US4532159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash-rust protecting of ferrous substrate
Assignee: Avecia Ltd
•
Filing: 1981-03-11
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Granted: 1985-07-30
•
Expires: 2001-03-11
Abstract
Abstract In the protection of ferrous substrates by application of a water-based paint composition followed by drying at ambient temperature susceptibility to flash rusting is reduced by the use of a paint composition having pH in the range from 4.0 to 6.5.
Inventors
- 👤 David Caldwell
- 👤 David Miller
- 👤 John C. Padget
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:01
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A method of protecting a ferrous substrate by application of a coating having low susceptibility to flash-rusting which comprises (a) applying to the said substrate by brushing, spraying or roller a coating of a water-based paint composition consisting essentially of (i) an aqueous latex of a film-forming polymer consisting essentially of units derived from one or more mono-ethylenically unsaturated monomers containing a single vinyl or vinylidene group and (ii) a corrosion-inhibiting pigment, the pH of the composition being in the range of from 4.0 to 6.5; and (b) allowing the applied coating to dry at ambient temperature and without any subsequent baking or curing at elevated temperature.
Claim 2
Independent Claim
107 words
A method of protecting a ferrous substrate by application of a coating having low susceptibility to flash-rusting which comprises (a) applying to the said substrate by brushing, spraying or roller a coating of a water-based paint composition consisting essentially of (i) an aqueous latex of a film-forming polymer consisting essentially of units derived from one or more mono-ethylenically unsaturated monomers containing a single vinyl or vinylidene group and (ii) a corrosion-inhibiting pigment, the pH of the composition being in the range of from 4.0 to 6.5; and (b) allowing the applied coating to dry at ambient temperature and without any subsequent baking or curing at elevated temperature.
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein the pH is in the range from 4.0 to 5.5.
Claim 4
Dependent Claim
41 words
A method according to claim 1, wherein the film-forming polymer is a copolymer of (i) vinyl chloride, (ii) vinylidene chloride and (iii) one or more alkyl acrylates or alkyl methacrylates having from 1 to 12 carbon atoms in the alkyl group.
Claim 5
Dependent Claim
18 words
A method according to claim 1, wherein the corrosion-inhibiting pigment is a metal salt of an inorganic oxy-acid.
Claim 6
Dependent Claim
22 words
A method according to claim 4, wherein the metal of the salt is zinc, lead, magnesium, manganese, iron, calcium strontium or barium.
Claim 7
Dependent Claim
12 words
A method according to claim 1, wherein the corrosion-inhibiting pigment zinc phosphate.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the composition also contains corrosion-inhibiting anions introduced in the form of the corresponding acid or a water-soluble salt thereof.
Claim 9
Dependent Claim
16 words
A method according to claim 1, wherein the solids content is at least 25% by volume.
References Cited (Backward Citations)
CH212859A
Cited
GB826564A
Cited
US2873215A
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GB1099152A
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GB1253080A
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GB1450916A
Cited
US4103049A
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GB1494212A
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GB1562651A
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US4103050A
Cited
US4238535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |