Patent US3070574A successfully refreshed from Google Patents.
US3070574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for graftpolymerizing alphamethylstyrene in the presence of cyclic ethers and alkali metal catalyst
Assignee: BASF SE
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Filing: 1959-04-13
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Granted: 1962-12-25
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Expires: 1979-04-13
Abstract
No abstract record available.
Inventors
- 👤 Kastning Ernst-Guenther
- 👤 Bronstert Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:47
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT LINEAR GRAFT COPOLYMERS OF ALPHA-METHYLSTYRENE WHICH COMPRISES: POLYMERIZING ALPHA-METHYLSTYRENE AT A TEMPERATURE BETWEEN -100*C. AND +60*C. IN THE PRESENCE OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS AND ALKALI METAL HYDRIDES AND IN THE PRESENCE OF A CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURANE AND DIOXANE; ADDING TO THE REACTION MIXTURE A POLYMERIZABLE MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, NUCLEAR ALKYLATED STYRENE, BUTADIENE, ISOPRENE, AND VINYLCARBAZOLE; AND THEREAFTER COPOLYMERIZING SAID POLYMERIZABLE MONOMER AND SAID POLYMER OF ALPHA-METHYLSTYRENE WHEREBY A LINEAR GRAFT COPOLYMER IS OBTAINED, THE AMOUNT OF POLYMERIZABLE MONOMER ADDED TO SAID ALPHA-METHYLSTYRENE POLYMER BEING SUCH THAT AT LEAST 20% BY WEIGHT OF SAID LINEAR GRAFT COPOLYMER IS MADE UP OF ALPHA-METHYLSTYRENE.
Claim 2
Dependent Claim
128 words
A PROCESS FOR THE PRODUCTION OF HIGH MOLECULAR WEIGHT LINEAR GRAFT COPOLYMERS OF ALPHA-METHYLSTYRENE WHICH COMPRISES: POLYMERIZING ALPHA-METHYLSTYRENE AT A TEMPERATURE BETWEEN -100*C. AND +60*C. IN THE PRESENCE OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS AND ALKALI METAL HYDRIDES AND IN THE PRESENCE OF A CYCLIC ETHER SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURANE AND DIOXANE; ADDING TO THE REACTION MIXTURE A POLYMERIZABLE MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, NUCLEAR ALKYLATED STYRENE, BUTADIENE, ISOPRENE, AND VINYLCARBAZOLE; AND THEREAFTER COPOLYMERIZING SAID POLYMERIZABLE MONOMER AND SAID POLYMER OF ALPHA-METHYLSTYRENE WHEREBY A LINEAR GRAFT COPOLYMER IS OBTAINED, THE AMOUNT OF POLYMERIZABLE MONOMER ADDED TO SAID ALPHA-METHYLSTYRENE POLYMER BEING SUCH THAT AT LEAST 20% BY WEIGHT OF SAID LINEAR GRAFT COPOLYMER IS MADE UP OF ALPHA-METHYLSTYRENE.
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) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |