US4910097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc alloy-plated corrosion preventive steel sheet having an organic coating layer thereon and a method for making the same
Assignee: Kobe Steel Ltd
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Filing: 1988-12-15
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Granted: 1990-03-20
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Expires: 2008-12-15
Abstract
Abstract A corrosion preventive steel sheet having an organic coating layer is described. The steel sheet is comprised of a zinc alloy-plated steel sheet, and a chromate layer and an organic coating layer formed in this order on at least one side of the steel sheet. The organic coating layer is formed from a coating composition comprised of 100 parts by weight of a water-soluble urethane resin and from 5 to 80 parts by weight of colloidal silica. A method for making the corrosion preventive steel sheet is also described.
Inventors
- 👤 Shingo Nomura
- 👤 Hirohiko Sakai
- 👤 Kanji Nakamura
- 👤 Etuo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:59
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/06; B; B05; B05D; B05D7/00; B05D7/50; B05D7/51; C09; C09D; C09D5/00; C09D5/08; C23C2/26; C23C2/28; C23C2/34; C23C2/36; C23C2/40; C23C28/00; C25; C25D; C25D11/00; C25D11/38; B05D2202/00; B05D2202/10; B05D2350/00; B05D2350/20; B05D2350/60; B05D2350/65; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12611; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
66 words
A corrosion preventive steel sheet which comprises a zinc alloy-plated steel sheet, and a chromate layer and an organic coating layer formed on at least one side of the steel sheet in this order, said organic coating layer being formed from a coating composition comprised of 100 parts by weight of a water-soluble urethane resin and from 5 to 80 parts by weight of colloidal silica.
Claim 2
Dependent Claim
66 words
A corrosion preventive steel sheet which comprises a zinc alloy-plated steel sheet, and a chromate layer and an organic coating layer formed on at least one side of the steel sheet in this order, said organic coating layer being formed from a coating composition comprised of 100 parts by weight of a water-soluble urethane resin and from 5 to 80 parts by weight of colloidal silica.
Claim 3
Dependent Claim
55 words
A corrosion preventive steel sheet according to claim 1, wherein said coating composition further comprises from 1 to 40 parts by weight of a silane coupling agent, from 1 to 20 parts by weight of a silicon or fluorine-containing water repellent, and from 1 to 20 parts by weight of a water-soluble isocyanate cross-linking agent.
Claim 4
Dependent Claim
43 words
A corrosion preventive steel sheet according to claim 1, wherein said coating composition further comprises from 1 to 20 parts by weight of a silicon or fluorine-containing water repellent and from 1 to 20 parts by weight of a water-soluble isocyanate crosslinking agent.
Claim 5
Dependent Claim
27 words
A corrosion preventive steel sheet according to claim 1, wherein said coating composition further comprises from 1 to 40 parts by weight of a silane coupling agent.
Claim 6
Dependent Claim
25 words
A corrosion preventive steel sheet according to claim 2, wherein said coating composition further comprises from 50 to 600 parts by weight of zinc powder.
Claim 7
Dependent Claim
23 words
A corrosion preventive steel sheet according to any of claims 1-4, wherein said Zn alloy-plated steel sheet is a Zn-Ni alloy-plated steel sheet.
Claim 8
Dependent Claim
28 words
A corrosion preventive steel sheet according to any of claims 1-4, wherein said chromate layer is formed in an amount of from 1 to 500 mg/m 2 .
Claim 9
Dependent Claim
29 words
A corrosion preventive steel sheet according to any of claims 1-4, wherein said organic coating layer is formed in an amount of from 0.5 to 5.0 g/m 2 .
Claim 10
Dependent Claim
42 words
A corrosion preventive steel sheet according to any of claims 1-4, wherein said isocyanate crosslinking agent is an aliphatic polyisocyanate having isocyanates groups capable of being released under baking conditions of not lower than 160° C. and not shorter than 3 minutes.
Claim 11
Dependent Claim
23 words
A corrosion preventive steel sheet according to any of claims 1-4, wherein said Zn alloy-plated steel sheet is a Zn-Fe alloy-plated steel sheet.
Claim 12
Dependent Claim
27 words
A corrosion preventive steel sheet according to claim 10, wherein said Zn-Fe alloy-plated steel sheet is a galvannealed steel sheet obtained by heating an Zn-plated steel sheet.
Claim 13
Dependent Claim
30 words
A corrosion preventive steel sheet according to claim 11, wherein the Zn-Fe alloy plating is made of an Zn-Fe alloy having an Fe content of from 6 to 20 wt%.
Claim 14
Dependent Claim
34 words
A corrosion preventive steel sheet according to any of claims 1-4, further comprising from 10 to 200 parts by weight of a nonmetallic powder per 100 parts by weight of said water-soluble organic resin.
Claim 15
Dependent Claim
18 words
A corrosion preventive steel sheet according to claim 13, wherein said nonmetallic powder is an SiO 2 powder.
Claim 16
Dependent Claim
22 words
A corrosion preventive steel sheet according to claim 13, wherein said nonmetallic powder has a size of from 0.1 to 5 micrometers.
Claim 17
Independent Claim
89 words
A method for making a corrosion preventive steel sheet which comprises: providing a zinc alloy-plated steel sheet having a chromate layer on at least one side thereof; applying onto the at least one side of steel sheet a coating composition comprised of 100 parts by weight of a water-soluble urethane resin, from 5 to 80 parts by weight of colloidal silica and 1 to 40 parts by weight of a silane coupling agent; and baking the applied composition to form a resin layer on the at least one side.
Claim 18
Independent Claim
89 words
A method for making a corrosion preventive steel sheet which comprises: providing a zinc alloy-plated steel sheet having a chromate layer on at least one side thereof; applying onto the at least one side of steel sheet a coating composition comprised of 100 parts by weight of a water-soluble urethane resin, from 5 to 80 parts by weight of colloidal silica and 1 to 40 parts by weight of a silane coupling agent; and baking the applied composition to form a resin layer on the at least one side.
Claim 19
Dependent Claim
65 words
A method according to claim 16, wherein said coating composition further comprises from 1 to 20 parts by weight of a silicon or fluorine-containing water repellent, and from 5 to 20 parts by weight of a water-soluble isocyanate crosslinking agent and the applied composition is baked at an ultimate temperature of from 90° to 200° C. for a time of from 15 to 120 seconds.
Claim 20
Dependent Claim
22 words
A method according to claim 16, wherein said coating composition further comprises from 50 to 600 parts by weight of zinc powder.
Claim 21
Dependent Claim
35 words
A method according to claim 16, wherein said coating composition said coating composition further comprises from 10 to 200 parts by weight of a nonmetallic powder per 100 parts by weight of said water-soluble resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |