US4720403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticorrosive coating compositions
Assignee: DeSoto Inc
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Filing: 1986-08-07
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Granted: 1988-01-19
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Expires: 2006-08-07
Abstract
Abstract A primer coating system is disclosed that is resistant to abrasion and corrosion and includes a basecoat or first layer comprising a resinous polyepoxide, an aminoplast, phenoplast or blocked isocyanate curing agent, an epoxy-phosphate, a chromium-containing pigment and a clay that has the capacity to fix phosphate. The system may further include an overcoat or second layer comprising a resinous polyhydric alcohol, a polyisocyanate, a chromium-containing pigment and the foregoing clay, and a third layer of a finish coating preferably based on a fluorine-containing polymer.
Inventors
- 👤 Kenneth E. Jasenof
- 👤 Ronald J. Lewarchik
- 👤 John Smyrniotis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:47
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; C; C08; C08G; C08G59/00; C08G59/14; C08G59/1405; C08G59/1422; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
104 words
A pigmented, corrosion and abrasion resistant, thermosetting organic solvent solution coating composition comprising: (a) from about 50 percent to about 85 percent of total resin solids of a resinous polyepoxide; (b) from about 10 percent to about 20 percent of total resin solids of an aminoplast, phenoplast or blocked isocyanate crosslinking agent for said polyepoxide; (c) from about 5 percent to about 30 percent of total resin solids of an epoxy-phosphate, said epoxy-phosphate being provided by reacting a resinous polyepoxide with at least 0.05 mole of orthophosphoric acid per equivalent of oxirane in said polyepoxide; and (d) a chromium-containing pigment providing resistance to corrosion.
Claim 2
Dependent Claim
104 words
A pigmented, corrosion and abrasion resistant, thermosetting organic solvent solution coating composition comprising: (a) from about 50 percent to about 85 percent of total resin solids of a resinous polyepoxide; (b) from about 10 percent to about 20 percent of total resin solids of an aminoplast, phenoplast or blocked isocyanate crosslinking agent for said polyepoxide; (c) from about 5 percent to about 30 percent of total resin solids of an epoxy-phosphate, said epoxy-phosphate being provided by reacting a resinous polyepoxide with at least 0.05 mole of orthophosphoric acid per equivalent of oxirane in said polyepoxide; and (d) a chromium-containing pigment providing resistance to corrosion.
Claim 3
Dependent Claim
16 words
The coating composition of claim 1 further including a clay having the capacity to fix phosphate.
Claim 4
Dependent Claim
36 words
The coating composition of claim 1 wherein said resinous polyepoxide is a diglycidyl ether of a bisphenol having a molecular weight of from about 500 to 10,000 and a 1,2-epoxy equivalency of at least about 1.3.
Claim 5
Dependent Claim
35 words
The coating composition of claim 1 wherein said resinous polyepoxide is a diglycidyl ether of a bisphenol having a molecular weight of at least about 2,000 and a 1,2-epoxy equivalency of at least about 1.7.
Claim 6
Dependent Claim
14 words
The coating composition of claim 1 wherein said crosslinking agent is a urea-formaldehyde condensate.
Claim 7
Dependent Claim
14 words
The coating composition of claim 1 wherein said crosslinking agent is a xylolol-formaldehyde condensate.
Claim 8
Dependent Claim
34 words
The coating composition of claim 2 wherein said epoxy-phosphate contains from 0.05 to 0.7 mole of phosphoric acid per oxirane equivalent in said polyepoxide, the balance of the oxirane functionality being consumed by hydrolysis.
Claim 9
Dependent Claim
29 words
The coating composition of claim 7 wherein said epoxy-phosphate dispersion comprises from about 10 percent to 20 percent of the total weight of the resin solids in the composition.
Claim 10
Dependent Claim
36 words
The coating composition of claim 1 wherein said chromium-containing pigment is present in a weight ratio with respect to the total weight of said polyepoxide and aminoplast or phenoplast crosslinking agent of about 0.1:1 to 0.6:1.
Claim 11
Dependent Claim
38 words
The coating composition of claim 8 wherein said chromium-containing pigment is present in a weight ratio with respect to the total weight of said polyepoxide and aminoplast, phenoplast or blocked isocyanate crosslinking agent of about 0.2:1 to 0.5:1.
Claim 12
Dependent Claim
14 words
The coating composition of claim 10 wherein said chromium-containing pigment is a chromate pigment.
Claim 13
Dependent Claim
24 words
The coating composition of claim 2 wherein said clay has an anion-exchange capacity of at least about 10 milliequivalents per 100 grams of clay.
Claim 14
Dependent Claim
37 words
The coating composition of claim 2 wherein said clay is present in a weight ratio with respect to the total weight of said polyepoxide and aminoplast, phenoplast or blocked isocyanate crosslinking agent of about 0.1:1 to 1:1.
Claim 15
Dependent Claim
37 words
The coating composition of claim 2 wherein said clay is present in a weight ratio with respect to the total weight of said polyepoxide and aminoplast, phenoplast or blocked isocyanate crosslinking agent of about 0.3:1 to 0.8:1.
Claim 16
Dependent Claim
83 words
A method of protecting a metal substrate comprising applying thereto the coating composition of claim 1 to form a first layer and then overcoating with a pigmented, corrosion and abrasion resistant, thermosetting organic solvent solution coating composition comprising (a) from about 20 to 90 percent by weight, based on the weight of resin solids, of a resinous polyhydric alcohol; (b) from about 10 to 80 percent of a polyisocyanate; and (c) a chromium-containing pigment providing resistance to corrosion to form a second layer.
Claim 17
Dependent Claim
12 words
The method of claim 15 wherein said polyisocyanate is a blocked isocyanate.
Claim 18
Dependent Claim
15 words
The method of claim 15 further including a clay having the ability to fix phosphate.
Claim 19
Dependent Claim
30 words
The method of claim 15 wherein said chromium-containing pigment is present in a weight ratio with respect to the total weight of said polyhydric alcohol of about 0.1:1 to 0.6:1.
Claim 20
Dependent Claim
30 words
The method of claim 15 wherein said chromium-containing pigment is present in a weight ratio with respect to the total weight of said polyhydric alcohol of about 0.2:1 to 0.5:1.
Claim 21
Dependent Claim
13 words
The method of claim 15 wherein said chromium-containing pigment is a chromate pigment.
Claim 22
Dependent Claim
24 words
The method of claim 17 further including a clay having an anion-exchange capacity of at least about 10 milliequivalents per 100 grams of clay.
Claim 23
Dependent Claim
23 words
The method of claim 15 in which the total thickness of the first layer and the second layer is least about 0.7 mils.
Claim 24
Dependent Claim
31 words
The method of claim 22 wherein the first layer has a thickness of at least about 0.1 mils and the second layer has a thickness of at least about 0.6 mils.
Claim 25
Dependent Claim
27 words
The method of claim 15 further including the steps of baking the coating compositions to thermoset the same, and applying a fluorine polymer-containing coating as a topcoat.
Claim 26
Dependent Claim
26 words
A method of claim 24 in which the total thickness of the first layer, the second layer and the topcoat is at least about 1.4 mils.
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) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |