US4025692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming corrosion-resistant coating on a steel sheet
Assignee: JFE Engineering Corp
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Filing: 1975-06-10
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Granted: 1977-05-24
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Expires: 1995-06-10
Abstract
Abstract A steel sheet coating having high corrosion-resistivity and paint-adhesivity can be obtained by applying a water solution of specific composition described hereinafter on a steel sheet, followed by drying; and exposing the coating to ultraviolet rays in an air atmosphere; said water solution contains a chemical compound which has been prepared by reacting a prepolymer of an epoxy resin with acrylic acid or methacrylic acid in order to introduce vinyl groups into the molecules of said prepolymer, another chemical compound of chromate or dichromate for chelation and a molybdenum compound as a stabilizer.
Inventors
- 👤 Hidehisa Yamagishi
- 👤 Atuhiko Murao
- 👤 Hisao Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:04
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C09D163/00; C09D163/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
A method for forming a corrosion-resistant coating on a steel sheet which comprises applying a water solution on the surface of said steel sheet, followed by drying; and exposing the coated surface to ultraviolet rays having a main wave length of 365 mμ in an air atmosphere to obtain a cured coating; wherein said water solution contains a composition comprising (i) a prepolymer of an epoxy resin selected from the group consisting of bisphenol and novolak-phenol type reacted with an acid selected from the group consisting of acrylic acid and methacrylic acid, (ii) a chelate-forming compound selected from the group consisting of a chromate and a dichromate, and (iii) a water-soluble compound of molybdenum to stabilize said water solution.
Claim 2
Independent Claim
119 words
A method for forming a corrosion-resistant coating on a steel sheet which comprises applying a water solution on the surface of said steel sheet, followed by drying; and exposing the coated surface to ultraviolet rays having a main wave length of 365 mμ in an air atmosphere to obtain a cured coating; wherein said water solution contains a composition comprising (i) a prepolymer of an epoxy resin selected from the group consisting of bisphenol and novolak-phenol type reacted with an acid selected from the group consisting of acrylic acid and methacrylic acid, (ii) a chelate-forming compound selected from the group consisting of a chromate and a dichromate, and (iii) a water-soluble compound of molybdenum to stabilize said water solution.
Claim 3
Dependent Claim
17 words
A method of claim 1, wherein (i) comprises said prepolymer reacted with said acid and phosphoric acid.
Claim 4
Dependent Claim
102 words
A method of claim 1, wherein said water solution contains a mixture of a composition (A) comprising (i) a prepolymer of an epoxy resin selected from the group consisting of bisphenol and novolak-phenol type reacted with an acid selected from the group consisting of acrylic acid and methacrylic acid, (ii) a chelate-forming compound selected from the group consisting of a chromate and a dichromate, and (iii) a water-soluble compound of molybdenum to stabilize said water solution, and a composition (B) comprising (i) said prepolymer reacted with said acid and phosphoric acid, (ii) said chelate-forming compound, and (iii) said water-soluble compound of molybdenum.
Claim 5
Dependent Claim
27 words
The method of claim 1, wherein 1 mol of the prepolymer of epoxy resin is reacted with from 1 to 3 mols of acrylic or methacrylic acid.
Claim 6
Dependent Claim
36 words
The method of claim 2, wherein 1 mol of the prepolymer of epoxy resin is reacted with from 1 to 3 mols of acrylic or methacrylic acid and from 1 to 5 mols of phosphoric acid.
Claim 7
Dependent Claim
30 words
The method of claim 1, wherein said composition comprises 100 parts by weight of the prepolymer of epoxy resin and from 0.01 to 100 parts by weight of a chromate.
Claim 8
Dependent Claim
30 words
The method of claim 2, wherein said composition comprises 100 parts by weight of the prepolymer of epoxy resin and from 0.01 to 100 parts by weight of a chromate.
Claim 9
Dependent Claim
29 words
The method of claim 1, wherein said water solution contains from 5 to 7 percent by weight of said molybdenum compound based on the weight of said water solution.
Claim 10
Dependent Claim
29 words
The method of claim 2, wherein said water solution contains from 5 to 7 percent by weight of said molybdenum compound based on the weight of said water solution.
Claim 11
Dependent Claim
36 words
The method of claim 1, wherein a water solution of the prepolymer of epoxy resin reacted with acrylic acid or methacrylic acid and a water solution of a chromate are applied separately to said steel sheet.
Claim 12
Dependent Claim
39 words
The method of claim 2, wherein a water solution of the prepolymer of epoxy resin reacted with acrylic acid or methacrylic acid and phosphoric acid, and a water solution of a chromate are applied separately to said steel sheet.
Claim 13
Dependent Claim
13 words
The method of claim 1, wherein the water-soluble molybdenum compound is ammonium molybdate.
Claim 14
Dependent Claim
13 words
The method of claim 2, wherein the water-soluble molybdenum compound is ammonium molybdate.
Claim 15
Dependent Claim
13 words
The method of claim 3, wherein the water-soluble molybdenum compound is ammonium molybdate.
Claim 16
Dependent Claim
15 words
A steel sheet coated with a corrosion-resistant layer prepared by the method of claim 1.
Claim 17
Dependent Claim
15 words
A steel sheet coated with a corrosion-resistant layer prepared by the method of claim 2.
Claim 18
Dependent Claim
15 words
A steel sheet coated with a corrosion-resistant layer prepared by the method of claim 3.
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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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |