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US4273878A
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Polyamine-crosslinked anion exchange resin
Assignee: Rohm and Haas Co
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Filing: 1979-06-04
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Granted: 1981-06-16
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Expires: 1999-06-04
Abstract
Abstract Anion exchange resins produced by reacting a stabilized polychloromethylstyrene polymer bead with a polyamine containing at least two tertiary amine groups of which at least one is a terminal group, and processes for producing the resins in uniform sizes.
Inventors
- 👤 David R. Amick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F2810/00; C08F2810/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A process for preparing anion exchange resin beads which comprises forming poly(chloromethylstyrene) beads under suspension polymerization conditions, stabilizing the beads, swelling the beads with an organic solvent, and reacting the swollen beads with a polyamine which will simultaneously crosslink and functionalize the beads, said polyamine containing at least two tertiary amine groups of which at least one is a terminal group.
Claim 2
Dependent Claim
61 words
A process for preparing anion exchange resin beads which comprises forming poly(chloromethylstyrene) beads under suspension polymerization conditions, stabilizing the beads, swelling the beads with an organic solvent, and reacting the swollen beads with a polyamine which will simultaneously crosslink and functionalize the beads, said polyamine containing at least two tertiary amine groups of which at least one is a terminal group.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the poly(chloromethylstyrene) bead to be reacted with the polyamine is poly(vinylbenzyl/chloride).
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein the polyamine is tetramethyliminobispropylamine.
Claim 5
Dependent Claim
10 words
The process of claim 2 wherein the polyamine is N,N,N'N'-tetramethylhexamethylenediamine.
Claim 6
Dependent Claim
53 words
The process of claim 1 wherein the polyamine has the formula (a) (CH 3 ) 2 (CH 2 ) n N(CH 3 ) 2 wherein n is 2-12; or (b) (CH 3 ) 2 N(CH 2 ) m NH(CH 2 ) n' N(CH 3 ) 2 wherein m and n' independently are 2-6.
Claim 7
Dependent Claim
16 words
The process of claim 5 wherein n is 4-6 and m and n' independently are 2-4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |