US4758281A
Expired / Lapsed
US
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Anti-corrosive protective coatings
Assignee: International Minerals and Chemical Corp
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Filing: 1986-09-12
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Granted: 1988-07-19
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Expires: 2006-09-12
Abstract
Abstract An anti-corrosion coating and pigment therefore, the latter comprising the combination of condensed aluminum phosphate with a comminuted zeolite or silica and process for the preparation thereof.
Inventors
- 👤 Paul E. Eckler
- 👤 Louis W. Ferrara
- 👤 Larry A. Fellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:51
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/405; C09C1/0081; C09D; C09D5/00; C09D5/08; C09D5/082; C09D5/084; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/20; C01P2006/22; C01P2006/60; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
149 words
A corrosion inhibiting pigment produced by the process comprising the steps of (a) heating an aluminum source selected from the group consisting of aluminum hydroxide, aluminum oxide, and aluminum sulfate, with a phosphorous-containing compound selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid and mono-aluminum phosphate in a ratio of about 1:3.5-4.5 under water-removing conditions to a temperature within the range 105°-110° C. (b) adding a zeolite or silica in an amount of about 1.0 to 15 parts per part of the aluminum source, (c) heating to within about 120° to about 150° C. until the water content is within about 23-27%, (d) cooling the product thereby obtained to produce a solid, (e) communicating the product, (f) heating the communicated product to within about 275°-325° C. for from 4 to 6 hours under sealed conditions (g) cooling the product and comminuting same thereby producing the pigment.
Claim 2
Dependent Claim
149 words
A corrosion inhibiting pigment produced by the process comprising the steps of (a) heating an aluminum source selected from the group consisting of aluminum hydroxide, aluminum oxide, and aluminum sulfate, with a phosphorous-containing compound selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid and mono-aluminum phosphate in a ratio of about 1:3.5-4.5 under water-removing conditions to a temperature within the range 105°-110° C. (b) adding a zeolite or silica in an amount of about 1.0 to 15 parts per part of the aluminum source, (c) heating to within about 120° to about 150° C. until the water content is within about 23-27%, (d) cooling the product thereby obtained to produce a solid, (e) communicating the product, (f) heating the communicated product to within about 275°-325° C. for from 4 to 6 hours under sealed conditions (g) cooling the product and comminuting same thereby producing the pigment.
Claim 3
Dependent Claim
18 words
The pigment of claim 1 consisting essentially of the combination of a zeolite coated with aluminum dihydrogen tripolyphosphate.
Claim 4
Dependent Claim
16 words
The pigment of claim 1 consisting essentially of the combination of condensed aluminum phosphate with silica.
Claim 5
Dependent Claim
13 words
The pigment of claim 3 wherein the silica is provided by diatomaceous earth.
Claim 6
Dependent Claim
14 words
The pigment of claim 3 wherein the silica is provided by condensed silica fumes.
Claim 7
Dependent Claim
10 words
The pigment of claim 2 wherein the zeolite is clinoptilolite.
Claim 8
Dependent Claim
137 words
A process for the production of a corrosion-inhibiting pigment wherein a particle of comminuted zeolite is coated with a condensed, glassy aluminum phosphate comprising the steps of: (a) reacting an aluminum source selected from the group consisting of aluminum sulfate, aluminum hydroxide or aluminum oxide with a phosphorous-containing acid selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid or monoaluminum phosphate in a mole ratio of about 3:1 of P:Al, (b) heating under water-removing conditions to about 120° C., (c) adding a comminuted zeolite in an amount sufficient to provide a ratio of Si:P of about 1:1, (d) continuing heating at about 120° until the water content is within about 15-20%, (e) continuing heating at about 300° C. for a length of time sufficient to effect a glassy condensed aluminum phosphate coating on zeolite.
Claim 9
Dependent Claim
137 words
A process for the production of a corrosion-inhibiting pigment wherein a particle of comminuted zeolite is coated with a condensed, glassy aluminum phosphate comprising the steps of: (a) reacting an aluminum source selected from the group consisting of aluminum sulfate, aluminum hydroxide or aluminum oxide with a phosphorous-containing acid selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid or monoaluminum phosphate in a mole ratio of about 3:1 of P:Al, (b) heating under water-removing conditions to about 120° C., (c) adding a comminuted zeolite in an amount sufficient to provide a ratio of Si:P of about 1:1, (d) continuing heating at about 120° until the water content is within about 15-20%, (e) continuing heating at about 300° C. for a length of time sufficient to effect a glassy condensed aluminum phosphate coating on zeolite.
Claim 10
Dependent Claim
12 words
The pigment of claim 1 wherein the phosphorous-containing acid is orthophosphoric acid.
Claim 11
Dependent Claim
12 words
The process of claim 7 wherein the phosphorous-containing acid is orthophosphoric acid.
Claim 12
Dependent Claim
12 words
The process of claim 7 wherein the phosphorous-containing acid is pyrophosphoric acid.
Claim 13
Dependent Claim
12 words
The process of claim 7 wherein the phosphorous-containing acid is polyphosphoric acid.
Claim 14
Dependent Claim
12 words
The process of claim 7 wherein the phosphorous-containing acid is monoaluminum phosphate.
Claim 15
Dependent Claim
12 words
The process of claim 7 wherein the aluminum source is aluminum hydroxide.
Claim 16
Dependent Claim
12 words
The process of claim 7 wherein the aluminum source is aluminum oxide.
Claim 17
Dependent Claim
17 words
The process of claim 7 wherein the aluminum source is an aluminum salt of an inorganic acid.
Claim 18
Dependent Claim
12 words
The pigment of claim 1 wherein the zeolite is mordonite or clinoptilolite.
Claim 19
Dependent Claim
12 words
The pigment of claim 1 wherein the aluminum soure is aluminum hydroxide.
Claim 20
Dependent Claim
12 words
The pigment of claim 1 wherein the aluminum source is aluminum oxide.
Claim 21
Dependent Claim
12 words
The pigment of claim 1 wherein the aluminum source is aluminum sulfate.
Claim 22
Dependent Claim
16 words
The pigment of claim 1 wherein silica is added to the aluminum source in step (b).
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |