US4256857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halobutyl of improved green strength
Assignee: Polysar Ltd
•
Filing: 1979-05-09
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Granted: 1981-03-17
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Expires: 1999-05-09
Abstract
Abstract Bromobutyl rubber compounds of improved green strength are prepared by reacting bromobutyl rubber with selected amine compounds such that not less than about 1/100th and not more than 1/12th of the bromine in the bromobutyl is reacted with the amine compound.
Inventors
- 👤 Ernest J. Buckler
- 👤 George Feniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:13
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0008; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; Y; Y10; Y10S; Y10S152/00; Y10S152/12; Y10T; Y10T152/00; Y10T152/10; Y10T152/10135; Y10T152/10234; Y10T152/10243
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A process of preparing bromobutyl rubber compositions of improved green strength which process comprises reacting bromobutyl rubber with a tertiary amine selected from N,N-dimethyl hexylamine, N,N-dimethyl dodecylamine, N,N-dimethyl octadecylamine, N,N-dimethyl decylamine and N,N-dimethyl benzylamine, the amount of said amine being from about 1/100th to about 1/12th of a chemical equivalent of amine per chemical equivalent of bromine in the bromobutyl rubber, the reaction being at a temperature of from about 25° C. to about 150° C. for a time of from 1 hour to about 48 hours.
Claim 2
Dependent Claim
87 words
A process of preparing bromobutyl rubber compositions of improved green strength which process comprises reacting bromobutyl rubber with a tertiary amine selected from N,N-dimethyl hexylamine, N,N-dimethyl dodecylamine, N,N-dimethyl octadecylamine, N,N-dimethyl decylamine and N,N-dimethyl benzylamine, the amount of said amine being from about 1/100th to about 1/12th of a chemical equivalent of amine per chemical equivalent of bromine in the bromobutyl rubber, the reaction being at a temperature of from about 25° C. to about 150° C. for a time of from 1 hour to about 48 hours.
Claim 3
Dependent Claim
46 words
The process of claim 1 wherein said bromobutyl rubber composition is characterized by a change in modulus in the green state from 100% extension to 200% extension of from -10% to +15% and an elongation at break in the green state of not less than 250%.
Claim 4
Dependent Claim
46 words
The process of claim 1 characterized in that the amine is added to the bromobutyl rubber when the bromobutyl rubber is one of (a) as a solution in a solvent, (b) as an aqueous slurry or (c) when in a Banbury mixer or on a mill.
Claim 5
Dependent Claim
21 words
The process of claim 1 characterized in that the bromobutyl rubber contains from about 1 to 5 weight percent of bromine.
Claim 6
Dependent Claim
46 words
The process of claim 4 characterized in that said amine is added to said bromobutyl rubber in a Banbury mixer or on a mill and the reaction takes place at a temperature of from 50° to 100° C. for a time between 5 and 20 hours.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |