US4331715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the corrosion resistance of conversion coated parts
Assignee: Occidental Chemical Corp
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Filing: 1981-01-02
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Granted: 1982-05-25
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Expires: 2001-01-02
Abstract
Abstract An aqueous based coating composition comprises a flow control agent, a water solubilized epoxy adduct of an epoxy compound and an amino-substituted aromatic carboxylic acid, and a curing agent. The coating composition is applied to conversion coated steel parts to provide an improved corrosion resistant organic coating thereon.
Inventors
- 👤 Stephen M. Wolpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:20
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/52; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
A process for improving corrosion resistance of conversion coated parts such as fasteners and the like comprising: (A) first dipping said conversion coated parts into a bath of an aqueous based coating composition comprising: (1) from about 4% to about 40% of a water solubilized epoxy adduct of an epoxy compound and an amino-substituted aromatic carboxylic acid; (2) a curing agent in an amount effective to cure said epoxy adduct; (3) from about 0.02% to about 3% of a flow control agent selected from the group consisting of silicones, fluorocarbons, nonionic wetting agents, anionic wetting agents, ethoxylated alkylated phenols and mixtures thereof; and (4) balance water; (B) spinning said parts to remove excess coating composition; (C) again carrying out step (A); (D) again carrying out step (B); (E) baking said parts to provide a cured coating composition thereon; and (F) applying an oil to said cured coating composition.
Claim 2
Dependent Claim
148 words
A process for improving corrosion resistance of conversion coated parts such as fasteners and the like comprising: (A) first dipping said conversion coated parts into a bath of an aqueous based coating composition comprising: (1) from about 4% to about 40% of a water solubilized epoxy adduct of an epoxy compound and an amino-substituted aromatic carboxylic acid; (2) a curing agent in an amount effective to cure said epoxy adduct; (3) from about 0.02% to about 3% of a flow control agent selected from the group consisting of silicones, fluorocarbons, nonionic wetting agents, anionic wetting agents, ethoxylated alkylated phenols and mixtures thereof; and (4) balance water; (B) spinning said parts to remove excess coating composition; (C) again carrying out step (A); (D) again carrying out step (B); (E) baking said parts to provide a cured coating composition thereon; and (F) applying an oil to said cured coating composition.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said parts are subjected to a prebake step after step (B).
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein said parts are subjected to a prebake step after step (D).
Claim 5
Dependent Claim
27 words
The process of claim 3 wherein step (E) is carried out by heating said parts in an environment of from about 310° F. to about 350° F.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein said composition comprises, in addition, from about 0.05% to about 6% of a slip agent.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein said composition comprises, in addition, a pigment.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein said amino-substituted aromatic carboxylic acid is paraaminobenzoic acid.
Claim 9
Dependent Claim
11 words
The process of claim 7 wherein said curing agent is hexamethoxymethylmelamine.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein said composition comprises from about 5% to about 41% nonvolatiles.
Claim 11
Dependent Claim
18 words
The process of claim 9 wherein said composition comprises from about 15% to about 33% of said adduct.
Claim 12
Dependent Claim
13 words
The process of claim 10 wherein said flow control agent is a silicone.
Claim 13
Dependent Claim
15 words
The process of claim 11 wherein said slip agent is an aqueous dispersion of polyethylene.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |