US4501615A
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: 1985-02-26
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Expires: 2003-05-31
Abstract
Abstract An anti-corrosive coating composition includes as an anti-corrosive pigment dispersed in a film-forming binder a salt of a polyvalent metal cation and an organic polyphosphonic acid containing at least 2 phosphonic acid groups. The ratio of polyvalent metal cations to phosphonate groups in the salt is at least 0.8/n:1, where n is the valency of the polyvalent metal ion.
Inventors
- 👤 Frank Reeder
- 👤 Michael J. Nunn
- 👤 Michael J. Mitchell
- 👤 Kenneth F. Baxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:25
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/086
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
An anti-corrosive coating composition comprising a pigment component dispersed in a film-forming binder, in which the pigment component comprises a salt of an organic polyphosphonic acid containing at least two phosphonic acid groups and a polyvalent metal cation selected from the group consisting of zinc, manganese, magnesium, calcium, barium, aluminum, cobalt, iron, strontium, tin, zirconium, nickel, cadmium and titanium, the molar ratio of polyvalent metal cations to phosphonate groups in the salt being at least 0.8/n:l, where n is the valency of the metal cation, and the aqueous solubility of the polyphosphonate salt being 0.1-2 grams per liter, and the film-forming binder is selected from a group consisting of alkyd resin, epoxy resin, oleoresin, chlorinated rubber, polyvinyl butyral, polyurethane, polyester, organic silicate, inorganic silicate, polyamide and acrylic polymer.
Claim 2
Dependent Claim
128 words
An anti-corrosive coating composition comprising a pigment component dispersed in a film-forming binder, in which the pigment component comprises a salt of an organic polyphosphonic acid containing at least two phosphonic acid groups and a polyvalent metal cation selected from the group consisting of zinc, manganese, magnesium, calcium, barium, aluminum, cobalt, iron, strontium, tin, zirconium, nickel, cadmium and titanium, the molar ratio of polyvalent metal cations to phosphonate groups in the salt being at least 0.8/n:l, where n is the valency of the metal cation, and the aqueous solubility of the polyphosphonate salt being 0.1-2 grams per liter, and the film-forming binder is selected from a group consisting of alkyd resin, epoxy resin, oleoresin, chlorinated rubber, polyvinyl butyral, polyurethane, polyester, organic silicate, inorganic silicate, polyamide and acrylic polymer.
Claim 3
Dependent Claim
73 words
An anti-corrosive coating composition according to claim 1 in which the salt is of the general formula M x R(PO 3 ) m H.sub.(2m-xn), where M represents the said metal cation, 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 0.8m/n to 2m/n.
Claim 4
Dependent Claim
30 words
An anti-corrosive coating composition according to claim 2 in which the salt is a salt of a diphosphonic acid of the formula: ##STR6## where R' is a monovalent organic radical.
Claim 5
Dependent Claim
18 words
An anti-corrosive coating composition according to claim 3 in which the salt is a salt of etidronic acid.
Claim 6
Dependent Claim
26 words
An anti-corrosive coating composition according to claim 2 in which the salt is a salt of an amino compound containing at least two N-methylene-phosphonic acid groups.
Claim 7
Dependent Claim
15 words
An anti-corrosive composition according to claim 1 in which the salt is a zinc salt.
Claim 8
Dependent Claim
16 words
An anti-corrosive coating composition according to claim 1 in which the salt is a manganese salt.
Claim 9
Dependent Claim
16 words
An anti-corrosive coating composition according to claim 1 in which the salt is a calcium salt.
Claim 10
Dependent Claim
37 words
An anti-corrosive coating composition according to claim 8 in which the 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 11
Dependent Claim
62 words
An anti-corrosive coating composition according to claim 1 in which the salt is of 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 12
Dependent Claim
16 words
An anti-corrosive coating composition according to claim 1 in which the salt is an overbased salt.
Claim 13
Dependent Claim
30 words
An anti-corrosive coating composition according to claim 11 in which the salt is a zinc etidronate having a molar ratio of zinc to etidronate groups of from 2:1 to 3:1.
Claim 14
Dependent Claim
34 words
An anti-corrosive coating composition according to claim 1 in which the salt is in the form of composite particles formed by precipitating the polyphosphonate salt on the surface of particles of a metal oxide.
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |