US4225677A
Expired / Lapsed
US
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Process for the chloromethylation of polymers for the production of anionic exchange resins
Assignee: Rohm and Haas Co
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Filing: 1979-01-12
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Granted: 1980-09-30
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Expires: 1999-01-12
Abstract
Abstract Improved process for the chloromethylation of cross-linked vinylaromatic polymers and copolymers wherein a chlorine generator is incorporated into the reactants and a metallic chloride replaces part or all of the sulfuric acid used in forming the chloromethylating complex. The chloromethylated polymer may be further functionalized to produce an ion-exchange resin.
Inventors
- 👤 Jacques L. Boutier
- 👤 Paul D. A. Grammont
- 👤 Jean E. E. Herbin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:14
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
In a process for the chloromethylation of cross-linked vinylaromatic polymers and copolymers using a chloromethylating complex based on chloromethyl methyl ether and sulfuric acid, the improvement which comprises incorporating chlorosulfonic acid into the reactants and replacing the sulfuric acid used in formation of the complex with an equivalent quantity of alkali metal or alkaline earth metal chloride, the amount of metal chloride being adjusted to provide a sulfuric acid/chloromethyl methyl ether molar ratio of at least 0.4 in the complex.
Claim 2
Dependent Claim
80 words
In a process for the chloromethylation of cross-linked vinylaromatic polymers and copolymers using a chloromethylating complex based on chloromethyl methyl ether and sulfuric acid, the improvement which comprises incorporating chlorosulfonic acid into the reactants and replacing the sulfuric acid used in formation of the complex with an equivalent quantity of alkali metal or alkaline earth metal chloride, the amount of metal chloride being adjusted to provide a sulfuric acid/chloromethyl methyl ether molar ratio of at least 0.4 in the complex.
Claim 3
Dependent Claim
43 words
The process according to claim 1 wherein the chloromethylating complex is obtained from a mixture of formaldehyde, methanol and chlorosulfonic acid, and a portion of the chlorosulfonic acid is replaced by an equivalent quantity of an alkali metal or alkaline earth metal chloride.
Claim 4
Dependent Claim
19 words
The process according to claim 1 wherein the sulfuric acid/chloromethyl methyl ether molar ratio is between 0.4 and 1.
Claim 5
Dependent Claim
24 words
The process of claim 1 including the additional step of adding a functional group to the chloromethylated polymer to produce an anion exchange resin.
Claim 6
Dependent Claim
14 words
The process according to claim 4 wherein a functional group is added by amination.
Claim 7
Dependent Claim
11 words
A chloromethylated polymer prepared according to the process of claim 1.
Claim 8
Dependent Claim
12 words
An anion exchange resin prepared according to the process of claim 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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |