US3683511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing volatiles from an elastomer
Assignee: Bridgestone Firestone Inc
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Filing: 1970-09-04
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Granted: 1972-08-15
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Expires: 1990-09-04
Abstract
Abstract Volatile hydrocarbons are removed from an elastomer by mechanically working the elastomer in an extruder to increase its temperature, admixing an inert gas or water through at least one inlet, allowing vapors to flash from the mixture through at least one vented section in the extruder and discharging the elastomer from the end of the extruder at a lower content of volatile hydrocarbons. Oil, antioxidant and other elastomer compounding materials can optionally be added during the operation.
Inventors
- 👤 Charles R Johnson
- 👤 Seid H Moosavian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:29
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/06; C08F6/12; B; B29; B29B; B29B13/00; B29B13/06; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; C08C; C08C2/00; C08C2/06; C08C3/00; B29C48/03; B29K; B29K2021/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
23 words
The method of claim 1, wherein the mixture is subjected to a plurality of mechanical work operations, each followed by a flash operation.
Claim 2
Dependent Claim
25 words
The method of claim 1, wherein the elastomer as charged contains from about 10 per cent to about 50 per cent volatile hydrocarbons, by weight.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the elastomer as discharged contains less than about 1.5 per cent volatile hydrocarbons.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein the elastomer is polybutadiene or a copolymer of butadiene and styrene.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein the volatile hydrocarbons consist essentially of hexane or pentane.
Claim 6
Dependent Claim
18 words
The method of claim 1, with the additional step of adding oil at another inlet in the extruder.
Claim 7
Dependent Claim
38 words
The method of claim 1, wherein the elastomer discharged from the end of the extruder is fed into a second extruder, and oil is introduced at an inlet in the second extruder, whereby an oil-elastomer mixture is produced.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein elastomer fines which pass through the vented section in the extruder are recycled.
Claim 9
Dependent Claim
17 words
The method of claim 1, wherein solid compounding ingredients are added to the elastomer during the process.
Claim 10
Dependent Claim
17 words
The method of claim 1, with the previous step of admixing oil and filler into the elastomer.
Claim 11
Independent Claim
88 words
The method of continuously removing volatile hydrocarbons contained in an elastomer comprising the successive steps of charging an elastomer which contains residual initiator into an extruder, mechanically working the elastomer whereby its temperature is increased, adding an inert gas through an inlet in the extruder and mixing the inert gas with the elastomer, allowing vapors to flash from the mixture thus formed and escape through a vented section in the extruder, and discharging the elastomer from the end of the extruder at a lower content of volatile hydrocarbons.
Claim 12
Dependent Claim
17 words
The method of claim 12, wherein the elastomer is polybutadiene or a copolymer of butadiene and styrene.
Claim 13
Dependent Claim
11 words
The method of claim 12, wherein the inert gas is nitrogen.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |