Patent US3860692A successfully refreshed from Google Patents.
US3860692A
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Sodium aluminum borate
Assignee: US Borax Inc
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Filing: 1972-03-27
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Granted: 1975-01-14
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Expires: 1992-03-27
Abstract
Abstract Crystalline sodium aluminum borate which can be prepared by reaction of sodium tetraborate with aluminum hydroxide or aluminum salts in water at an elevated temperature. The product is useful as a fire-retardant for polyesters.
Inventors
- 👤 Nelson P Nies
- 👤 Richard W Hulbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
C; C01; C01B; C01B35/00; C01B35/06; C01B35/08; C01B35/10; C01B35/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
Crystalline hydrated sodium aluminum borate of the approximate formula 2Na2O.Al2O3.6B2O3.5H2O having the following principal lines in its X-ray diffraction pattern:
Claim 2
Independent Claim
56 words
The method for producing crystalline sodium aluminum borate of the approximate formula 2Na2O.Al2O3.6B2O3.13H2O which comprises reacting sodium tetraborate with a water-soluble aluminum salt or amorphous aluminum hydroxide in an aqueous medium at an elevated temperature of at least about 45*C., the boron to aluminum mole ratio in the reaction mixture being about 10:1 to about 40:1.
Claim 3
Dependent Claim
17 words
The method in accordance with claim 3 in which said elevated temperature is at least about 60*C.
Claim 4
Dependent Claim
54 words
The method in accordance with claim 3 in which an aqueous solution of sodium tetraborate containing at least 20% Na2B4O7 is reacted with aluminum sulfate at a temperature of at least about 60*C., the molar ratio of boron to aluminum in said reaction mixture being in the range of about 10:1 to about 40:1
Claim 5
Dependent Claim
41 words
The method in accordance with claim 3 in which said water-soluble aluminum salt is selected from the group consisting of aluminum sulfate, aluminum chloride, aluminum nitrate and sodium aluminate, boric acid also being present when said aluminum salt is sodium aluminate.
Claim 6
Dependent Claim
23 words
The method in accordance with claim 3 in which sodium tetraborate is reacted with amorphous aluminum hydroxide in the presence of boric aCid.
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |