US4073759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protecting rusty metal
Assignee: Roadway International Corp
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Filing: 1976-06-03
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Granted: 1978-02-14
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Expires: 1996-06-03
Abstract
Abstract Rust or corroded metal is very effectively protected by a coating deposited from an emulsion of asphalt, acrylic resin and rubber containing a polyamine surface active agent. No sand blasting, pickling, preparatory coating or other extensive preparatory treatment of the rusty or corroded metal is needed. Uncorroded metal is also protected by the coating.
Inventors
- 👤 James M. Lowry
- 👤 David Azar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:41
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/12; C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08L; C08L21/00; C08L21/02; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L95/00; C08L95/005; C09; C09D; C09D195/00; C09D195/005; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31717
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A process for protecting corrodible metal against corrosion, which processs comprises applying to the metal a layer of an emulsion of asphalt and rubber in water, the emulsion containing at least about 1/2% of a polyamine surface active agent based on the weight of the dry asphalt, about 2 to about 5% dispersed rubber based on the weight of the dry asphalt and about 20% of a dispersed acrylate resin based on the weight of the dry asphalt, the surface active agent being an N-alkyl alkylene diamine in which the alkyl is 12 to 30 carbons long and the two amine groups have from one to three carbon atoms separating them.
Claim 2
Dependent Claim
111 words
A process for protecting corrodible metal against corrosion, which processs comprises applying to the metal a layer of an emulsion of asphalt and rubber in water, the emulsion containing at least about 1/2% of a polyamine surface active agent based on the weight of the dry asphalt, about 2 to about 5% dispersed rubber based on the weight of the dry asphalt and about 20% of a dispersed acrylate resin based on the weight of the dry asphalt, the surface active agent being an N-alkyl alkylene diamine in which the alkyl is 12 to 30 carbons long and the two amine groups have from one to three carbon atoms separating them.
Claim 3
Dependent Claim
14 words
The combination of claim 1 in which the acrylic resin is a polybutyl acrylate.
Claim 4
Dependent Claim
27 words
The combination of claim 1 in which the emulsion also contains phosphoric acid in an amount about 0.1 to about 3% by weight of the dry asphalt.
Claim 5
Dependent Claim
13 words
The combination of claim 1 in which the rubber is a styrene-butadiene rubber.
Claim 6
Dependent Claim
56 words
The combination of claim 1 in which the emulsion is cationic, the asphalt has a penetration of 60 to 90, the polyamine surface active agent has a concentration of about 0.6 to about 1% based on the weight of the dry asphalt, the rubber is a synthetic rubber and the acrylic resin is a polybutyl acrylate.
Claim 7
Dependent Claim
15 words
The combination of claim 1 in which the metal surface is a rusty ferrous surface.
Claim 8
Dependent Claim
25 words
The combination of claim 6 in which the application of the layer to the rusty surface is made while that surface is wet with water.
Claim 9
Dependent Claim
17 words
The combination of claim 6 in which the rusty surface is not specially prepared for the coating.
Claim 10
Dependent Claim
19 words
The combination of claim 1 in which the layer is dried and a top coating is applied over it.
Claim 11
Dependent Claim
32 words
The combination of claim 9 in which the asphalt layer is dusted with an inert dust before it is tack-free and the top coating is applied by walking on the dusted coating.
Claim 12
Dependent Claim
16 words
The combination of claim 1 in which the N-alkyl alkylene diamine is an N-alkyl trimethylene diamine.
Claim 13
Dependent Claim
112 words
A composition for protecting corroded metals against additional corrosion, said composition being essentially a cationic emulsion of asphalt, an acrylate resin, and synthetic rubber in water, the emulsion containing at least about 1/2% of a polyamine surface active agent based on the weight of the dry asphalt, said agent being an N-alkyl alkylene diamine in which the alkyl is 12 to 30 carbons long and the two amine groups have from one to three carbon atoms separating them, the rubber content of the emulsion being between about 2 to about 5% of the weight of the dry asphalt and acrylate resin content being about 20% of the weight of the dry asphalt.
Claim 14
Dependent Claim
112 words
A composition for protecting corroded metals against additional corrosion, said composition being essentially a cationic emulsion of asphalt, an acrylate resin, and synthetic rubber in water, the emulsion containing at least about 1/2% of a polyamine surface active agent based on the weight of the dry asphalt, said agent being an N-alkyl alkylene diamine in which the alkyl is 12 to 30 carbons long and the two amine groups have from one to three carbon atoms separating them, the rubber content of the emulsion being between about 2 to about 5% of the weight of the dry asphalt and acrylate resin content being about 20% of the weight of the dry asphalt.
Claim 15
Dependent Claim
27 words
The combination of claim 12 in which the emulsion also contains phosphoric acid in an amount about 0.1 to about 3% by weight of the dry asphalt.
Claim 16
Dependent Claim
31 words
The combination of claim 12 in which the emulsion has its viscosity increased by a thickener that permits the application of coating layers up to 15 mils thick of the emulsion.
Claim 17
Dependent Claim
10 words
Rusty metals covered with the dried composition of claim 13.
Claim 18
Dependent Claim
16 words
The combination of claim 12 in which the N-alkyl alkylene diamine is an N-alkyl trimethylene diamine.
References Cited (Backward Citations)
US3549579A
Cited
US3497371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |