US4876160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic composite-plated steel sheet
Assignee: Nippon Steel Corp
•
Filing: 1988-06-29
•
Granted: 1989-10-24
•
Expires: 2008-06-29
Abstract
Abstract Disclosed is a steel sheet having an organic composite plating layer excellent in press workability, spot weldability, electrodeposition coatability and corrosion resistance which comprises a zinc plated, aluminum plated or zinc base composite alloy plated steel sheet, a first layer of an insoluble chromate film of 5% or less in the content of water-soluble matter formed on the surface of the steel sheet at a coverage of 10-150 mg/m 2 in terms of chromium content and a second layer of a coating composition having the following composition coated at a thickness of 0.3-5 μm as a solid film on said first layer: (A) a bisphenol type epoxy resin having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more of solid matter in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid matter in the epoxy resin of 1/10 -20/10, (C) fumed silica having an average particle size of 0.1-100 in an amount of 5-50% by weight of solid matter in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content of the coating composition being 10-50% by weight.
Inventors
- 👤 Yoshio Shindou
- 👤 Motoo Kabeya
- 👤 Takashi Shimazu
- 👤 Fumio Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:50
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/51; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/58; C09; C09D; C09D175/00; C09D175/04; C25; C25D; C25D11/00; C25D11/38; C08G2150/00; C08G2150/90; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12611; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
215 words
A steel sheet having an organic composite plating layer which comprises a steel sheet plated with zinc, aluminum or zinc base composite alloy as a substrate, a first layer of insoluble chromate film of 5% or less in content of water-soluble matter formed on the surface of said substrate at a coverage of 10-150 mg/m 2 in terms of total chromium content and a second layer from a coating composition having the following composition coated at a thickness of 0.3-5 μm as a solid content film on said first layer: (A) a bisphenol type epoxy resin having terminal epoxy groups and having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more based on solid content in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid content in the epxoxy resin of 1/10-20/10, (C) fumed silica having an average particle size of 0.1-100 mμ in an amount of 5-50% by weight based on solid content in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content in the coating composition being 10-50% by weight.
Claim 2
Dependent Claim
215 words
A steel sheet having an organic composite plating layer which comprises a steel sheet plated with zinc, aluminum or zinc base composite alloy as a substrate, a first layer of insoluble chromate film of 5% or less in content of water-soluble matter formed on the surface of said substrate at a coverage of 10-150 mg/m 2 in terms of total chromium content and a second layer from a coating composition having the following composition coated at a thickness of 0.3-5 μm as a solid content film on said first layer: (A) a bisphenol type epoxy resin having terminal epoxy groups and having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more based on solid content in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid content in the epxoxy resin of 1/10-20/10, (C) fumed silica having an average particle size of 0.1-100 mμ in an amount of 5-50% by weight based on solid content in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content in the coating composition being 10-50% by weight.
Claim 3
Dependent Claim
31 words
A steel sheet according to claim 1 wherein the ketone organic solvent (D) is at least one compound selected from the group consisting of methyl isobutyl ketone, acetone, cyclohexanone and isophorone.
Claim 4
Dependent Claim
32 words
A steel sheet according to claim 1 wherein the coating composition additionally contains a resol type phenolic resin at a weight ratio to solid content in the curing agent (B) of 10/1-1/10.
Claim 5
Dependent Claim
43 words
A steel sheet according to claim 3 wherein the resol type phenolic resin is represented by the following formula: ##STR6## wherein n represents 0-4, W represents --CH 2 -- or --CH 2 --O--CH 2 --and R represents CH 3 , H or ##STR7##
Claim 6
Dependent Claim
31 words
A steel sheet according to claim 1 wherein the coating composition additionally contains a polyethylene wax in an amount of 0.1-10% by weight based on solid content of the coating composition.
Claim 7
Dependent Claim
21 words
A steel sheet according to claim 5 wherein the polyethylene wax has an acid value of 15 KOH mg/g or less.
Claim 8
Dependent Claim
43 words
A steel sheet according to claim 1 wherein the bisphenol type epoxy resin (A) is represented by the following formula: ##STR8## wherein R represents H or CH 3 and --A-- represents >C(CH 3 ) 2 , --CH 2 --, --O--, ##STR9## or --S--.
Claim 9
Dependent Claim
32 words
A steel sheet according to claim 7 wherein the coating composition additionally contains a resol type phenolic resin at a weight ratio to solid content in the curing agent (B) of 10/1-1/10.
Claim 10
Dependent Claim
31 words
A steel sheet according to claim 7 wherein the coating composition additionally contains a polyethylene wax in an amount of 0.1-10% by weight based on solid content of the coating composition.
Claim 11
Dependent Claim
69 words
A steel sheet according to claim 9 wherein the coating composition additionally contains a resol type phenolic resin at a weight ratio to solid content in the curing agent (B) of 10/1-1/10 and wherein the resol type phenolic resin is represented by the following formula: ##STR10## wherein n represent 0-4, W represents --CH 2 -- or --CH 2 --O--CH 2 --and R represents CH 3 , H or ##STR11##
Claim 12
Dependent Claim
46 words
A steel sheet according to claim 10 wherein the polyethylene wax has an acid value of 15 KOH mg/g or less and wherein the ketone organic solvent (D) is at least one compound selected from the group consisting of methyl isobutyl ketone, acetone, cyclohexanone and isophorone.
Claim 13
Independent Claim
211 words
A method for making a steel sheet having organic composite plating layer which comprises plating a steel sheet with zinc, aluminum or zinc base composite alloy, forming thereon an insoluble chromate film of 5% or less in content of water-soluble matter at a coverage of 10-150 mg/m 2 in terms of total chromium content, coating thereon in the form of a thin film a coating composition having the following composition at a thickness of 0.3-5 μm as a solid film and then baking the coating film: (A) a bisphenol type epoxy resin having terminal epoxy groups and having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more based on solid content in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid content in the epoxy resin of 1/10-20/10, (C) fumed silica having an average particle size of 0.1-100 mμ in an amount of 5-50% by weight based on solid content in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content of the coating composition being 10-50% by weight.
Claim 14
Independent Claim
211 words
A method for making a steel sheet having organic composite plating layer which comprises plating a steel sheet with zinc, aluminum or zinc base composite alloy, forming thereon an insoluble chromate film of 5% or less in content of water-soluble matter at a coverage of 10-150 mg/m 2 in terms of total chromium content, coating thereon in the form of a thin film a coating composition having the following composition at a thickness of 0.3-5 μm as a solid film and then baking the coating film: (A) a bisphenol type epoxy resin having terminal epoxy groups and having a number-average molecular weight of 300-100,000 in an amount of 30% by weight or more based on solid content in the coating composition, (B) at least one curing agent selected from the group consisting of a polyisocyanate compound and a block polyisocyanate compound at a weight ratio to solid content in the epoxy resin of 1/10-20/10, (C) fumed silica having an average particle size of 0.1-100 mμ in an amount of 5-50% by weight based on solid content in the coating composition, and (D) a ketone organic solvent in an amount of 40% by weight or more of the coating composition, and the solid content of the coating composition being 10-50% by weight.
References Cited (Backward Citations)
US4411964A
Cited
JPS59162278A
Cited
US4659394A
Cited
EP0149461A1
Cited
JPS60149786A
Cited
JPS61584A
Cited
US4756935A
Cited
US4775600A
Cited
JPH0650181A
Cited
JPH06123766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |