US2957857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the suspension polymerization of vinyl halides
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-06-25
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Granted: 1960-10-25
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Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Richard H Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:22
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; C08F291/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A PROCESS FOR THE SUSPENSION POLYMERIZATION OF A VINYL HALIDE OF THE GROUP CONSISTING OF VINYL FLUORIDE, VINYL CHLORIDE AND VINYL BROMIDE IN WHICH THE VINYL HALIDE IS SUSPENDED AND POLYMERIZED IN WATER CONTAINING A WATER-SOLUBLE INTERPOLYMER OF MALEIC COMPOUND OF THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MALEIC ACID AND MALEINIMIDE AND AN INTERPOLYMERIZABLE VINYLIDENE MONOMER AS A SUSPENDING AGENT FOR THE VINYL HALIDE POLYMER, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE POLYMERIZATION SYSTEM A MINOR AMOUNT OF A HYDROXYL GROUP-CONTAINING INTERPOLYMER CONTAINING FROM 1.5 TO 12.0 WEIGHT PERCENT HYDROXYL GROUPS AS AN AUXILIARY SUSPENDING AGENT, SAID HYDROXYL GROUP-CONTAINING INTERPOLYMER BEING AN INTERPOLYMER OF (1) AN UNSATURATED ALCOHOL OF THE GROUP CONSISTING OF ALLYL ALCOHOL, METHALLYL ALCOHOL AND MIXTURES THEREOF AND (2) AN ACRYLATE ESTER OF THE GROUP CONSISTING OF ACRYLATE AND METHACRYLATE ESTERS OF 1-10 CARBON ATOM MONOHYDRIC ALKANOLS PREPARED BY ADMIXING SAID UNSATURATED ALCOHOL AND SAID ACRYLATE ESTER IN A HOMOGENEOUS SYSTEM AND HEATING AT 150-200*C. UNDER AUTOGENEOUS PRESSURE.
Claim 2
Dependent Claim
162 words
IN A PROCESS FOR THE SUSPENSION POLYMERIZATION OF A VINYL HALIDE OF THE GROUP CONSISTING OF VINYL FLUORIDE, VINYL CHLORIDE AND VINYL BROMIDE IN WHICH THE VINYL HALIDE IS SUSPENDED AND POLYMERIZED IN WATER CONTAINING A WATER-SOLUBLE INTERPOLYMER OF MALEIC COMPOUND OF THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MALEIC ACID AND MALEINIMIDE AND AN INTERPOLYMERIZABLE VINYLIDENE MONOMER AS A SUSPENDING AGENT FOR THE VINYL HALIDE POLYMER, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE POLYMERIZATION SYSTEM A MINOR AMOUNT OF A HYDROXYL GROUP-CONTAINING INTERPOLYMER CONTAINING FROM 1.5 TO 12.0 WEIGHT PERCENT HYDROXYL GROUPS AS AN AUXILIARY SUSPENDING AGENT, SAID HYDROXYL GROUP-CONTAINING INTERPOLYMER BEING AN INTERPOLYMER OF (1) AN UNSATURATED ALCOHOL OF THE GROUP CONSISTING OF ALLYL ALCOHOL, METHALLYL ALCOHOL AND MIXTURES THEREOF AND (2) AN ACRYLATE ESTER OF THE GROUP CONSISTING OF ACRYLATE AND METHACRYLATE ESTERS OF 1-10 CARBON ATOM MONOHYDRIC ALKANOLS PREPARED BY ADMIXING SAID UNSATURATED ALCOHOL AND SAID ACRYLATE ESTER IN A HOMOGENEOUS SYSTEM AND HEATING AT 150-200*C. UNDER AUTOGENEOUS PRESSURE.
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |