Patent US2905656A successfully refreshed from Google Patents.
US2905656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isopropyl benzene-acrolein styrene terpolymer
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-06-24
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Granted: 1959-09-22
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Expires: 1977-06-24
Abstract
No abstract record available.
Inventors
- 👤 Earl C Chapin
- 👤 Jr Raymond I Longley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:37
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR MAKING A COPOLYMER OF 10-60 MOL PERCENT OF ACROLEIN AND 90-40 MOL PERCENT OF A VINYL AROMATIC COMPOUND, SAID COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF 700-10,000. WHICH COMPRISES POLYMERIZING A MIXTURE OF THE MONOMERS AT 180*250*C. UNDER AT LEAST AUTOGENOUS PRESSURE IN THE PRESENCE OF AN AMOUNT OF AN ALKYLBENZENE SUFFICENT AT THE REACTION CONDICTION TO FORM AN ACROLEIN-VINYL AROMATIC COMPOUND-ALKYLBENZENE PRODUCT CONTAINING 1-15 MOL PERCENT OF CHEMICALY COMBINED ALKYLBEN ZENE, SAID ALKYLBENZENE BEING A MEMBER OF THE GROUPE CONSISTING OF ISOPROPYLBENZENE AND AR-SUBSTITUTED DERIVATIVES THEREOF WHERIN THE AR-SUBSTITUENT IS AN ALKYL RADICAL CONTAINING 1-4 CARBONS ATOMS, SAID VINYL AROMATIC COMPOUND BEING A MEMBER OF THE GROUPE CONSISTING OF STRYENE AND ARSUBSTITUTED DERVATIVES THEREOF WHERIN THE AR-SUBSTITUTE IS A MEMBER OF THE GROUPE CONSISTING OF ALKYL AND ALKOXY RADICALS CONTAINING 1-4 CARBON ATOMS.
Claim 2
Dependent Claim
138 words
A PROCESS FOR MAKING A COPOLYMER OF 10-60 MOL PERCENT OF ACROLEIN AND 90-40 MOL PERCENT OF A VINYL AROMATIC COMPOUND, SAID COPOLYMER HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF 700-10,000. WHICH COMPRISES POLYMERIZING A MIXTURE OF THE MONOMERS AT 180*250*C. UNDER AT LEAST AUTOGENOUS PRESSURE IN THE PRESENCE OF AN AMOUNT OF AN ALKYLBENZENE SUFFICENT AT THE REACTION CONDICTION TO FORM AN ACROLEIN-VINYL AROMATIC COMPOUND-ALKYLBENZENE PRODUCT CONTAINING 1-15 MOL PERCENT OF CHEMICALY COMBINED ALKYLBEN ZENE, SAID ALKYLBENZENE BEING A MEMBER OF THE GROUPE CONSISTING OF ISOPROPYLBENZENE AND AR-SUBSTITUTED DERIVATIVES THEREOF WHERIN THE AR-SUBSTITUENT IS AN ALKYL RADICAL CONTAINING 1-4 CARBONS ATOMS, SAID VINYL AROMATIC COMPOUND BEING A MEMBER OF THE GROUPE CONSISTING OF STRYENE AND ARSUBSTITUTED DERVATIVES THEREOF WHERIN THE AR-SUBSTITUTE IS A MEMBER OF THE GROUPE CONSISTING OF ALKYL AND ALKOXY RADICALS CONTAINING 1-4 CARBON ATOMS.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |