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US4413106A
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Heterogeneous sulfonation process for difficultly sulfonatable poly(ether sulfone)
Assignee: Albany International Corp
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Filing: 1982-12-27
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Granted: 1983-11-01
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Expires: 2002-12-27
Abstract
Abstract Novel sulfonated polyarylethersulfones are derived by heterogeneous sulfonation of polymer/solvent intercrystallites of difficultly sulfonatable polyarylethersulfones in chlorinated hydrocarbon solvents with a sulfonation agent.
Inventors
- 👤 Myron J. Coplan
- 👤 Gertrud Gotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:11
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/66; B01D71/68; C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A process for the sulfonation of a poly(ether sulfone) consisting essentially of repeating units of the formula: ##STR4## which comprises; providing said poly(ether sulfone) in the form of a polymer/solvent intercrystalline solid, suspended in a fluid, chlorinated hydrocarbon; and sulfonating the solid form in said suspension at a temperature within the range of from -50° to +80° C. with a sulfonating agent in sufficient proportion to obtain a ratio of the number of sulfur atoms in the sulfonation agent to the number of sulfur atoms in the polymer, which is within the range of between 0.4:1 to 5:1.
Claim 2
Dependent Claim
98 words
A process for the sulfonation of a poly(ether sulfone) consisting essentially of repeating units of the formula: ##STR4## which comprises; providing said poly(ether sulfone) in the form of a polymer/solvent intercrystalline solid, suspended in a fluid, chlorinated hydrocarbon; and sulfonating the solid form in said suspension at a temperature within the range of from -50° to +80° C. with a sulfonating agent in sufficient proportion to obtain a ratio of the number of sulfur atoms in the sulfonation agent to the number of sulfur atoms in the polymer, which is within the range of between 0.4:1 to 5:1.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the hydrocarbon is methylene chloride.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the sulfonation agent is sulfur trioxide.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |