US4505748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-corrosive paint
Assignee: International Paint Ltd
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Filing: 1983-05-31
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Granted: 1985-03-19
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Expires: 2003-05-31
Abstract
Abstract An anti-corrosive coating composition includes an anti-corrosive pigment component comprising (a) a salt comprising a polyvalent metal cation and an organic polyphosphonic acid containing at least 2 phosphonic acid groups and (b) a corrosion passivator capable of modifying the metal oxide film on the metal to be protected to render it more protective. The ratio of the polyphosphonate salt (a) to the passivator (b) in the coating composition is 1:1 to 50:1 by weight.
Inventors
- 👤 Kenneth F. Baxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/086
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
137 words
An anti-corrosive coating composition for a metal substrate comprising a pigment component dispersed in a film-forming binder, in which the pigment component comprises (a) a salt comprising a polyvalent metal cation and an organic polyphosphonic acid containing at least two phosphonic acid groups and (b) a corrosion passivator capable of modifying the metal oxide film on the metal substrate to be protected to render it more protective, in which both the polyphosphonate salt (a) and the corrosion passivator (b) have a solubility of less than two grams per liter and the ratio of the polyphosphonate salt (a) to the passivator (b) is 1:1 to 50:1 by weight, and the film-forming binder is selected from a group consisting of alkyd resin, epoxy resin, oleoresin, chlorinated rubber, vinyl resin, polyurethane, polyester, organic silicate, inorganic silicate, polyamide and acrylic polymer.
Claim 2
Dependent Claim
137 words
An anti-corrosive coating composition for a metal substrate comprising a pigment component dispersed in a film-forming binder, in which the pigment component comprises (a) a salt comprising a polyvalent metal cation and an organic polyphosphonic acid containing at least two phosphonic acid groups and (b) a corrosion passivator capable of modifying the metal oxide film on the metal substrate to be protected to render it more protective, in which both the polyphosphonate salt (a) and the corrosion passivator (b) have a solubility of less than two grams per liter and the ratio of the polyphosphonate salt (a) to the passivator (b) is 1:1 to 50:1 by weight, and the film-forming binder is selected from a group consisting of alkyd resin, epoxy resin, oleoresin, chlorinated rubber, vinyl resin, polyurethane, polyester, organic silicate, inorganic silicate, polyamide and acrylic polymer.
Claim 3
Dependent Claim
91 words
An anti-corrosive coating composition according to claim 1 in which the polyphosphonate salt has the general formula M x R(PO 3 ) m H.sub.(2m-xn), where M represents a metal ion selected from zinc, manganese, magnesium, calcium, barium, aluminium, cobalt, iron, strontium, tin, zirconium, nickel, cadmium and titanium, R represents an organic radical linked to the phosphonate groups by carbon-phosphorus bonds, m is the valency of the radical R and is at least 2, n is the valency of the metal ion M and x is from 0.8 m/n to 2 m/n.
Claim 4
Dependent Claim
31 words
An anti-corrosive coating composition according to claim 2 in which the polyphosphonate salt is a salt of a diphosphonic acid of the formula: ##STR6## where R' is a monovalent organic radical.
Claim 5
Dependent Claim
19 words
An anti-corrosive coating composition according to claim 3 in which the polyphosphonate salt is a salt of etidronic acid.
Claim 6
Dependent Claim
27 words
An anti-corrosive coating composition according to claim 2 in which the polyphosphonate salt is a salt of an amino compound containing at least two N-methylenephosphonic acid groups.
Claim 7
Dependent Claim
17 words
An anti-corrosive coating composition according to claim 1 in which the polyphosphonate salt is a calcium salt.
Claim 8
Dependent Claim
22 words
An anti-corrosive coating composition according to claim 6 in which the molar ratio of calcium to phosphonate groups is 0.4:1 to 0.6:1.
Claim 9
Dependent Claim
38 words
An anti-corrosive coating composition according to claim 7 in which the polyphosphonate salt is a calcium etidronate having a molar ratio of calcium to etidronate groups of about 1:1 and being predominantly in the form of plate-like crystals.
Claim 10
Dependent Claim
17 words
An anti-corrosive coating composition according to claim 1 in which the polyphosphonate salt is a zinc salt.
Claim 11
Dependent Claim
17 words
An anti-corrosive coating composition according to claim 1 in which the polyphosphonate salt is a manganese salt.
Claim 12
Dependent Claim
62 words
An anti-corrosive coating composition according to claim 1 in which the polyphosphonate salt has the general formula: M.sub.x M'.sub.y R(PO.sub.3).sub.m H.sub.(2m-xn-y) where M, R, n, m and x are all as defined in claim 2, M' is an alkali metal ion or an ammonium or substituted ammonium ion, and the value of y is such that (xn+y) is from m to 2m.
Claim 13
Dependent Claim
29 words
An anti-corrosive coating composition according to claim 1 in which the passivator is a molybdate, tungstate, vanadate, stannate, manganate, titanate, phosphomolybdate or phosphovanadate containing cations from a divalent metal.
Claim 14
Dependent Claim
21 words
An anti-corrosive coating composition according to claim 12 in which the passivator also contains alkali metal, ammonium or substituted ammonium cation.
Claim 15
Dependent Claim
15 words
An anti-corrosive coating composition according to claim 1 in which the passivator is a molybdate.
Claim 16
Dependent Claim
16 words
An anti-corrosive coating composition according to claim 14 in which the passivator is sodium zinc molybdate.
Claim 17
Dependent Claim
15 words
An anti-corrosive coating composition according to claim 14 in which the passivator is zinc molybdate.
Claim 18
Dependent Claim
37 words
An anti-corrosive coating composition according to claim 14 in which the passivator is in the form of composite particles formed by precipitating a molybdate of a polyvalent metal on the surface of particles of a carrier pigment.
Claim 19
Dependent Claim
15 words
An anti-corrosive coating composition according to claim 1 in which the passivator is a vanadate.
Claim 20
Dependent Claim
25 words
An anti-corrosive coating composition according to claim 1 in which the ratio of the polyphosphonate salt to the passivator is 4:1 to 10:1 by weight.
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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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |