EP0404333A2
Expired / Lapsed
EP
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Low friction macromolecular materials for coating disk and head surfaces
Assignee: Digital Equipment Corp
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Filing: 1990-05-15
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Granted: —
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Expires: 2010-05-15
Abstract
Abstract A low-friction, corrosion-resistant substrate includes a substrate and a macromolecular Langmuir-Blodgett film in coating relationship with the substrate, the film having a multiplicity of macromolecules, each including a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of substantially each macromolecule is bonded to a surface of the substrate and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air. The film may also include planar heterocyclic molecules. A low-friction corrosion-resistant read/write head and/or recording medium includes a Langmuir-Blodgett film in coating relationship with the surface thereof.
Inventors
- 👤 Paul Herman Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 20:00
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/20; B05D1/202; B82; B82Y; B82Y30/00; B82Y40/00; G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B5/00; G11B5/10; G11B5/62; G11B5/72; G11B5/725; G11B5/74; G11B5/82; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
76 words
A low-friction corrosion-resistant coated substrate comprising: (a) a substrate; and (b) a macromolecular Langmuir-Blodgett (L.B.) film in coating relationship with the substrate, the film comprised of macromolecules, each having a hydrophobic end group and a hydrophilic end group, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or an adhesion layer, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 2
Dependent Claim
76 words
A low-friction corrosion-resistant coated substrate comprising: (a) a substrate; and (b) a macromolecular Langmuir-Blodgett (L.B.) film in coating relationship with the substrate, the film comprised of macromolecules, each having a hydrophobic end group and a hydrophilic end group, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or an adhesion layer, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 3
Dependent Claim
12 words
The substrate of claim 1 wherein the substrate is a magnetic disk.
Claim 4
Dependent Claim
13 words
The substrate of claim 1 wherein the substrate is a thermo-magneto optical disk.
Claim 5
Dependent Claim
20 words
The substrate of claim 1 wherein the L.B. film coating is less than or equal to about 30Å or 75Å.
Claim 6
Dependent Claim
12 words
The substrate of claim 1 wherein the macromolecules are cross-linked and/or polymerized.
Claim 7
Dependent Claim
19 words
The substrate of claim 1 wherein the film coating comprises a plurality of monolayers substantially of fatty acid molecules.
Claim 8
Dependent Claim
14 words
The substrate of claim 6 wherein the fatty acid molecules are stearic acid molecules.
Claim 9
Dependent Claim
26 words
The substrate of claim 1 wherein the L.B. film coating comprises a plurality of monolayers with anti-friction properties essentially the same as a monolayer of polytetrafluoroethylene.
Claim 10
Dependent Claim
35 words
The substrate of claim 8 wherein each of the monolayers includes stearic acid molecules, each with its methyl group replaced by a CF x group, wherein x may take the value 1, 2, or 3.
Claim 11
Dependent Claim
17 words
A low-friction, corrosion resistant coated substrate comprising a substrate and a coating film including planar heterocyclic molecules.
Claim 12
Dependent Claim
17 words
A low-friction, corrosion resistant coated substrate comprising a substrate and a coating film including planar heterocyclic molecules.
Claim 13
Dependent Claim
12 words
The substrate of claim 10 wherein the molecules are planar metal phthalocyanines.
Claim 14
Independent Claim
80 words
A method for making a low-friction corrosion-resistant coated substrate comprising the step of: applying a Langmuir-Blodgett (L.B.) film coating to the surface of a substrate, wherein the L.B. film coating includes macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or to an adhesion layer and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 15
Independent Claim
80 words
A method for making a low-friction corrosion-resistant coated substrate comprising the step of: applying a Langmuir-Blodgett (L.B.) film coating to the surface of a substrate, wherein the L.B. film coating includes macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or to an adhesion layer and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 16
Dependent Claim
20 words
The method of claim 12 wherein the L.B. film coating is less than or equal to about 30Å or 75Å.
Claim 17
Dependent Claim
25 words
The method of claim 12 further comprising the step of subsequently cross-linking the macromolecules to improve the thermal and/or wear properties of the L.B. film.
Claim 18
Dependent Claim
29 words
The method of claim 12 wherein the L.B. film coating comprises a plurality of monolayers with anti-friction properties essentially the same as those of a monolayer essentially of polytetrafluorethylene.
Claim 19
Dependent Claim
37 words
The method of claim 15 wherein each of the monolayers is a monolayer which includes molecules whose terminal methyl group is replaced by a CF x group, wherein x may take the value 1, 2, or 3.
Claim 20
Dependent Claim
18 words
The method of claim 12 wherein the film coating comprises a plurality of monolayers including fatty acid molecules.
Claim 21
Dependent Claim
16 words
The method of claim 17 wherein the fatty acid molecules are stearic acid molecules or polyacetylenes.
Claim 22
Independent Claim
31 words
A method for making a low-friction corrosion-resistant coating on a substrate comprising the step of: applying a film including planar or nearly planar heterocyclic molecules to the surface of a substrate.
Claim 23
Independent Claim
31 words
A method for making a low-friction corrosion-resistant coating on a substrate comprising the step of: applying a film including planar or nearly planar heterocyclic molecules to the surface of a substrate.
Claim 24
Dependent Claim
12 words
The method of claim 19 wherein the molecules are planar metal phthalocyanines.
Claim 25
Independent Claim
101 words
A method for the reduction of friction between a read/write head and the surface of a rotating disk recording medium comprising: the application of a Langmuir-Blodgett (L.B.) film coating to the surface of a recording substrate, wherein the L.B. film coating includes macromolecules, each including a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the recording substrate or to an adhesion layer of uniform or nearly uniform energy upon the substrate, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 26
Independent Claim
101 words
A method for the reduction of friction between a read/write head and the surface of a rotating disk recording medium comprising: the application of a Langmuir-Blodgett (L.B.) film coating to the surface of a recording substrate, wherein the L.B. film coating includes macromolecules, each including a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the recording substrate or to an adhesion layer of uniform or nearly uniform energy upon the substrate, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 27
Dependent Claim
20 words
A method of claim 21 wherein the L.B. film coating is less than or equal to about 30Å or 75Å.
Claim 28
Dependent Claim
14 words
The method of claim 21 further comprising the step of subsequently cross-linking the macrcmolecules.
Claim 29
Dependent Claim
19 words
The method of claim 21 wherein the film coating comprises a plurality of monolayers essentially of fatty acid molecules.
Claim 30
Dependent Claim
14 words
The method of claim 24 wherein the fatty acid molecules are stearic acid molecules.
Claim 31
Dependent Claim
28 words
The method of claim 21 wherein the L.B. film coating comprises plurality of monolayers with anti-friction properties substantially the same as those of a monolayer essentially of polytetrafluroethylene.
Claim 32
Dependent Claim
38 words
The method of claim 26 wherein each of the monolayers is a monolayer including stearic acid molecules whose terminal methyl group is replaced by a CF x group, wherein x may take the value 1, 2, or 3.
Claim 33
Independent Claim
31 words
A method for the reduction of friction induced between a read/write head and the surface of a rotating disk recording medium comprising the application of a film including planar heterocyclic molecules.
Claim 34
Independent Claim
31 words
A method for the reduction of friction induced between a read/write head and the surface of a rotating disk recording medium comprising the application of a film including planar heterocyclic molecules.
Claim 35
Independent Claim
72 words
A method for the exclusion of moisture from the surface of a disk recording medium comprising the application of a L.B. film coating of a multiplicity of macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of a recording substrate and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 36
Independent Claim
72 words
A method for the exclusion of moisture from the surface of a disk recording medium comprising the application of a L.B. film coating of a multiplicity of macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of a recording substrate and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 37
Dependent Claim
13 words
The method of claim 29, wherein the hydrophobic end-group is an aromatic group.
Claim 38
Dependent Claim
24 words
The method of claim 29, wherein the hydrophobic end-group is a CF x group, wherein x may take the value 1, 2, or 3.
Claim 39
Dependent Claim
75 words
A low-friction, corrosion-resistant read/write head comprising: (a) a read/write head; and (b) a macromolecular Langmuir-Blodgett (L.B.) film in coating relationship with the read/write head, the film including a multiplicity of macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 40
Dependent Claim
75 words
A low-friction, corrosion-resistant read/write head comprising: (a) a read/write head; and (b) a macromolecular Langmuir-Blodgett (L.B.) film in coating relationship with the read/write head, the film including a multiplicity of macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 41
Dependent Claim
35 words
The head of claim 32 wherein the L.B. film coating is less than or equal to about 30Å or 75Å, the film coating at least being over a portion of the head air bearing surface.
Claim 42
Dependent Claim
23 words
The head of claim 32 wherein the macromolecules are cross-linked in a post-polymerization step to improve the thermal stabilization of the L.B. film.
Claim 43
Dependent Claim
22 words
The head of claim 32 wherein the film coating comprises a plurality of monolayers which includes fatty acid molecules or polyacetylene molecules.
Claim 44
Dependent Claim
14 words
The head of claim 35 wherein the fatty acid molecules are stearic acid molecules.
Claim 45
Dependent Claim
28 words
The head of claim 32 wherein the L.B. film coating comprises a plurality of monolayers with anti- friction properties essentially the same as a monolayer essentially of polytetrafluoroethylene.
Claim 46
Dependent Claim
35 words
The head of claim 37 wherein each of the monolayers includes stearic acid molecules, each with its methyl group replaced by a CF x group, wherein x may take the value 1, 2, or 3.
Claim 47
Dependent Claim
19 words
A low-friction, corrosion-resistant, read/write head comprising a read/write head and a coating of a film including planar heterocyclic molecules.
Claim 48
Dependent Claim
19 words
A low-friction, corrosion-resistant, read/write head comprising a read/write head and a coating of a film including planar heterocyclic molecules.
Claim 49
Dependent Claim
12 words
The head of claim 39 herein the molecules are planar metal phthalocyanines.
Claim 50
Independent Claim
77 words
A method for making a low-friction corrosion-resistant read/write head comprising the step of: applying a Langmuir-Blodgett (L.B.) film coating to the surface of a read/write head, wherein the L.B. film coating includes macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 51
Independent Claim
77 words
A method for making a low-friction corrosion-resistant read/write head comprising the step of: applying a Langmuir-Blodgett (L.B.) film coating to the surface of a read/write head, wherein the L.B. film coating includes macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
Claim 52
Dependent Claim
17 words
The method of claim 41 wherein the L.B. film coating is not thicker than 30Å, or 75Å.
Claim 53
Dependent Claim
24 words
The method of claim 41 further comprising the step of subsequently cross-linking the macromolecules to improve the thermal stability properties of the L.B. film.
Claim 54
Dependent Claim
29 words
The method of claim 41 wherein the L.B. film coating comprises a plurality of monolayers with anti-friction properties essentially the same as those of a monolayer essentially of polytetrafluoroethylene.
Claim 55
Dependent Claim
37 words
The method of claim 44 wherein each of the monolayers is a monolayer including molecules whose terminal methyl group is replaced by a CF x , group wherein x may take the value 1, 2, or 3.
Claim 56
Dependent Claim
19 words
The method of claim 41 wherein the film coating comprises a plurality of monolayers which includes fatty acid molecules.
Claim 57
Dependent Claim
16 words
The method of claim 46 wherein the fatty acid molecules are stearic acid molecules or polyacetylenes.
Claim 58
Independent Claim
26 words
A method for making a low-friction read/write head comprising the step of: applying a film including planar heterocyclic molecules to the surface of a read/write head.
Claim 59
Independent Claim
26 words
A method for making a low-friction read/write head comprising the step of: applying a film including planar heterocyclic molecules to the surface of a read/write head.
Claim 60
Dependent Claim
12 words
The method of claim 45 wherein the molecules are planar metal phthalocyanines.
Claim 61
Dependent Claim
19 words
The method of claim 45 wherein the molecules are planar metal phthalocyanines used in conjunction with a perfluorinated polyether.
Claim 62
Dependent Claim
19 words
The method of claim 10 wherein the molecules are planar metal phthalocyanines used in conjunction with a perfluorinated polyether.
References Cited (Backward Citations)
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