US4150205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite ion exchange resins having low residual amounts of quaternary ammonium cation
Assignee: Dow Chemical Co
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Filing: 1978-02-01
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Granted: 1979-04-17
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Expires: 1998-02-01
Abstract
Abstract Improved composite ion exchange resin bodies comprising a reaction product of an ingredient containing carboxylate anions polymerized within a strong base anion exchange resin, said resin bodies having low residual amounts of quaternary ammonium cation not intimately associated with said carboxylate anions to minimize inorganic chloride and chlorate anion leakage in ion exchange column operation.
Inventors
- 👤 Robert M. Wheaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:52
CPC Classifications
C; C01; C01D; C01D1/00; C01D1/04; C01D1/28; C01D1/32; B; B01; B01J; B01J43/00; C01D7/00; C01D7/22; C01D7/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A solid, composite ion exchange resin which comprises at least two intimately associated resin ingredients, including an insoluble, cross-linked resin ingredient which contains quaternary ammonium cations as anion-exchanging groups, and a polymerized ingredient which contains ionizable carboxylate anions as cation-exchanging groups, residual amounts of quaternary ammonium cation not intimately associated with said carboxylate anions in said composite resin bodies being maintained at about or below 0.02 meq/ml of bulk resin body volume.
Claim 2
Dependent Claim
72 words
A solid, composite ion exchange resin which comprises at least two intimately associated resin ingredients, including an insoluble, cross-linked resin ingredient which contains quaternary ammonium cations as anion-exchanging groups, and a polymerized ingredient which contains ionizable carboxylate anions as cation-exchanging groups, residual amounts of quaternary ammonium cation not intimately associated with said carboxylate anions in said composite resin bodies being maintained at about or below 0.02 meq/ml of bulk resin body volume.
Claim 3
Dependent Claim
29 words
The resin body of claim 1 wherein the residual amount of the quaternary ammonium cations in said composite resin body is maintained about or below 0.01 milliequivalents per milliliter.
Claim 4
Dependent Claim
16 words
The resin body of claim 1 wherein the ingredient containing ionizable carboxylate anions is polyacrylic acid.
Claim 5
Dependent Claim
30 words
The resin body of claim 1 wherein the ingredient containing quaternary ammonium cations is a cross-linked copolymer of a major proportion of styrene and minor proportions of ethylvinylbenzene and divinylbenzene.
Claim 6
Dependent Claim
30 words
The resin body of claim 3 wherein the ingredient containing quaternary ammonium cations is a cross-linked copolymer of a major proportion of styrene and minor proportions of ethylvinylbenzene and divinylbenzene.
Claim 7
Dependent Claim
16 words
The resin body of claim 2 wherein the ingredient containing ionizable carboxylate anions is polyacrylic acid.
Claim 8
Dependent Claim
30 words
The resin body of claim 2 wherein the ingredient containing quaternary ammonium cations is a cross-linked copolymer of a major proportion of styrene and minor proportions of ethylvinylbenzene and divinylbenzene.
Claim 9
Dependent Claim
30 words
The resin body of claim 7 wherein the ingredient containing quaternary ammonium cations is a cross-linked copolymer of a major proportion of styrene and minor proportions of ethylvinylbenzene and divinylbenzene.
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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |