Patent US4881975A successfully refreshed from Google Patents.
US4881975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Products for treating surfaces
Assignee: Solvay Solutions UK Ltd
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Filing: 1987-12-21
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Granted: 1989-11-21
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Expires: 2007-12-21
Abstract
Abstract Silica products obtained from trivalent metal e.g. Al compounds and silica can be used as corrosion inhibitors or adhesion promoters for organic coatings on surfaces by way of no-rinse or phosphating treatment or as pigments.
Inventors
- 👤 John R. Collier
- 👤 Kenneth U. Holker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:14
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C09; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/084; C23C22/36; C23C22/48
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
77 words
A process for coating a surface which comprises applying thereto an acidic aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and dispersed silica with a silicon to trivalent metal atom ratio of 5.5-30;1, or a reaction product of said compound and silica, and drying said dispersion on the surface to leave a coated surface with a coating weight of 20-5000 mg/m 2 .
Claim 2
Dependent Claim
77 words
A process for coating a surface which comprises applying thereto an acidic aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and dispersed silica with a silicon to trivalent metal atom ratio of 5.5-30;1, or a reaction product of said compound and silica, and drying said dispersion on the surface to leave a coated surface with a coating weight of 20-5000 mg/m 2 .
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the silicon to trivalent metal atom ratio is 5.5-9.5:1 and the coating weight is 50-1000 mg/m 2 .
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the dispersion is dried at 50°-300° C.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein after drying of the dispersion, the surface is coated with an organic coating.
Claim 6
Dependent Claim
14 words
A process according to claim 1 wherein the surface is of aluminium or steel.
Claim 7
Dependent Claim
33 words
A process according to claim 1 wherein an aluminium surface is coated with an aqueous dispersion of aluminium acid phosphate and colloidal silica with an atom ratio of silicon to aluminium of 5.5-12:1.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the dispersion applied to the surface is at pH 1.5-2.5.
Claim 9
Dependent Claim
105 words
A process for coating a surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an inorganic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and silica of fine particle size, with a silicon to trivalent metal atom ratio of 5.5-30:1, or a reaction product of said compound and silica, said dispersion being substantially free of metals capable of valency of at least 5, and drying said dispersion on the surface to leave a coated surface.
Claim 10
Dependent Claim
105 words
A process for coating a surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an inorganic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and silica of fine particle size, with a silicon to trivalent metal atom ratio of 5.5-30:1, or a reaction product of said compound and silica, said dispersion being substantially free of metals capable of valency of at least 5, and drying said dispersion on the surface to leave a coated surface.
Claim 11
Dependent Claim
15 words
A process according to claim 8 wherein the silicon trivalent metal atom ratio is 5.5-9.5:1.
Claim 12
Dependent Claim
13 words
A process according to claim 8, in which the dispersion contains fluoride ions.
Claim 13
Dependent Claim
16 words
A process according to claim 1 wherein the silicon to trivalent metal atom ratio is 5.5-9.5:1.
Claim 14
Dependent Claim
135 words
A process for coating a metallic surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an organic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and silica of fine particle size, with a silicon to trivalent metal atom ratio of 5.5-9.5:1, or a reaction product of said compound and silica, and containing 0.1-10 g/l fluoride ions, said dispersion being substantially free of metals capable of valency of at least 5, said coating when dry having a weight of 50-1000 mg per square meter of the metallic surface, and drying said dispersion at a temperature of 50°-300° C. on the surface to leave a coated surface.
Claim 15
Dependent Claim
135 words
A process for coating a metallic surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an organic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of an acidic trivalent metal compound, in which the metal is iron or aluminium or a mixture thereof, and silica of fine particle size, with a silicon to trivalent metal atom ratio of 5.5-9.5:1, or a reaction product of said compound and silica, and containing 0.1-10 g/l fluoride ions, said dispersion being substantially free of metals capable of valency of at least 5, said coating when dry having a weight of 50-1000 mg per square meter of the metallic surface, and drying said dispersion at a temperature of 50°-300° C. on the surface to leave a coated surface.
Claim 16
Dependent Claim
113 words
A process for coating a metallic surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an organic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of aluminium acid phosphate and colloidal silica with a silicon to aluminium atom ratio of 5.5-9.5:1, or a reaction product thereof, and containing 0.1-10 g/l fluoride ions, said dispersion being substantially free of metals capable of valency of at least 5, said coating when dry having a weight of 50-1000 mg per square meter of the metallic surface, and drying said dispersion at a temperature of 50°-300° C. on the surface to leave a coated surface.
Claim 17
Dependent Claim
113 words
A process for coating a metallic surface by applying thereto an essentially inorganic coating suitable as a preparatory coating for subsequent application of an organic coating, said preparatory coating being applied from an aqueous dispersion consisting essentially of aluminium acid phosphate and colloidal silica with a silicon to aluminium atom ratio of 5.5-9.5:1, or a reaction product thereof, and containing 0.1-10 g/l fluoride ions, said dispersion being substantially free of metals capable of valency of at least 5, said coating when dry having a weight of 50-1000 mg per square meter of the metallic surface, and drying said dispersion at a temperature of 50°-300° C. on the surface to leave a coated surface.
Claim 18
Dependent Claim
16 words
A process according to claim 12 or 13 in which the metallic surface is of aluminium.
Claim 19
Dependent Claim
16 words
A process according to claim 12 or 13 in which the metallic surface is of steel.
Claim 20
Dependent Claim
27 words
A process according to claim 4, wherein the organic coating is applied from a paint containing a vehicle selected from alkyd resins, epoxy resins, and drying oils.
Claim 21
Dependent Claim
25 words
A process according to claim 4, wherein the organic coating is applied from a stoving paint curable at a temperature of at least 100° C.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |