US4081590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic polymerization catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1976-09-02
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Granted: 1978-03-28
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Expires: 1996-09-02
Abstract
Abstract High molecular weight polymers and highly unsaturated polymers (e.g., butyl rubber) are prepared by homopolymerizing and copolymerizing olefins, isoolefins, conjugated multiolefins, or mixtures of isoolefins and conjugated multiolefins with a catalyst system comprising an organoaluminum compound in conjunction with a cocatalyst selected from the group consisting of sulfur dioxide, sulfur trioxide, halogens, mixed halogens and hypohalides.
Inventors
- 👤 Joseph P. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:52
CPC Classifications
C; C08; C08F; C08F10/00; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F210/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A cationic catalyst for the homopolymerization of isoolefins and copolymerization of isoolefins and conjugated dienes, said cationic catalyst formed by the reaction comprising: (a) an organoaluminum having the formula AlR 2 X wherein X is a halogen or hydrogen atom and R is the same or a different monovalent radical selected from the group consisting of C 1 -C 12 alkyl, phenyl, C 7 -C 14 aralkyl and C 7 -C 14 alkaryl; and (b) a cocatalyst selected from the group consisting of sulfur dioxide, sulfur trioxide, mixed halogens, iodine, and hypohalides, the molar tatio of said AlR 2 X to said cocatalyst being greater than 1:1.
Claim 2
Dependent Claim
107 words
A cationic catalyst for the homopolymerization of isoolefins and copolymerization of isoolefins and conjugated dienes, said cationic catalyst formed by the reaction comprising: (a) an organoaluminum having the formula AlR 2 X wherein X is a halogen or hydrogen atom and R is the same or a different monovalent radical selected from the group consisting of C 1 -C 12 alkyl, phenyl, C 7 -C 14 aralkyl and C 7 -C 14 alkaryl; and (b) a cocatalyst selected from the group consisting of sulfur dioxide, sulfur trioxide, mixed halogens, iodine, and hypohalides, the molar tatio of said AlR 2 X to said cocatalyst being greater than 1:1.
Claim 3
Dependent Claim
12 words
The catalyst of claim 1, wherein the cocatalyst is said sulfur trioxide.
Claim 4
Dependent Claim
12 words
The catalyst of claim 1, wherein the cocatalyst is said mixed halogens.
Claim 5
Dependent Claim
11 words
The catalyst of claim 3, wherein the cocatalyst is said hypohalides.
Claim 6
Dependent Claim
30 words
The catalyst of claim 1 wherein the organoaluminum is aluminum diethyl chloride, aluminum dimethyl chloride, aluminum diethyl hydride, aluminum dimethyl bromide, aluminum dibutyl chloride, aluminum diethyl iodide or mixtures thereof.
Claim 7
Dependent Claim
23 words
The catalyst of claim 1 wherein molar the ratio of organoaluminum to cocatalyst is in the range of 1000:1 to greater than 1:1.
Claim 8
Dependent Claim
11 words
The catalyst of claim 1 wherein the cocatalyst is sulfur dioxide.
Claim 9
Dependent Claim
19 words
The catalyst of claim 1 wherein the molar ratio of organoaluminum to cocatalyst is about 100:1 to about 2:1.
Claim 10
Dependent Claim
19 words
The catalyst of claim 1 wherein the molar ratio of organoaluminum to cocatalyst is about 10:1 to about 3:1.
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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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |