US4609406A
Expired / Lapsed
US
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Rust conversion coatings
Assignee: Pennzoil Quaker State Co
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Filing: 1984-09-05
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Granted: 1986-09-02
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Expires: 2004-09-05
Abstract
Abstract A rust conversion composition comprises the reaction product of a polyhydroxybenzoic acid and a alkane polyol, in admixture with a film forming polymer, and water. The composition is applied to rusted, iron-containing surface, and allowed to dry to form a hard, moisture and corrosion resistant film. Alternatively, the film may be removed to produce an iron-containing surface free of rust.
Inventors
- 👤 Arpad M. Magyar
- 👤 James G. Newsome
- 👤 Darrell W. Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:41
CPC Classifications
C; C23; C23C; C23C22/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
54 words
A rust conversion coating comprising: (a) the previously formed ester and ether reaction products formed by the reaction of an excess of an alkane polyol with a polyhydroxybenzoic acid wherein water of condensation is removed as the ester and ether products are formed during the reaction; (b) a film forming polymer; and (c) water.
Claim 2
Dependent Claim
54 words
A rust conversion coating comprising: (a) the previously formed ester and ether reaction products formed by the reaction of an excess of an alkane polyol with a polyhydroxybenzoic acid wherein water of condensation is removed as the ester and ether products are formed during the reaction; (b) a film forming polymer; and (c) water.
Claim 3
Dependent Claim
24 words
A rust conversion coating according to claim 1 wherein the alkane polyol contains up to 7 carbon atoms and 2 to 3 hydroxyl groups.
Claim 4
Dependent Claim
28 words
A rust conversion coating according to claim 1 wherein the polyhydroxy benzoic acid is of the following formula: ##STR3## wherein n is an integer of 2 to 5.
Claim 5
Dependent Claim
15 words
A rust conversion coating according to claim 3 wherein the polyhydroxybenzoic acid is gallic acid.
Claim 6
Dependent Claim
15 words
A rust conversion coating according to claim 2 wherein the alkane polyol is ethylene glycol.
Claim 7
Dependent Claim
17 words
A rust conversion coating according to claim 1 wherein the film forming polymer is a polyacrylate polymer.
Claim 8
Dependent Claim
25 words
A rust converting composition comprising 5-10 wt.% of a reaction product of polyhydroxybenzoic acid and alkylene glycol, a film forming polymer, and the balance water.
Claim 9
Dependent Claim
25 words
A rust converting composition comprising 5-10 wt.% of a reaction product of polyhydroxybenzoic acid and alkylene glycol, a film forming polymer, and the balance water.
Claim 10
Dependent Claim
67 words
A method of preparing the composition of claim 1 wherein an excess of an alkane polyol is reacted with a polyhydroxybenzoic acid in the presence of an aromatic solvent and an acidic catalyst, the waters of condensation produced thereby are removed, the aromatic solvent and unreacted alkane polyol are removed by vacuum distillation, and the resulting reaction product is mixed with water and a film forming polymer.
Claim 11
Dependent Claim
12 words
A method according to claim 8 wherein the organic solvent is xylene.
Claim 12
Dependent Claim
13 words
A method according to claim 8 wherein the polyhydroxybenzoic acid is gallic acid.
Claim 13
Dependent Claim
13 words
A method according to claim 8 wherein the alkane polyol is ethylene glycol.
Claim 14
Dependent Claim
14 words
A method according to claim 8 wherein the film forming polymer is a polyacrylate.
Claim 15
Dependent Claim
35 words
A method of removing rust from rusted, iron-containing surfaces which comprises applying to the rusted surface a coating comprising the composition of claim 1, and permitting the coating to dry to a hard film surface.
Claim 16
Dependent Claim
20 words
A method according to claim 13 wherein the hard film surface is subsequently removed, leaving a rust-free iron containing surface.
Claim 17
Dependent Claim
48 words
A rust conversion coating according to claim 1 wherein the reaction product of the alkane polyol and polyhydroxy benzoic acid comprises esters formed by reaction between the benzoic acid portion and alcohol portion of the polyol, and ethers formed by reaction of the hydroxy substituents with subsequent polymerization.
Claim 18
Dependent Claim
40 words
A rust conversion coating according to claim 15 wherein the chemical structure of the reaction product is as follows: ##STR4## where m is an integer of 1 to 5, and n, p and q are integers of 5 or less.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |