving the bond of said magnetic particles to said resins and for catalyzing the cross-linking of said resins, each of said components of said water-miscible solvent system being compatible with said titanate coupling agent.
Claim 3
Dependent Claim
19 words
A mixture in accordance with claim 1, in which said binder system includes at least one flow additive material.
Claim 4
Dependent Claim
45 words
A mixture in accordance with claim 1, in which the ingredients are present in said mixture in the following range of proportions: ______________________________________
Ingredient Parts (Weight/weight)
______________________________________
Epoxy Resin 20-26
Phenolic Resin 40-52
Titanate Coupling Agent
0.5-2.0
Water Miscible Solvents
150-190
Magnetic Particles
80-110
______________________________________
Claim 5
Dependent Claim
43 words
A mixture in accordance with claim 1, in which the ingredients are present in said mixture in the following proportions: ______________________________________
Ingredient Parts (Weight/weight)
______________________________________
Epoxy Resin 24
Phenolic Resin 48
Titanate Coupling Agent
1.4
Water Miscible Solvents
174
Magnetic Particles
95
______________________________________
Claim 6
Dependent Claim
24 words
A mixture in accordance with claim 3, including at least one flow additive material present in a range from 3 to 7 parts weight/weight.
Claim 7
Dependent Claim
22 words
A mixture in accordance with claim 1, including at least one flow additive material present in an amount of 5 parts weight/weight.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |