Patent US2580490A successfully refreshed from Google Patents.
US2580490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for starting up low-tem-perature isoolefin polymerization
Assignee: Standard Oil Development Co
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Filing: 1948-01-30
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Granted: 1952-01-01
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Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Jr David C Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:56
CPC Classifications
C; C08; C08F; C08F210/00; Y; Y10; Y10S; Y10S526/00; Y10S526/922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
232 words
A METHOD FOR POLYMERIZING OLEFINS AT A SUBATMOSPHERIC TEMPERATURE TO PRODUCE A VULCANIZABLE POLYMER WHICH COMPRISES FORMING A FIRST MIXTURE OF A TERTIARY MONO-OLEFIN AND A DIOLEFIN IN AN ALKYL HALIDE DILUENT, THE AMOUNT OF TERTIARY MONO-OLEFIN IN THE MIXTURE BEING IN THE RANGE FROM 5 TO 15% AND THE DIOLEFIN BEING IN THE RANGE BETWEEN 0.5 AND 2.5% BASED ON THE TERTIARY MONO-OLEFIN AND THE REMAINDER ALKYL HALIDE, ADDING TO THE MIXTURE A NORMAL MONOOLEFIN IN AN AMOUNT BETWEEN 3 AND 15% BASED ON THE TETIARY MONO-OLEFIN, CHILLING THE MIXTURE TO A TEMPERATURE IN THE RANGE BETWEEN -50* AND -175* F., SUBJECTING THE CHILLED FIRST MIXTURE TO CONTACT WITH A FRIEDEL-CRAFTS TYPE CATALYST DISSOLVED IN AN ALKYL HALIDE SOLVENT TO CAUSE A POLYMERIZATION REACTION, SAID FRIEDEL-CRAFTS TYPE CATALYST CONTAINING AN ACTIVATION AMOUNT OF A PROMOTER FOR THE REACTION, FORMING A SECOND MIXTURE OF A TERTIARY MONO-OLEFIN AND A DIOLEFIN IN AN ALKYL HALIDE DILUENT, SAID TERTIARY MONO-OLEFIN IN SAID SECOND MIXTURE BEING IN THE RANGE FROM ABOUT 20% TO 30% OF THE MIXTURE AND SAID DIOLEFIN BEING IN THE RANGE FROM ABOUT 0.5 TO 2.5% BASED ON THE TERTIARY MONO-OLEFIN, AND THE REMAINDER ALKYL HALIDE, CHILLING SAID SECOND MIXTURE TO A TEMPERATURE IN THE RANGE BETWEEN -50* TO -175* F., ADDING SAID SECOND MIXTURE TO SAID FIRST MIXTURE IN GRADUALLY INCREASING AMOUNTS WHILE ADDITION OF SAID FIRST MIXTURE IS GRADUALLY DECREASED.
Claim 2
Independent Claim
232 words
A METHOD FOR POLYMERIZING OLEFINS AT A SUBATMOSPHERIC TEMPERATURE TO PRODUCE A VULCANIZABLE POLYMER WHICH COMPRISES FORMING A FIRST MIXTURE OF A TERTIARY MONO-OLEFIN AND A DIOLEFIN IN AN ALKYL HALIDE DILUENT, THE AMOUNT OF TERTIARY MONO-OLEFIN IN THE MIXTURE BEING IN THE RANGE FROM 5 TO 15% AND THE DIOLEFIN BEING IN THE RANGE BETWEEN 0.5 AND 2.5% BASED ON THE TERTIARY MONO-OLEFIN AND THE REMAINDER ALKYL HALIDE, ADDING TO THE MIXTURE A NORMAL MONOOLEFIN IN AN AMOUNT BETWEEN 3 AND 15% BASED ON THE TETIARY MONO-OLEFIN, CHILLING THE MIXTURE TO A TEMPERATURE IN THE RANGE BETWEEN -50* AND -175* F., SUBJECTING THE CHILLED FIRST MIXTURE TO CONTACT WITH A FRIEDEL-CRAFTS TYPE CATALYST DISSOLVED IN AN ALKYL HALIDE SOLVENT TO CAUSE A POLYMERIZATION REACTION, SAID FRIEDEL-CRAFTS TYPE CATALYST CONTAINING AN ACTIVATION AMOUNT OF A PROMOTER FOR THE REACTION, FORMING A SECOND MIXTURE OF A TERTIARY MONO-OLEFIN AND A DIOLEFIN IN AN ALKYL HALIDE DILUENT, SAID TERTIARY MONO-OLEFIN IN SAID SECOND MIXTURE BEING IN THE RANGE FROM ABOUT 20% TO 30% OF THE MIXTURE AND SAID DIOLEFIN BEING IN THE RANGE FROM ABOUT 0.5 TO 2.5% BASED ON THE TERTIARY MONO-OLEFIN, AND THE REMAINDER ALKYL HALIDE, CHILLING SAID SECOND MIXTURE TO A TEMPERATURE IN THE RANGE BETWEEN -50* TO -175* F., ADDING SAID SECOND MIXTURE TO SAID FIRST MIXTURE IN GRADUALLY INCREASING AMOUNTS WHILE ADDITION OF SAID FIRST MIXTURE IS GRADUALLY DECREASED.
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |