US2615004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed diluent system for copolymerization of styrene and isobutylene
Assignee: Standard Oil Development Co
•
Filing: 1950-08-30
•
Granted: 1952-10-21
•
Expires: 1970-08-30
Abstract
No abstract record available.
Inventors
- 👤 Gabriel E Jasper
- 👤 Welch Lester Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS FOR THE PREPARATION OF SUBSTANTIALLY COMPLETELY MINERAL OIL SOLUBLE STYRENE-ISOBUTYLENE COPOLYMERS HAVING MOLECULAR WEIGHTS WITHIN A RANGE OF FROM ABOUT 10,000 TO 30,000 STAUDINGER WHICH COMPRISES COPOLYMERIZING A MIXTURE OF STYRENE AND ISOBUTYLENE CONTAINING ABOUT 0.77 TO 1.63 MOLS OF STYRENE PER MOL OF ISOBUTYLENE IN THE PRESENCE OF A SOLUTION OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE BETWEEN ABOUT -100* C. TO -30* C. AND IN THE PRESENCE OF ABOUT 2 TO 6 VOLUMES OF A MIXED DILUENT, SAID MIXTURE CONTAINING OF ABOUT 3 TO 8 PARTS BY VOLUME OF AN INERT ALIPHATIC HYDROCARBON SOLVENT CONTAINING FROM 2 TO 6 CARBON ATOMS PER MOLECULE AND ABOUT 1 PART BY VOLUME OF A CHLORINATED ALIPHATIC HYDROCARBON CONTAINING FROM 1 TO 4 CARBON ATOMS PER MOLECULE, MAINTAINING A CONVERSION LEVEL BETWEEN 30% AND 60% AND RECOVERING THE PRODUCT THEREFROM.
Claim 2
Dependent Claim
140 words
A PROCESS FOR THE PREPARATION OF SUBSTANTIALLY COMPLETELY MINERAL OIL SOLUBLE STYRENE-ISOBUTYLENE COPOLYMERS HAVING MOLECULAR WEIGHTS WITHIN A RANGE OF FROM ABOUT 10,000 TO 30,000 STAUDINGER WHICH COMPRISES COPOLYMERIZING A MIXTURE OF STYRENE AND ISOBUTYLENE CONTAINING ABOUT 0.77 TO 1.63 MOLS OF STYRENE PER MOL OF ISOBUTYLENE IN THE PRESENCE OF A SOLUTION OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE BETWEEN ABOUT -100* C. TO -30* C. AND IN THE PRESENCE OF ABOUT 2 TO 6 VOLUMES OF A MIXED DILUENT, SAID MIXTURE CONTAINING OF ABOUT 3 TO 8 PARTS BY VOLUME OF AN INERT ALIPHATIC HYDROCARBON SOLVENT CONTAINING FROM 2 TO 6 CARBON ATOMS PER MOLECULE AND ABOUT 1 PART BY VOLUME OF A CHLORINATED ALIPHATIC HYDROCARBON CONTAINING FROM 1 TO 4 CARBON ATOMS PER MOLECULE, MAINTAINING A CONVERSION LEVEL BETWEEN 30% AND 60% AND RECOVERING THE PRODUCT THEREFROM.
References Cited (Backward Citations)
US2491525A
Cited
US2478843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |