US4086182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rust transforming composition
Assignee: Noverox AG
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Filing: 1976-11-23
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Granted: 1978-04-25
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Expires: 1996-11-23
Abstract
Abstract A surface film of oxide on iron or steel is converted to a corrosion-resistant film by treatment with a composition comprising an aqueous dispersion or emulsion of a synthetic binding agent and a complexing agent for the iron which is a polymeric esterification product of an aromatic oxycarboxylic acid containing phenolic groups and a substance selected from the group consisting of acid anhydrides and substituted acid anhydrides. Advantageously the composition further comprises a solution of a synthetic plastics material.
Inventors
- 👤 Erich Hengelhaupt
- 👤 Lothar Peier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:54
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D183/00; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
69 words
A composition for converting a surface film of iron oxide on an iron body into a corrosion resistant film containing complexed compounds of iron, said composition comprising an aqueous dispersion or emulsion of a synthetic binding agent together with at least one polymeric esterification product of an aromatic oxycarboxylic acid having phenolic hydroxyl groups with a substance selected from the group consisting of acid anhydrides and substituted acid anhydrides.
Claim 2
Dependent Claim
69 words
A composition for converting a surface film of iron oxide on an iron body into a corrosion resistant film containing complexed compounds of iron, said composition comprising an aqueous dispersion or emulsion of a synthetic binding agent together with at least one polymeric esterification product of an aromatic oxycarboxylic acid having phenolic hydroxyl groups with a substance selected from the group consisting of acid anhydrides and substituted acid anhydrides.
Claim 3
Dependent Claim
14 words
The composition of claim 1, further comprising a solution of a synthetic plastics material.
Claim 4
Dependent Claim
34 words
The composition of claim 2, wherein the ratio of the amounts of said synthetic binding agent and said synthetic plastics material present in said composition is from 1.5 : 1 to 1 : 1.5.
Claim 5
Dependent Claim
19 words
The compositon of claim 1, wherein said polymeric esterification product is at least partially soluble or dispersible in water.
Claim 6
Dependent Claim
21 words
The composition of claim 1, wherein said polymeric esterification product is an esterification product of said oxycarboxylic acid with maleic anhydride.
Claim 7
Dependent Claim
21 words
The composition of claim 1, wherein said polymeric esterification product is an esterification product of said oxycarboxylic acid with phthalic anhydride.
Claim 8
Dependent Claim
23 words
The composition of claim 1, wherein said polymeric esterification product is an esterification product of said oxycarboxylic acid with a styrene-maleic anhydride copolymer.
Claim 9
Dependent Claim
25 words
The composition of claim 1, wherein said polymeric esterification product is an esterification product of said oxycarboxylic acid with a methyl vinyl ether-maleic anhydride copolymer.
Claim 10
Dependent Claim
43 words
The composition of claim 1, wherein said polymeric esterification product is an esterification product of an oxycarboxylic acid selected from the group consisting of gallic acid and tannin with a substance selected from the group consisting of acid anhydrides and substituted acid anhydrides.
Claim 11
Dependent Claim
18 words
The composition of claim 1, further comprising a benzene derivative containing from 2 to 3 phenolic hydroxyl groups.
Claim 12
Dependent Claim
14 words
The composition of claim 3, wherein said synthetic plastics material is an acrylic resin.
Claim 13
Dependent Claim
17 words
The composition of claim 3, wherein the synthetic plastics material is in solution in an aromatic hydrocarbon.
Claim 14
Dependent Claim
19 words
The composition of claim 3, wherein the solution of the synthetic plastics material further comprises a corrosion protective oil.
Claim 15
Dependent Claim
13 words
The composition of claim 1, having a pH of from 2.5 to 4.5.
Claim 16
Independent Claim
80 words
A method of converting a surface film of oxide on an iron or steel body to a corrosion-resistant protective coating which comprises applying to the surface of said body a composition comprising at least one polymeric esterification product of an oxycarboxylic acid having phenolic hydroxyl groups with a substance selected from the group consisting of acid anhydride and substituted acid anhydrides, said polymeric esterification product being dissolved or dispersed in an aqueous dispersion or emulsion of a synthetic binding agent.
Claim 17
Independent Claim
80 words
A method of converting a surface film of oxide on an iron or steel body to a corrosion-resistant protective coating which comprises applying to the surface of said body a composition comprising at least one polymeric esterification product of an oxycarboxylic acid having phenolic hydroxyl groups with a substance selected from the group consisting of acid anhydride and substituted acid anhydrides, said polymeric esterification product being dissolved or dispersed in an aqueous dispersion or emulsion of a synthetic binding agent.
Claim 18
Dependent Claim
40 words
The method of claim 15, wherein said composition applied to said surface additionally comprises a solution of a synthetic plastics material in a water-immiscible solvent, said solution being dispersed in said aqueous dispersion or emulsion of said synthetic binding agent.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |