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US3798046A
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Modified, precipitated alumino silicate pigments and an improved method for preparing same
Assignee: JM Huber Corp
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Filing: 1971-11-05
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Granted: 1974-03-19
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Expires: 1991-11-05
Abstract
Abstract Novel alkali aluminum silicate particulates modified with and containing a chemically bound alkaline earth metal, and a method for producing same is disclosed. The alumino silicate pigments contain an alkaline earth metal, preferably calcium, magnesium or barium in addition to an alkali metal, such as sodium. In chemical composition, the pigments contain oxides of the alkaline earth metal, the alkali metal, aluminum and silicon and are distinguishable from co-precipitates. The pigments are prepared by introducing dilute solutions of an alkali silicate and an aluminum salt of a mineral acid into an agitated aqueous receiving medium containing an alkaline earth salt or hydroxide. The pH of the fuild reaction medium may be controlled to form finely divided precipitated particulates having improved properties and which may be used as pigments in paper, paint, rubber, inks, plastics and the like.
Inventors
- 👤 R Fitton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/42; B; B82; B82Y; B82Y30/00; C01B33/26; C01B33/40; C01B33/46; C09; C09C; C09C1/00; C09C1/40; C09C1/405; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/11; C01P2006/12; C01P2006/19; C01P2006/60; C01P2006/80; C01P2006/82; C01P2006/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
The method in accordance with claim 1 wherein said dilute solutions of said alkali silicate and aluminum salt are introduced into said aqueous receiving medium at widely spaced points, and wherein said solutions of the alkali silicate and aluminum salt are not more than 1 molar concentration and said alkali silicate contains SiO2 and Na2O in a molar ratio of from about 1 to 3.3:1.
Claim 2
Dependent Claim
74 words
The method in accordance with claim 2 wherein the initial volume of said aqueous receiving medium is at least half the combined volume of said solutions of the alkali metal silicate and the aluminum salt and wherein said alkaline earth salt or hydroxide is present in said receiving medium in an amount such that the alkaline earth metal comprises from about 0.1 to 8.0 percent based on the dry weight of the precipitated particulate.
Claim 3
Dependent Claim
65 words
The method in accordance with claim 1 wherein the aqueous reaction mass is maintained at a pH in the range of about 8 to 12 while combining said solutions of the alkali silicate and the aluminum salt; said method further comprising reducing the pH of the fluid reaction medium to a pH of between about 8 to 9.5 at the end of the reaction period.
Claim 4
Dependent Claim
22 words
The method in accordance with claim 1 wherein the alkaline earth salt is a water soluble salt of calcium, magnesium or barium.
Claim 5
Dependent Claim
24 words
The method in accordance with claim 1 wherein said aluminum salt includes a finely divided precipitated silica suspended in an aqueous dilute solution thereof.
Claim 6
Independent Claim
232 words
A method for producing finely divided, precipitated alkaline earth alkali metal alumino-silicates having particular utility for use in paper, said method comprising the steps of introducing a dilute aqueous solution of an alkali silicate selected from the group consisting of sodium and potassium silicates into an agitated aqueous receiving medium containing an alkaline earth salt selected from the group consisting of the water soluble salts of magnesium, calcium and barium or mixtures thereof; continuing the addition of said alkali silicate to said receiving medium until the pH of said receiving medium is at least 8 and for a period of time to effect an initial reaction between said alkali silicate and said alkaline earth salt; introducing a dilute solution of a salt of aluminum and a mineral acid into said receiving medium while continuing the addition of said alkali silicate; said simultaneous addition of the alkali silicate and aluminum salt being controlled such that the pH of the fluid reaction medium is in the range of 8 to 12 to thereby produce in said medium very fine white precipitated particulates composed principally of oxides of said alkaline earth metal, said alkali metal, aluminum and silicon; adjusting the pH of the fluid reaction medium to between about 8 to 10, and separating, drying and disintegrating said precipitates to obtain a pigment having a particle size of not greater than 1 micron in diameter.
Claim 7
Dependent Claim
81 words
The method in accordance with claim 7 wherein said dilute solutions of the alkali silicate and aluminum salt are not more than 1 molar concentration and said alkali silicate contains SiO2 and Na2O in a molar ratio of from about 1 to 3.3:1, said method further comprising maintaining the concentration of said alkaline earth salt in said receiving medium such that the alkaline earth metal comprises from about 0.1 to 30.0 percent based on the dry weight of the precipitated particulate.
Claim 8
Dependent Claim
22 words
The method in accordance with claim 7 wherein said dilute solution of the aluminum salt includes finely divided precipitated silica suspended therein.
References Cited (Backward Citations)
US2739073A
Cited
US2848346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |