US2651628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for alkylating polystyrene
Assignee: Standard Oil Development Co
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Filing: 1950-09-26
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Granted: 1953-09-08
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Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Welch Lester Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F8/00; C08F8/02; C10M2205/00; C10M2205/04; C10N; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE PREPARATION OF LUBRICANT ADDITIVES HAVING THE DESIRABLE CHARACTERISTICS OF DEPRESSING THE POUR POINT OF WAXY MINERAL LUBRICATING OILS WITH WHICH THEY ARE BLENDED WHICH COMPRISES DISSOLVING POLYSTYRENE OF A MOLECULAR WEIGHT WITHIN A RANGE OF FROM 25,000 TO 45,000 IN A NON-REACTIVE POLAR SOLVENT SELECTED FROM THE CLASS CONSISTING OF TETRACHLORETHYLENE, O-DICHLOROBENZENE, CARBON DISULIFIDE, P-DICHLLOROBENZENNE, CHLOROBENZENE, AND NITROBENZENE, ADDING THERETO FRIEDEL-CRAFTS CATALYST, SLOWLY ADDING TO THE MIXTURE SUFFICIENT OF AN ALIPHATIC MONOLEFIN CONTAINING FROM 16 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN TO ALKYLATE SAID POLYSTYRENE TO A DEGREE WITHIN THE RANGE OF FROM 75% TO 100%, MAINTAINING THE REACTION TEMPERATURE BETWEEN 30* AND 75* F. FOR A PERIOD OF TIME SUFFICIENT TO FORM A PRODUCT HAVING A MOLECULAR WEIGHT WITHIN A RANGE OF FROM 6,000 TO 18,000 STAUNDINGER, AND RECOVERING THE DESIRED FINAL PRODUCT THEREFROM.
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE PREPARATION OF LUBRICANT ADDITIVES HAVING THE DESIRABLE CHARACTERISTICS OF DEPRESSING THE POUR POINT OF WAXY MINERAL LUBRICATING OILS WITH WHICH THEY ARE BLENDED WHICH COMPRISES DISSOLVING POLYSTYRENE OF A MOLECULAR WEIGHT WITHIN A RANGE OF FROM 25,000 TO 45,000 IN A NON-REACTIVE POLAR SOLVENT SELECTED FROM THE CLASS CONSISTING OF TETRACHLORETHYLENE, O-DICHLOROBENZENE, CARBON DISULIFIDE, P-DICHLLOROBENZENNE, CHLOROBENZENE, AND NITROBENZENE, ADDING THERETO FRIEDEL-CRAFTS CATALYST, SLOWLY ADDING TO THE MIXTURE SUFFICIENT OF AN ALIPHATIC MONOLEFIN CONTAINING FROM 16 TO 20 CARBON ATOMS IN A STRAIGHT CHAIN TO ALKYLATE SAID POLYSTYRENE TO A DEGREE WITHIN THE RANGE OF FROM 75% TO 100%, MAINTAINING THE REACTION TEMPERATURE BETWEEN 30* AND 75* F. FOR A PERIOD OF TIME SUFFICIENT TO FORM A PRODUCT HAVING A MOLECULAR WEIGHT WITHIN A RANGE OF FROM 6,000 TO 18,000 STAUNDINGER, AND RECOVERING THE DESIRED FINAL PRODUCT THEREFROM.
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) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |