Patent US3198778A successfully refreshed from Google Patents.
US3198778A
Expired / Lapsed
US
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Process for preparing and vulcanizing olefin copolymers containing unsaturation
Assignee: Montedison SpA
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Filing: 1960-09-26
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Granted: 1965-08-03
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Crespi Giovanni
- 👤 Bruzzone Mario
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A METHOD FOR PREPARING HIGH MOLECULAR WEIGHT UNSATURATED COPOLYMERS OF ETHYLENE WITH A HIGHER ALPHAOLEFIN SELECTED FROM THE GROUP CONSISTING OF PROPYLENE AND BUTENE-L, WHICH ARE SULFUR-VULCANIZABLE BY PROCESSES USED CONVENTIONALLY FOR THE VULCANIZATION OF UNSATURATED RUBBERS, FROM HIGH MOLECULAR WEIGHT AMORPHOUS AND SATURATED COPOLYMERS OF ETHYLENE WITH THE SELECTED HIGHER ALPHA-OLEFIN, WHICH METHOD COMPRISES CONTACTING THE SATURATED COPOLYMER WITH FROM ABOUT 2 TO ABOUT 6 PARTS BY WEIGHT OF CHLORINE PER 100 PARTS OF THE AMORPHOUS COPOLYMER UNDER CONDITIONS SUCH THAT THE CHLORINE IS DISTRIBUTED HOMOGENEOUSLY IN THE COPOLYMER WITHOUT CHEMICAL COMBINATION OF THE CHLORINE WITH THE COPOLYMER, HEATING THE RESULTING MASS TO A TEMPERATURE NOT HIGHER THAN 100*C. UNTIL FROM 1% TO 3% BY WEIGHT OF CHLORINE IS HOMOGENEOUSLY COMBINED WITH THE COPOLYMER, AND THE DEHYDROCHLORINATING THE CHLORINATED COPOLYMER AT A TEMPERATURE ABOVE 160*C. AND BETWEEN 160*C. AND ABOUT 250*C., UNTIL VIRTUALLY ALL OF THE 1% TO 3% BY WEIGHT OF CHLORINE COMBINED WITH THE COPOLYMER IN THE CHLORINATING STEP IS REMOVED.
Claim 2
Independent Claim
164 words
A METHOD FOR PREPARING HIGH MOLECULAR WEIGHT UNSATURATED COPOLYMERS OF ETHYLENE WITH A HIGHER ALPHAOLEFIN SELECTED FROM THE GROUP CONSISTING OF PROPYLENE AND BUTENE-L, WHICH ARE SULFUR-VULCANIZABLE BY PROCESSES USED CONVENTIONALLY FOR THE VULCANIZATION OF UNSATURATED RUBBERS, FROM HIGH MOLECULAR WEIGHT AMORPHOUS AND SATURATED COPOLYMERS OF ETHYLENE WITH THE SELECTED HIGHER ALPHA-OLEFIN, WHICH METHOD COMPRISES CONTACTING THE SATURATED COPOLYMER WITH FROM ABOUT 2 TO ABOUT 6 PARTS BY WEIGHT OF CHLORINE PER 100 PARTS OF THE AMORPHOUS COPOLYMER UNDER CONDITIONS SUCH THAT THE CHLORINE IS DISTRIBUTED HOMOGENEOUSLY IN THE COPOLYMER WITHOUT CHEMICAL COMBINATION OF THE CHLORINE WITH THE COPOLYMER, HEATING THE RESULTING MASS TO A TEMPERATURE NOT HIGHER THAN 100*C. UNTIL FROM 1% TO 3% BY WEIGHT OF CHLORINE IS HOMOGENEOUSLY COMBINED WITH THE COPOLYMER, AND THE DEHYDROCHLORINATING THE CHLORINATED COPOLYMER AT A TEMPERATURE ABOVE 160*C. AND BETWEEN 160*C. AND ABOUT 250*C., UNTIL VIRTUALLY ALL OF THE 1% TO 3% BY WEIGHT OF CHLORINE COMBINED WITH THE COPOLYMER IN THE CHLORINATING STEP IS REMOVED.
References Cited (Backward Citations)
US2261757A
Cited
US2850490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |