Patent US3288731A successfully refreshed from Google Patents.
US3288731A
Expired / Lapsed
US
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Method for improving the properties of polymers containing acrylonitrile
Assignee: Atlantic Richfield Co
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Filing: 1963-09-24
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Granted: 1966-11-29
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Expires: 1983-09-24
Abstract
No abstract record available.
Inventors
- 👤 Alvin R Ingram
- 👤 Edward H Gleason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:15
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A METHOD OF MAKING ACRYLONITRILE-CONTAINING POLYMERIC BENDS WHICH ARE SUBSTANTIALLY FREE OF RESIDUAL ACRYLONITRILE AND DISCOLORATION COMPRISING THE STEPS OF: (1) POLYMERIZING AT A TEMPERATURE OF 65-100*C. A MONOMERIC MIXTURE COMPRISING 60-75 PERCENT BY WEIGHT OF VINYL ARYL MONOMER AND 25-40 PERCENT BY WEIGHT OF ACRYLONITRILE IN A AQUEOUS SUSPENSION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A FREE RADICAL INITIATOR UNTIL THE POLYMERIZATION HAS PROGRESSED TO ABOUT THE BEAD IDENTITY POINT; (2) ADDING A BASE SELECTED FROM THE GROUP CONSISTING OF: (A) ALKALI METAL HYDROXIDE AND OXIDE; (B) ALKALINE EARTH METAL HYDROXIDE AND OXIDE WHEREIN SAID ALKALINE EARTH METAL HAS AN ATOMIC NUMBER OF 20-56 INCLUSIVE; (C) TETRAALKYL QUATERNARY AMMONIUM COMPOUNDS WHEREIN SAID ALKYL GROUP IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, AND N,PROPYL; AND (D) ALKALI METAL SALTS OF WEAK ACIDS HAVING A PK OF AT LEAST 12.0; SAID BASE BEING ADDED IN AN AMOUNT SUFFICIENT TO MAINTAIN SAID BEADS IN A COLORLESS CONDITION; (3) THEREAFTER COMPLETING SAID POLYMERIZATION; AND (4) RECOVERING SAID POLYMERIC BEADS.
Claim 2
Independent Claim
172 words
A METHOD OF MAKING ACRYLONITRILE-CONTAINING POLYMERIC BENDS WHICH ARE SUBSTANTIALLY FREE OF RESIDUAL ACRYLONITRILE AND DISCOLORATION COMPRISING THE STEPS OF: (1) POLYMERIZING AT A TEMPERATURE OF 65-100*C. A MONOMERIC MIXTURE COMPRISING 60-75 PERCENT BY WEIGHT OF VINYL ARYL MONOMER AND 25-40 PERCENT BY WEIGHT OF ACRYLONITRILE IN A AQUEOUS SUSPENSION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A FREE RADICAL INITIATOR UNTIL THE POLYMERIZATION HAS PROGRESSED TO ABOUT THE BEAD IDENTITY POINT; (2) ADDING A BASE SELECTED FROM THE GROUP CONSISTING OF: (A) ALKALI METAL HYDROXIDE AND OXIDE; (B) ALKALINE EARTH METAL HYDROXIDE AND OXIDE WHEREIN SAID ALKALINE EARTH METAL HAS AN ATOMIC NUMBER OF 20-56 INCLUSIVE; (C) TETRAALKYL QUATERNARY AMMONIUM COMPOUNDS WHEREIN SAID ALKYL GROUP IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, AND N,PROPYL; AND (D) ALKALI METAL SALTS OF WEAK ACIDS HAVING A PK OF AT LEAST 12.0; SAID BASE BEING ADDED IN AN AMOUNT SUFFICIENT TO MAINTAIN SAID BEADS IN A COLORLESS CONDITION; (3) THEREAFTER COMPLETING SAID POLYMERIZATION; AND (4) RECOVERING SAID POLYMERIC BEADS.
References Cited (Backward Citations)
US3192169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |