US4130512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange materials
Assignee: National Research Development Corp UK
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Filing: 1976-02-19
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Granted: 1978-12-19
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Expires: 1996-02-19
Abstract
Abstract A process for the production of a particulate ion exchange material which comprises heating an inorganic material to produce a porous inert inorganic substrate, adsorbing an organic monomer into the substrate and polymerizing the adsorbed monomer so that the resultant polymer is retained within the pores of the substrate, and, if necessary, introducing ion exchange functional groups into the polymer.
Inventors
- 👤 Michael Streat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/44; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/17; B01J41/00; B01J41/08; B01J41/09; B01J47/00; B01J47/018
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
92 words
A process for the production of a particulate ion exchange material of increased resistance to acid and alkali attack which comprises heating a particulate inorganic material selected from the group consisting of inorganic oxide gels and inorganic silicates, to a temperature of from 100° to 550° C. to produce a porous inert inorganic substrate, adsorbing an ethylenically unsaturated organic monomer into the substrate and polymerising the adsorbed monomer so that the resultant polymer is retained within the pores of the substrate, and, if necessary, introducing ion exchange functional groups into the polymer.
Claim 2
Dependent Claim
92 words
A process for the production of a particulate ion exchange material of increased resistance to acid and alkali attack which comprises heating a particulate inorganic material selected from the group consisting of inorganic oxide gels and inorganic silicates, to a temperature of from 100° to 550° C. to produce a porous inert inorganic substrate, adsorbing an ethylenically unsaturated organic monomer into the substrate and polymerising the adsorbed monomer so that the resultant polymer is retained within the pores of the substrate, and, if necessary, introducing ion exchange functional groups into the polymer.
Claim 3
Dependent Claim
18 words
A process according to claim 1, in which the inorganic material is stannic oxide gel or silica gel.
Claim 4
Dependent Claim
22 words
A process according to claim 1, in which the inorganic material is heated to a temperature of from 300° to 450° C.
Claim 5
Dependent Claim
22 words
A process according to claim 3, in which the inorganic material is heated for a period of from 4 to 24 hours.
Claim 6
Dependent Claim
21 words
A process according to claim 1, in which the particle size of the inorganic material is from 0.005 to 0.10 cm.
Claim 7
Dependent Claim
37 words
A process according to claim 1, in which the organic monomer is such that the molecular size of the monomer unit is less than the average diameter of the pore opening of the porous inert inorganic substrate.
Claim 8
Dependent Claim
32 words
A process according to claim 1, in which the organic monomer is acrylic acid, an acrylic ester, styrene, a sulphonated styrene, vinyl pyridine, a substituted vinyl pyridine, acrylamide, or a vinyl amine.
Claim 9
Dependent Claim
19 words
A process according to claim 1, in which the monomer is polymerised in the presence of a cross-linking agent.
Claim 10
Dependent Claim
39 words
A process according to claim 1, in which the particles of porous inert inorganic substrate are soaked in the monomer, or in which the monomer is distilled on to the particles of substrate and adsorbed from the vapour phase.
Claim 11
Dependent Claim
29 words
A process according to claim 1, in which prior to the adsorption the porous inert inorganic substrate is first evacuated to remove water vapour and flushed with oxygen-free nitrogen.
Claim 12
Dependent Claim
32 words
A process according to claim 1, in which the polymerisation is chemically initiated by heating in the presence of a radical initiator, or initiated using ultraviolet light, gamma radiation, or x-ray initiation.
Claim 13
Dependent Claim
83 words
An ion-exchange material of increased resistance to acid and alkali attack having a relatively high specific gravity prepared by heating an inorganic material selected from the group consisting of inorganic oxide gels and inorganic silicates, to a temperature of from 100° C. to about 550° C., to form a porous, inert inorganic substrate, adsorbing an ethylenically unsaturated organic monomer into the porous inorganic substrate and subsequently polymerising the monomer within the pores of the substrate so that the resultant polymer is retained therein.
Claim 14
Dependent Claim
83 words
An ion-exchange material of increased resistance to acid and alkali attack having a relatively high specific gravity prepared by heating an inorganic material selected from the group consisting of inorganic oxide gels and inorganic silicates, to a temperature of from 100° C. to about 550° C., to form a porous, inert inorganic substrate, adsorbing an ethylenically unsaturated organic monomer into the porous inorganic substrate and subsequently polymerising the monomer within the pores of the substrate so that the resultant polymer is retained therein.
Claim 15
Dependent Claim
11 words
An ion-exchange material prepared by a process according to claim 1.
References Cited (Backward Citations)
US2460516A
Cited
US3352800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |