Patent US1780168A successfully refreshed from Google Patents.
Patent US4331785A successfully refreshed from Google Patents.
US4331785A
Expired / Lapsed
US
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Vinyl substituted cyclic polyethers and addition polymers thereof
Assignee: Dow Chemical Co
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Filing: 1979-12-28
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Granted: 1982-05-25
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Expires: 1999-12-28
Abstract
Abstract Compounds represented by the formula ##STR1## and addition polymers thereof where m is an integer from 2 to about 10, X- is chlorine, hydroxy, carboxy or -AC-R)═CH.sub.2 -R is hydrogen or methyl, -R' is an ethylene or propylene group and -AC-R)═CH.sub.2 is one of ##STR2## These compounds and their addition polymers form complexes with alkali metal or alkaline earth metal salts and permit the concentration of aqueous solutions of said salts. For example, a compound of the formula ##STR3## is polymerized with an azobis(isobutyronitrile) catalyst to form addition polymers of the repeating unit ##STR4## When cross-linked, rendering it water-insoluble, such an addition polymer concentrates an aqueous solution of sodium chloride when contacted with same at about 0° C.
Inventors
- 👤 Thomas A. Chamberlin
- 👤 Donald A. Tomalia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:25
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/28; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01J; B01J45/00; C02; C02F; C02F1/00; C02F1/28; C02F1/285; C07; C07D; C07D323/00; C08F16/00; C08F16/12; C08F16/14; C08F16/26; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A process for concentrating an alkali metal or alkaline earth metal salt in aqueous solution comprising contacting an aqueous solution comprising said alkali metal or alkaline earth metal salt with a cross-linked, water-insoluble addition polymer of a compound represented by the formula ##STR25## wherein m is an integer from 2 to about 10, --X is --Cl, --OR" or --AC--R)═CH 2 ; --R is hydrogen or methyl; --R'-- is ethylene, 1,2-propylene or 1,3-propylene; --R" is hydrogen or lower hydrocarbyl; and --AC--R)═CH 2 is selected from the group consisting of --O--C--R)═CH 2 and ##STR26## provided that when --X is --Cl, --AC--R)═CH 2 is ##STR27## and further characterized in that when the cross-linked water-insoluble addition polymer is a homopolymer of the compound or a copolymer of the compound with a comonomer of monoethylene functionality, then --X is --AC--R)═CH 2 ; and when the cross-linked, water-insoluble addition polymer is a copolymer of the compound with a comonomer of multiple ethylene functionality then --X is --Cl, --OR" or --AC--R)═CH 2 .
Claim 2
Dependent Claim
166 words
A process for concentrating an alkali metal or alkaline earth metal salt in aqueous solution comprising contacting an aqueous solution comprising said alkali metal or alkaline earth metal salt with a cross-linked, water-insoluble addition polymer of a compound represented by the formula ##STR25## wherein m is an integer from 2 to about 10, --X is --Cl, --OR" or --AC--R)═CH 2 ; --R is hydrogen or methyl; --R'-- is ethylene, 1,2-propylene or 1,3-propylene; --R" is hydrogen or lower hydrocarbyl; and --AC--R)═CH 2 is selected from the group consisting of --O--C--R)═CH 2 and ##STR26## provided that when --X is --Cl, --AC--R)═CH 2 is ##STR27## and further characterized in that when the cross-linked water-insoluble addition polymer is a homopolymer of the compound or a copolymer of the compound with a comonomer of monoethylene functionality, then --X is --AC--R)═CH 2 ; and when the cross-linked, water-insoluble addition polymer is a copolymer of the compound with a comonomer of multiple ethylene functionality then --X is --Cl, --OR" or --AC--R)═CH 2 .
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein in the addition polymer, X is methoxyl, --R' is ethylene, --AC--R)═CH 2 is ##STR28## and m is 4 and said aqueous solution comprises sodium chloride.
References Cited (Backward Citations)
US3515707A
Cited
US4110520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |