US4762865A — Epoxy coatings for computer hard disks and metal …

Claim 1

Independent Claim 317 words

A water based dispersion system for coating particles selected from the group consisting of magnetic and pigment particles onto a substrate comprising: water sufficient to form a dispersion, at least one adhesive plasticizer (Additive A), at least one adhesive polymer (Additive B), at least one surface active agent, an optional dispersing agent, at least one solid epoxy resin of the formula ##STR9## where n would range from about an average of 1.5 to 4 or 5 or greater, wherein Additive A is of the general formula Y--CO--NX--CH.sub.2 --P and Y is selected from the group consisting of H, an akyl group of C 1 -C 4 , an alkylene group of C 2 -C 3 , an ethanol, propanol or isopropanol group, a 2-3 carbon ether group, and a C 1 -C 3 haloalkyl group, said halo selected from the group consisting of being chloro or fluoro, wherein X is H or CH 3 and P is selected from the group consisting of moieties of polyhydroxybenzene compounds, substituted or unsubstituted ortho, meta and para aminophenols and aromatic diamines, and wherein Additive B is a water soluble or dispersible polymer which was formed by the copolymerization of a first component which has at least 5% of its monomer constitutents being derived from a monomer selected from the group consisting of acrylamide and methacrylamide, and the balance being a second component of one or more vinyl monomers copolymerizable with said first component, thereby having yielded an amido copolymerizate, said amido copolymerizate having been further condensed with formaldehyde to the extent of from 5% to 95% of the amide groups, said condensed amido copolymerizate having been still further condensed with a member selected from the group consisting of a polyhydroxy aromatic compound, an amino hydroxy aromatic compound, or a diamino aromatic compound, and sufficient magnetic or pigment particles of a size suitable for dispersion as a film upon a substrate.

Claim 2

Dependent Claim 317 words

A water based dispersion system for coating particles selected from the group consisting of magnetic and pigment particles onto a substrate comprising: water sufficient to form a dispersion, at least one adhesive plasticizer (Additive A), at least one adhesive polymer (Additive B), at least one surface active agent, an optional dispersing agent, at least one solid epoxy resin of the formula ##STR9## where n would range from about an average of 1.5 to 4 or 5 or greater, wherein Additive A is of the general formula Y--CO--NX--CH.sub.2 --P and Y is selected from the group consisting of H, an akyl group of C 1 -C 4 , an alkylene group of C 2 -C 3 , an ethanol, propanol or isopropanol group, a 2-3 carbon ether group, and a C 1 -C 3 haloalkyl group, said halo selected from the group consisting of being chloro or fluoro, wherein X is H or CH 3 and P is selected from the group consisting of moieties of polyhydroxybenzene compounds, substituted or unsubstituted ortho, meta and para aminophenols and aromatic diamines, and wherein Additive B is a water soluble or dispersible polymer which was formed by the copolymerization of a first component which has at least 5% of its monomer constitutents being derived from a monomer selected from the group consisting of acrylamide and methacrylamide, and the balance being a second component of one or more vinyl monomers copolymerizable with said first component, thereby having yielded an amido copolymerizate, said amido copolymerizate having been further condensed with formaldehyde to the extent of from 5% to 95% of the amide groups, said condensed amido copolymerizate having been still further condensed with a member selected from the group consisting of a polyhydroxy aromatic compound, an amino hydroxy aromatic compound, or a diamino aromatic compound, and sufficient magnetic or pigment particles of a size suitable for dispersion as a film upon a substrate.

Claim 3

Dependent Claim 23 words

The dispersion system of claim 1 wherein the particles are magnetic and suitable for use in the manufacture of a Winchester hard disk.

Claim 4

Dependent Claim 24 words

The composition of claim 2 further including a water dispersible solid epoxy resin of molecular weight of about 500 capable of binding magnetic particles.

Claim 5

Dependent Claim 20 words

The dispersion system of claim 1 wherein the particles are colored and suitable for forming a coating for metallic coils.

Claim 6

Dependent Claim 12 words

The dispersion system of claim 4 wherein the particles are Montana talc.

Claim 7

Dependent Claim 13 words

The dispersion system of claim 4 wherein the particles are yellow iron oxide.

Claim 8

Dependent Claim 18 words

The dispersion of claim 4 wherein the particle are any colored pigment suitable for dispersion in aqueous latices.

Claim 9

Dependent Claim 34 words

In the system of claim 1 wherein the adhesive plasticizer, Additive A, is a condensation product of N-hydroxymethylacrylamide with a soluble compound selected from the group consisting of polyhydroxyaromatic compounds, aminophenols and aromatic diamines.

Claim 10

Dependent Claim 41 words

In the composition of claim 8 wherein Additive A is a condensation product of N-hydroxymethyl acrylamide with a polyhydroxy aromatic compound, wherein said polyhydroxy aromatic compounds are selected from a group consisting of resorcinol, catechol, hydroquinone, hydroxyethyl resorcinol and n-butyl catechol.

Claim 11

Dependent Claim 42 words

In the composition of claim 8 wherein Additive A is a condensation product formed from the reaction of N-hydroxymethyl acrylamide with aminophenols, said aminophenols being selected from the group consisting of o, m and p-aminophenol, the methyl aminophenols and the hydroxyethyl aminophenols.

Claim 12

Dependent Claim 54 words

In the composition of claims 8 wherein Additive A is a condensation product formed from the reaction of N-hydroxymethyl acrylamide with aromatic diamino compounds, such members of the diamino aromatics being selected from the o, m and p-diamino benzenes, the o, m and p-diamino toluenes and the various isomers of the hydroxyethyl diamino benzenes.

Claim 13

Dependent Claim 50 words

In the system of claim 1 wherein the adhesive polymer, Additive B, is a condensation product of polymers and copolymers of acrylamide with a partial molecular equivalent of formaldehyde, followed by further condensation with a soluble compound selected from a group consisting of polyhydroxy aromatic compounds, aminophenols, and aromatic diamines.

Claim 14

Dependent Claim 59 words

In the composition of claim 12 wherein Additive B is a condensation product of polymers and copolymers of acrylamide with a partial molecular equivalent of formaldehyde, followed by a further condensation with a soluble compound selected from the group consisting of a polyhydroxy aromatic compound selected from the group consisting of resorcinol, catechol, hydroquinone, hydroxyethyl resorcinol and n-butyl catechol.

Claim 15

Dependent Claim 50 words

In the composition of claim 12 wherein Additive B is a condensation product of polymers and copolymers of acrylamide with a partial molecular equivalent of formaldehyde, followed by further condensation with a soluble aminophenol compound selected from the group consisting of o, m, and p-aminophenol, the methyl-aminophenols and hydroxyethyl aminophenols.

Claim 16

Dependent Claim 51 words

In the composition of claim 12 wherein Additive B is a condensation product of polymers and copolymers of acrylamide with a partial molecular equivalent of formaldehyde, followed by further condensation with a soluble aromatic diamine selected from the group consisting of o, m and p-diamino benzene, diaminotoluenes and the hydroxyethyl diaminobenzenes.

Claim 17

Dependent Claim 71 words

A water based dispersion system for coating magnetic particles onto a substrate composition as in claim 1 wherein there is water sufficient to form a dispersion of the magnetic particles with proportional amounts of Additives A and B and a solid epoxy resin capable of binding magnetic particles, said resin being of the formula: ##STR10## where n would range from about an average of 1.5 to 4 or 5 or greater.

Claim 18

Dependent Claim 27 words

In the system of claim 1 wherein the surface active agent is a mixture of a higher alkyl succino sulfate and a fatty acid amide of diethanolamine.

Claim 19

Dependent Claim 29 words

In the system of claim 1 wherein the surface active agent is a mixture of a fatty acid amide of diethanolamine and a salt of a complex amphoteric aminoacid.

Claim 20

Dependent Claim 40 words

In the system of claim 1 wherein the surface active agent is one member of the group consisting of a mixture of a higher alkyl succino sulfate and a complex organic phosphate ester acid and a surface active silicone compound.

Claim 21

Dependent Claim 23 words

In the system of claim 1 wherein the composition further including a dispersant which is a low molecular weight salt of polyacrylic acid.

Claim 22

Dependent Claim 129 words

A water based dispersion system for coating magnetic particles onto a substrate comprising: I. water sufficient to form a dispersion; II. a magnetic iron oxide suitable for audio, video and data recording; III. an adhesive plasticizer, Additive A, prepared by the combination of N-hydroxymethyl acrylamide with a compound Y; IV. an adhesive polymer Additive B, which polymer is prepared by the condensation of polymers and copolymers of acylamide with about 0.25 molecular equivalent of a compound Y; wherein said compound Y is selected from the group consisting of polyhydroxy aromatics, the amino phenols and the aromatic diamines, V. a solid epoxy resin of the formula: ##STR11## where n would range from about an average of 1.5 to 4 or 5 or greater; VI. a surfactant; VII. an optional dispersant.

Claim 23

Dependent Claim 129 words

A water based dispersion system for coating magnetic particles onto a substrate comprising: I. water sufficient to form a dispersion; II. a magnetic iron oxide suitable for audio, video and data recording; III. an adhesive plasticizer, Additive A, prepared by the combination of N-hydroxymethyl acrylamide with a compound Y; IV. an adhesive polymer Additive B, which polymer is prepared by the condensation of polymers and copolymers of acylamide with about 0.25 molecular equivalent of a compound Y; wherein said compound Y is selected from the group consisting of polyhydroxy aromatics, the amino phenols and the aromatic diamines, V. a solid epoxy resin of the formula: ##STR11## where n would range from about an average of 1.5 to 4 or 5 or greater; VI. a surfactant; VII. an optional dispersant.

Claim 24

Dependent Claim 22 words

A hard disk comprising a data recording industry substrate suitable for the recording of information, coated with the dispersion of claim 21.

Claim 25

Dependent Claim 102 words

A water based dispersion system for coating magnetic particles onto a substrate comprising: water sufficient to form a dispersion with all of the following: a high coercivity magnetic iron oxide, an adhesive plasticizer prepared by the condensation of N-hydroxymethyl acrylamide with an equivalent amount of resorcinol, an adhesive binder prepared by the condensation of a polyacrylamide with one-fourth the molecular equivalent of formaldehyde followed by further condensation with catechol, a Bisphenol A based solid epoxy resin, a surfactant mixture of an oleic acid amide of diethanolamine and a salt of a complex amphoteric amino acid, a dispersant and an optional anti-foam agent.

Claim 26

Dependent Claim 102 words

A water based dispersion system for coating magnetic particles onto a substrate comprising: water sufficient to form a dispersion with all of the following: a high coercivity magnetic iron oxide, an adhesive plasticizer prepared by the condensation of N-hydroxymethyl acrylamide with an equivalent amount of resorcinol, an adhesive binder prepared by the condensation of a polyacrylamide with one-fourth the molecular equivalent of formaldehyde followed by further condensation with catechol, a Bisphenol A based solid epoxy resin, a surfactant mixture of an oleic acid amide of diethanolamine and a salt of a complex amphoteric amino acid, a dispersant and an optional anti-foam agent.

Claim 27

Dependent Claim 18 words

The dispersion system of claim 23 deposited upon substrate suitable as a substrate for the recording of information.

Claim 28

Dependent Claim 36 words

A hard magnetic disk composition comprising a magnetic ferrite, water, a resorcinol based Additive A; a meta-aminophenol based Additive B; a solid epoxy resin, a dispersing agent, a surface active agent, and sufficient water for processing.

Claim 29

Dependent Claim 36 words

A hard magnetic disk composition comprising a magnetic ferrite, water, a resorcinol based Additive A; a meta-aminophenol based Additive B; a solid epoxy resin, a dispersing agent, a surface active agent, and sufficient water for processing.

Claim 30

Dependent Claim 19 words

In the composition of claim 25, wherein the Additive A and the Additive B are each meta-toluene diamine based.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-08-09	1992-02-08	1992-08-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-08-09	1996-02-08	1996-08-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-08-09	2000-02-08	2000-08-09	$7700.00	Window Closed / Lapsed

Epoxy coatings for computer hard disks and metal coil decoration and protection

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag