US4665050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-supporting structures containing immobilized inorganic sorbent particles and method for forming same
Assignee: Pall Corp
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Filing: 1984-08-13
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Granted: 1987-05-12
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Expires: 2004-08-13
Abstract
Abstract A self-supporting structure comprising an inorganic sorbent and method for preparing is described in which the self-supporting structure is substantially free of sorbent fines and the sorption characteristics of the sorbent particles is retained. The process for immobilizing the sorbent particles in the self-supporting structure comprises the steps of: (a) preheating inorganic sorbent particles to an elevated temperature; (b) mixing the sorbent particles with particles of a polymeric binding material to form a mixture comprising the particles of polymeric binding material adhered to the sorbent particles; and (c) heating the mixture to about the solid-liquid transition temperature of the polymeric binding material with or without pressure to form a structure which upon cooling is self supporting.
Inventors
- 👤 Peter J. Degen
- 👤 Thomas C. Gsell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:16
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/2803; B01J20/28002; B01J20/28004; B01J20/28026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A process for immobilizing inorganic sorbent particles with a polymeric, thermoplastic binding material, the process comprising: (a) preheating the inorganic sorbent particles, the major portion of which have particles sizes in the range of from about 1 to about 10 millimeters, to an elevated temperature; (b) mixing the heated sorbent particles with particles of the polymeric, thermoplastic binding material to form a mixture comprising from about 1 to about 7% polymeric, thermoplastic binding material based on the weight of the mixture, the particles of polymeric, thermoplastic binding material being adhered to the sorbent particles; and (c) heating the mixture to about the solid-liquid transition temperature of said polymeric, thermoplastic binding material with or without pressure, thereby forming a structure which, upon cooling, is self-supporting, in which the formation of sorbent fines is substantially eliminated and in which the sorption characteristics of the inorganic sorbent particles are substantially retained.
Claim 2
Dependent Claim
148 words
A process for immobilizing inorganic sorbent particles with a polymeric, thermoplastic binding material, the process comprising: (a) preheating the inorganic sorbent particles, the major portion of which have particles sizes in the range of from about 1 to about 10 millimeters, to an elevated temperature; (b) mixing the heated sorbent particles with particles of the polymeric, thermoplastic binding material to form a mixture comprising from about 1 to about 7% polymeric, thermoplastic binding material based on the weight of the mixture, the particles of polymeric, thermoplastic binding material being adhered to the sorbent particles; and (c) heating the mixture to about the solid-liquid transition temperature of said polymeric, thermoplastic binding material with or without pressure, thereby forming a structure which, upon cooling, is self-supporting, in which the formation of sorbent fines is substantially eliminated and in which the sorption characteristics of the inorganic sorbent particles are substantially retained.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the solid-liquid transition temperature is 50 to 90 degrees Fahrenheit above the Vicat softening point of the polymeric, thermoplastic binding material.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein a major portion of the particles of said polymeric, theremoplastic binding material has particles sizes in the range of about 8 to about 100 micrometers.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein pressure from about 0.3 to about 50 psi is applied in step (c).
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said polymeric, thermoplastic binding material comprises a polyolefin.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein said polyolefin comprises polyethylene.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said inorganic sorbent particles comprise alumina.
Claim 9
Dependent Claim
121 words
The process of claim 1 wherein said polymeric, thermoplastic binding material is low density polyethylene, a major portion of which has particle sizes in the range of about 8 to about 100 micrometers and is present in an amount of from about 2 to about 5% by weight, based on the weight of said mixture, said sorbent is heated to a temperature of from about 250 to about 280° Fahrenheit prior to mixing with said polymeric, thermoplastic binding material and a pressure of from about 0.3 to about 20 psi is applied to said mixture while said mixture is at a temperature of about 50 to about 90 degrees F. above the Vicat softening point of said polymeric, thermoplastic binding material.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |