US2675370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous polymerization processes and resulting products
Assignee: Monsanto Chemicals Ltd
•
Filing: 1950-06-28
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Granted: 1954-04-13
•
Expires: 1970-06-28
Abstract
No abstract record available.
Inventors
- 👤 Gerald R Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:55
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F222/08; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A CONTINUOUS PROCESS OF POLYMERIZING MONOMERS OF POLYMERIZABLE UNSATURATED ORGANIC COMPOUNDS WHICH COMPRISES CONTINUOUSLY ADDING A POLYMERIZATION CATALYST, NON-POLYMERIZABLE INERT LIQUID, STYRENE AND AN UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MIXTURES OF MALEIC ANHYDRIDE AND ALKYL ESTERS OF MALEIC ACID, SAID MIXTURES CONTAINING AT LEAST 50% OF MALEIC ANHYDRIDE BY WEIGHT, MIXTURES OF MALEIC ANHYDRIDE AND ACRYLIC ACID AND MIXTURES OF MALEIC ANHYDRIDE AND METHACRYLIC ACID, TO A SLURRY OF A POLYMER OF STYRENE AND SAID UNSATURATED COMPOUND IN SAID INERT LIQUID, SAID INERT LIQUID BEING A NON-SOLVENT AND NON-SWELLING MEDIUM FOR SAID POLYMER AND BEING SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND CHLORINATED HYDROCARBONS, CONTINUOUSLY MAINTAINING THE TEMPERATURE OF SAID SLURRY SUFFICIENTLY HIGH TO EFFECT POLYMERIZATION OF THE MONOMERS OF STYRENE AND SAID UNSATURATED COMPOUND IN THE SLURRY THEREBY FORMING ADDITIONAL POLYMER OF STYRENE AND SAID UNSATURATED COMPOUND, AND CONTINUOUSLY REMOVING A MINOR PORTION OF THE SLURRY FROM THE BULK OF THE SLURRY.
Claim 2
Dependent Claim
159 words
A CONTINUOUS PROCESS OF POLYMERIZING MONOMERS OF POLYMERIZABLE UNSATURATED ORGANIC COMPOUNDS WHICH COMPRISES CONTINUOUSLY ADDING A POLYMERIZATION CATALYST, NON-POLYMERIZABLE INERT LIQUID, STYRENE AND AN UNSATURATED COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MIXTURES OF MALEIC ANHYDRIDE AND ALKYL ESTERS OF MALEIC ACID, SAID MIXTURES CONTAINING AT LEAST 50% OF MALEIC ANHYDRIDE BY WEIGHT, MIXTURES OF MALEIC ANHYDRIDE AND ACRYLIC ACID AND MIXTURES OF MALEIC ANHYDRIDE AND METHACRYLIC ACID, TO A SLURRY OF A POLYMER OF STYRENE AND SAID UNSATURATED COMPOUND IN SAID INERT LIQUID, SAID INERT LIQUID BEING A NON-SOLVENT AND NON-SWELLING MEDIUM FOR SAID POLYMER AND BEING SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND CHLORINATED HYDROCARBONS, CONTINUOUSLY MAINTAINING THE TEMPERATURE OF SAID SLURRY SUFFICIENTLY HIGH TO EFFECT POLYMERIZATION OF THE MONOMERS OF STYRENE AND SAID UNSATURATED COMPOUND IN THE SLURRY THEREBY FORMING ADDITIONAL POLYMER OF STYRENE AND SAID UNSATURATED COMPOUND, AND CONTINUOUSLY REMOVING A MINOR PORTION OF THE SLURRY FROM THE BULK OF THE SLURRY.
References Cited (Backward Citations)
US2375256A
Cited
US2392585A
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US2396785A
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US2383399A
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US2378138A
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US2522775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |