US3873508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acrylonitrile polymer
Assignee: EIDP Inc
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Filing: 1973-12-27
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Granted: 1975-03-25
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Expires: 1993-12-27
Abstract
Abstract Preparation of acrylonitrile polymers by polymerizing monomer in an aqueous medium at 120* to 215*C. produces a polymer-hydrate melt which separates at the bottom of a reactor. A continuous coupled process for polymerization and extrusion into fibers is disclosed.
Inventors
- 👤 John J Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/04; C08F2/12; C08F2/16; D; D01; D01D; D01D5/00; D01D5/11; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
IN THE PREPARATION OF ACRYLONITRILE POLYMER CONTAINING AT LEAST 40 WEIGHT PERCENT ACRYLONITRILE BY AQUEOUS PHASE POLYMERIZATION OF MONOMER FOR EXTRUSION INTO FIBERS AND FILMS; AN IMPROVED PROCESS SUITABLE FOR USE IN A COUPLED POLYMERIZATION AND EXTRUSION PROCESS, WHEREIN THE IMPROVEMENT COMPRISES INITIATING THE POLYMERIZATION IN A REACTION MEDIUM CONSISTING ESSENTIALLY OF WATER, FREE RADICAL POLYMERIZATION INITIATOR, ACRYLONITRILE MONOMER AND OPTIONAL COMONOMER IN A PRESSURE REACTOR MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 120* TO ABOUT 215*C. UNDER AT LEAST AUTOGENOUS PRESSURE, CONTINUOUSLY FEEDING WATER, POLYMERIZATION INITIATOR AND ACRYLONITRILE MONOMER AND OPTIONAL COMONOMER TO THE REACTOR AT RATES SELECTED TO GIVE AN AVERAGE REACTOR WORKING-VOLUME HOLD-UP TIME OF 10 TO 90 MINUTES AND WHICH PROVIDE A MONOMER/WATER RATIO WITHIN THE RANGE OF ABOUT 0.25 TO ABOUT 4, AND ABOUT 0.01 TO ABOUT 1.0 PERCENT OF INITIATOR BASED ON THE WEIGHT OF MONOMER PRESENT, CONTINUOUSLY REMOVING ACRYLONITRILE POLYMER-HYDRATE MELT FROM THE BOTTOM OF THE REACTOR, AND THEN REMOVING FREE-PHASE WATER AND ANY UNCOVERED, VOLATILE MONOMER FROM THE POLYMER-HYDRATE MELT.
Claim 2
Dependent Claim
170 words
IN THE PREPARATION OF ACRYLONITRILE POLYMER CONTAINING AT LEAST 40 WEIGHT PERCENT ACRYLONITRILE BY AQUEOUS PHASE POLYMERIZATION OF MONOMER FOR EXTRUSION INTO FIBERS AND FILMS; AN IMPROVED PROCESS SUITABLE FOR USE IN A COUPLED POLYMERIZATION AND EXTRUSION PROCESS, WHEREIN THE IMPROVEMENT COMPRISES INITIATING THE POLYMERIZATION IN A REACTION MEDIUM CONSISTING ESSENTIALLY OF WATER, FREE RADICAL POLYMERIZATION INITIATOR, ACRYLONITRILE MONOMER AND OPTIONAL COMONOMER IN A PRESSURE REACTOR MAINTAINED AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 120* TO ABOUT 215*C. UNDER AT LEAST AUTOGENOUS PRESSURE, CONTINUOUSLY FEEDING WATER, POLYMERIZATION INITIATOR AND ACRYLONITRILE MONOMER AND OPTIONAL COMONOMER TO THE REACTOR AT RATES SELECTED TO GIVE AN AVERAGE REACTOR WORKING-VOLUME HOLD-UP TIME OF 10 TO 90 MINUTES AND WHICH PROVIDE A MONOMER/WATER RATIO WITHIN THE RANGE OF ABOUT 0.25 TO ABOUT 4, AND ABOUT 0.01 TO ABOUT 1.0 PERCENT OF INITIATOR BASED ON THE WEIGHT OF MONOMER PRESENT, CONTINUOUSLY REMOVING ACRYLONITRILE POLYMER-HYDRATE MELT FROM THE BOTTOM OF THE REACTOR, AND THEN REMOVING FREE-PHASE WATER AND ANY UNCOVERED, VOLATILE MONOMER FROM THE POLYMER-HYDRATE MELT.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein the polymerizable monomer comprises at least 85 weight percent acrylonitrile.
Claim 4
Dependent Claim
29 words
The process of claim 2, wherein the polymerhydrate melt is extruded into a zone characterized by lower temperature and pressure than in the reactor to form fibers or films.
Claim 5
Dependent Claim
66 words
The process of claim 2 wherein, while still under at least autogenous pressure, the polymer-hydrate-melt removed from the reactor is separated from any entrained aqueous or volatile materials, from 0.5 to 10 percent, based on dry polymer content, of a compatible solvent for the polymer is added, and then the polymer-hydrate-melt is extruded into a zone characterized by lower temperature and pressure than in the reactor.
Claim 6
Dependent Claim
45 words
The process of claim 2 wherein, while still under at least autogenous pressure, the polymer-hydrate-melt removed from the reactor is mixed with controlled amount of water and then the polymer-hydrate-melt is extruded into a zone characterized by lower temperature and pressure than in the reactor.
References Cited (Backward Citations)
US3499879A
Cited
US3697492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |