US4621070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pillared interlayered clays and method of preparation
Assignee: Michigan State University
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Filing: 1985-12-02
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Granted: 1986-11-04
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Expires: 2005-12-02
Abstract
Abstract Imogolite-2:1 layered silicate clay complex comprising imogolite tubes intercalated between the layers of the host clay.
Inventors
- 👤 Thomas J. Pinnavaia
- 👤 Ivy D. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:50
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/049; B01J20/00; B01J20/02; B01J20/10; B01J20/16
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
71 words
A method of preparing a pillared, interlayered clay product in which a tubular structured aluminosilicate forms the pillars between the layers of the clay, comprising the steps of contacting an aqueous slurry of a clay selected from the group consisting of smectites, vermiculite, fluorohectorite, hydromicas, fluorotetrasilicic mica, fluorophlogopite, and related swelling 2:1 layered silicate clays with an aqueous solution of a tubular structured aluminosilicate and recovering the pillared interlayered clay product.
Claim 2
Independent Claim
71 words
A method of preparing a pillared, interlayered clay product in which a tubular structured aluminosilicate forms the pillars between the layers of the clay, comprising the steps of contacting an aqueous slurry of a clay selected from the group consisting of smectites, vermiculite, fluorohectorite, hydromicas, fluorotetrasilicic mica, fluorophlogopite, and related swelling 2:1 layered silicate clays with an aqueous solution of a tubular structured aluminosilicate and recovering the pillared interlayered clay product.
Claim 3
Dependent Claim
16 words
The method as set forth in claim 1 in which the tubular structured aluminosilicate is imogolite.
Claim 4
Dependent Claim
14 words
The method as set forth in claim 2 in which synthetic imogolite is used.
Claim 5
Dependent Claim
26 words
The method as set forth in claim 3 in which the imogolite solution is aged at temperatures in the range of about 90° to 100° C.
Claim 6
Dependent Claim
17 words
The method as set forth in claim 3 in which the clay product is washed and dried.
Claim 7
Dependent Claim
20 words
The method as set forth in claim 3 in which the clay is used in the Na + exchanged form.
Claim 8
Dependent Claim
15 words
The method as set forth in claim 3 in which the clay is a smectite.
Claim 9
Dependent Claim
29 words
A pillared clay selected from the group consisting of smectites, vermiculite, fluorohectorite, hydromicas, fluorotetrasilicic mica, fluorophlogopite, and related swelling 2:1 layered silicate clays, intercalated with a tubular structured aluminosilicate.
Claim 10
Dependent Claim
29 words
A pillared clay selected from the group consisting of smectites, vermiculite, fluorohectorite, hydromicas, fluorotetrasilicic mica, fluorophlogopite, and related swelling 2:1 layered silicate clays, intercalated with a tubular structured aluminosilicate.
Claim 11
Dependent Claim
29 words
A product as set forth in claim 8 in which the aluminosilicate is imogolite or a synthetic imogolite-like product with a tube diameter of about 23 to about 26Å.
Claim 12
Dependent Claim
27 words
A product as set forth in claim 9 which exhibits a basal spacing (d 001 ) in the range of about 35 to about 44 angstrom units.
Claim 13
Dependent Claim
34 words
A product as set forth in claim 9 which has been washed with water and which exhibits a basal spacing (d 001 ) in the range of about 30 to about 44 angstrom units.
Claim 14
Dependent Claim
31 words
A product as set forth in claim 9 in which the intercalated imogolite tubes are substantially present as bundles with an intertube spacing in the range about 26 to about 44Å.
Claim 15
Dependent Claim
22 words
A product as set forth in claim 9 in which the intercalated imogolite tubes are substantially dispersed in a molecular, tube-by-tube manner.
Claim 16
Dependent Claim
25 words
A product as set forth in claim 13 in which less than 5% of the tubes are in the form of non-intercalated bundles of tubes.
Claim 17
Dependent Claim
15 words
A product as set forth in claim 9 in which the clay is a smectite.
Claim 18
Dependent Claim
25 words
A product as set forth in claim 9 having a surface area in the range of about 55 to about 480 square meters per gram.
Claim 19
Dependent Claim
18 words
An imogolite-2:1 layered silicate clay complex in which the imogolite is intercalated between the layers of the clay.
Claim 20
Dependent Claim
18 words
An imogolite-2:1 layered silicate clay complex in which the imogolite is intercalated between the layers of the clay.
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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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |