US3546194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of alkylating styrene polymers
Assignee: Huels AG
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Filing: 1966-04-19
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Granted: 1970-12-08
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Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 Josef Dasch
- 👤 Anton Schick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC POLYMERS OF ALKYL-SUBSTITUTED STYRENE HAVING HIGH SOFTENING TEMPERATURES, SAID PROCESS COMPRISING: REACTING A POLYMER OF STYRENE SELECTED FROM THE GROUP CONSISTING OF POLYSTYRENE AND COPOLYMERS OF STYRENE WITH A-METHYL-STYRENE WITH TERT-BUTYL CHLORIDE AT 2040*C. IN THE PRESENCE OF CATALYTIC AMOUNTS OF BORON TRIFLUORIDE, THE MOL RATIO OF REACTANTS BEING ABOUT 0.25-1.5 MOL OF TERT.-BUTYL CHLORIDE PER BASIC MOL OF POLYSTYRENE.
Claim 2
Dependent Claim
68 words
IN A PROCESS FOR THE PRODUCTION OF THERMOPLASTIC POLYMERS OF ALKYL-SUBSTITUTED STYRENE HAVING HIGH SOFTENING TEMPERATURES, SAID PROCESS COMPRISING: REACTING A POLYMER OF STYRENE SELECTED FROM THE GROUP CONSISTING OF POLYSTYRENE AND COPOLYMERS OF STYRENE WITH A-METHYL-STYRENE WITH TERT-BUTYL CHLORIDE AT 2040*C. IN THE PRESENCE OF CATALYTIC AMOUNTS OF BORON TRIFLUORIDE, THE MOL RATIO OF REACTANTS BEING ABOUT 0.25-1.5 MOL OF TERT.-BUTYL CHLORIDE PER BASIC MOL OF POLYSTYRENE.
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) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |