US4007149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing latices of sulfonated elastomers
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-07-02
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Granted: 1977-02-08
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Expires: 1995-07-02
Abstract
Abstract Sulfonated ionomers of low unsaturation polymers in latex form are prepared in an improved process comprising sulfonating a butyl rubber or EPDM elastomer cement with an acyl sulfate, passivating the sulfonated cement with an organic epoxide, such as propylene oxide, and emulsifying the product in water with an anionic emulsifying agent.
Inventors
- 👤 Gilbert W. Burton
- 👤 Charles P. O'Farrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:36
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
115 words
A process for preparing a latex of a sulfonated low unsaturation elastomer, the elastomer being butyl rubber or EPDM, which comprises the steps of: a. providing a cement of the elastomer and a volatile solvent; b. sulfonating the elastomer cement with an acyl sulfate sulfonating agent; c. passivating the sulfonated cement with at least a stoichiometric amount of an organic epoxide containing at least one reactive oxirane group; d. providing an emulsion in water of the product of step (c) in neutralized form using an anionic surfactant, said product being neutralized with a weak base before or after emulsification; and e. thereafter stripping off excess water and solvent whereby a stable latex emulsion is obtained.
Claim 2
Dependent Claim
115 words
A process for preparing a latex of a sulfonated low unsaturation elastomer, the elastomer being butyl rubber or EPDM, which comprises the steps of: a. providing a cement of the elastomer and a volatile solvent; b. sulfonating the elastomer cement with an acyl sulfate sulfonating agent; c. passivating the sulfonated cement with at least a stoichiometric amount of an organic epoxide containing at least one reactive oxirane group; d. providing an emulsion in water of the product of step (c) in neutralized form using an anionic surfactant, said product being neutralized with a weak base before or after emulsification; and e. thereafter stripping off excess water and solvent whereby a stable latex emulsion is obtained.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the epoxide has 2 to 8 carbon atoms.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein the epoxide is propylene oxide or ethylene oxide.
Claim 5
Dependent Claim
10 words
The latex product produced by the process of claim 3.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the molar ratio of epoxide, based on the moles of reactive oxirane groups, to moles of sulfonating agent is from about 1:1 to 10:1.
Claim 7
Dependent Claim
28 words
The process of claim 1 wherein there is employed about 3 to 6 parts per hundred of anionic surfactant per hundred parts of elastomer present in said cement.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the anionic surfactant is a sodium, potassium or ammonium sulfate derivative of an ethoxylated nonylphenol.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said neutralization is effected after said emulsification.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the weak base is ammonium hydroxide, ethylamine or triethylamine.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the elastomer is butyl rubber.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein the elastomer is an EPDM.
Claim 13
Dependent Claim
10 words
The latex product produced by the process of claim 1.
Claim 14
Dependent Claim
12 words
The process of claim 1 wherein the sulfonating agent is acetyl sulfate.
Claim 15
Dependent Claim
10 words
The latex product produced by the process of claim 13.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |