US3650783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trivalent metal phosphate coated colloidal silica molding powders
Assignee: EIDP Inc
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Filing: 1969-05-13
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Granted: 1972-03-21
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Expires: 1989-05-13
Abstract
Abstract Compositions having small particle sizes and containing (1) silica and (2) a trivalent metal phosphate and wherein the trivalent metal phosphate is distributed uniformly and homogeneously with respect to the silica, are useful as high temperature refractory binders, coatings, and adhesives and can be pressed to molded articles.
Inventors
- 👤 Paul C Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:25
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
47 words
a source of phosphate anions selected from the group consisting of a soluble ionic salt and phosphoric acid the proportion of (1) and (2) being such that for each molar portion of trivalent metal ion there is added from 0.5 mole to 1.5 moles of phosphate ions.
Claim 2
Dependent Claim
13 words
The composition of claim 1 wherein the particles are colloidally dispersed in water.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the particles are in the form of a dry powder.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the trivalent phosphate is boron phosphate.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the trivalent phosphate is aluminum phosphate.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein the trivalent phosphate is ferric phosphate.
Claim 7
Dependent Claim
12 words
The composition of claim 1 wherein the trivalent phosphate is chromic phosphate.
Claim 8
Independent Claim
108 words
A method for making a composition of matter consisting essentially of particles having a size in the range of from 3 millimicrons to 250 millimicrons and containing: A. 10 to 90%, by weight, of amorphous silica and B. 90 to 10%, by weight, of a trivalent phosphate selected from the group consisting of (i) boron phosphate, (ii) aluminum phosphate, (iii) ferric phosphate, and (iv) chromic phosphate, with the proviso that the trivalent phosphate is distributed uniformly and homogeneously with respect to the silica, forming a bonded coating thereon; said method comprising contacting a colloidal silica sol having from 5% to 30%, by weight, of SiO2 simultaneously with both:
Claim 9
Dependent Claim
23 words
The method of claim 8 wherein there is about one molar portion of phosphate anion for each molar portion of trivalent metal ion.
Claim 10
Dependent Claim
26 words
The process of claim 8 wherein the silica is contacted with (1) and (2) at a temperature within the range of 30* C. to 90* C.
Claim 11
Dependent Claim
10 words
The process of claim 8 wherein (1) is aluminum nitrate.
Claim 12
Dependent Claim
10 words
The process of claim 8 wherein (1) is boric acid.
Claim 13
Dependent Claim
10 words
The process of claim 8 wherein (1) is ferric nitrate.
Claim 14
Dependent Claim
10 words
The process of claim 8 wherein (1) is chromic nitrate.
Claim 15
Dependent Claim
10 words
The process of claim 8 wherein (2) is phosphoric acid.
Claim 16
Dependent Claim
76 words
A dense body containing 10 to 90%, by weight, of amorphous silica and 90 to 10%, by weight, of a trivalent phosphate selected from the group consisting of (i) boron phosphate, (ii) aluminum phosphate, (iii) ferric phosphate, and (iv) chromic phosphate, with the proviso that the trivalent phosphate is distributed uniformly and homogeneously with respect to the silica, forming a bonded coating thereon; said body having a density in excess of 95% of the theoretical density.
References Cited (Backward Citations)
US2649388A
Cited
US2995453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |