Patent US4119616A successfully refreshed from Google Patents.
US4119616A
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Process for sulfonating unsaturated elastomers using acyl sulfates
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-09-30
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Granted: 1978-10-10
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Expires: 1994-09-30
Abstract
Abstract A process for sulfonating unsaturated elastomers which comprises sulfonating an olefinically unsaturated elastomer using as the sulfonating agent an acyl sulfate. The products produced thereby have improved properties over those sulfonated elastomers prepared by prior art methods. The preferred acyl sulfate is acetyl sulfate. The sulfonated elastomers of this invention are useful as films, adhesives and for other general purpose rubber uses. Especially advantageous properties are obtained when the sulfonic acid polymer is neutralized with ethylamine.
Inventors
- 👤 Charles P. O'Farrell
- 👤 George E. Serniuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:31
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/20; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20; Y; Y10; Y10S; Y10S260/00; Y10S260/31
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
In a process for preparing a sulfonic acid ionomer of an olefinically unsaturated elastomer wherein said elastomer is an EPDM, the improvement which comprises using as a sulfonating agent acetyl sulfate, propionyl sulfate or butyryl sulfate, and sulfonating said EPDM until said EPDM contains 0.08 mole % to 15 mole % SO 3 H.
Claim 2
Dependent Claim
54 words
In a process for preparing a sulfonic acid ionomer of an olefinically unsaturated elastomer wherein said elastomer is an EPDM, the improvement which comprises using as a sulfonating agent acetyl sulfate, propionyl sulfate or butyryl sulfate, and sulfonating said EPDM until said EPDM contains 0.08 mole % to 15 mole % SO 3 H.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the acetyl, propionyl or butyryl sulfate is prepared by reacting the corresponding anhydride with sulfuric acid.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the acetyl, propionyl or butyryl sulfate is prepared by reacting the corresponding acid with SO 3 .
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the sulfonated elastomer is neutralized.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the neutralizing agent is an organo amine.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein the amine is a hydrocarbyl amine.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein the amine is ethylamine.
Claim 9
Dependent Claim
40 words
The process of claim 1 wherein the acetyl, propionyl or butyryl sulfate is prepared in situ by first adding the corresponding anhydride to a solution of the elastomer and subsequently adding sulfuric acid to the mixture of elastomer and anhydride.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |