Patent US3304294A successfully refreshed from Google Patents.
US3304294A
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Process for acylation of alkenyl aromatic polymers
Assignee: Dow Chemical Co
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Filing: 1964-02-24
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Granted: 1967-02-14
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Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Leavitt
- 👤 Priscilla A Carney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:33
CPC Classifications
C; C08; C08F; C08F8/00; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
THE PROCESS FOR SOLVENT-FREE ACYLATION OF AN AROMATIC POLYMER COMPRISING THE STEPS OF BLENDING A DRY POWDER OF THE AROMATIC POLYMER WITH AN ANHYDROUS POWDERED ACYLATION CATALYST SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE AND ALUMINUM BROMIDE TO FORM AN INTIMATE MIXTURE THEREOF, THEREAFTER PASSING THROUGH SAID INTIMATE MIXTURE A VAPORIZED ACYLATING AGENT AND RETAINING SAID THREE COMPONENTS IN ADMIXTURE AT A TEMPERATURE IN THE RANGE OF 0-100*C. FOR A PERIOD SUFFICIENT TO EFFECT ACYLATION OF SAID AROMATIC POLYMER, SAID AROMATIC POLYMER BEING SELECTED FROM THE CLASS CONSISTING OF POLYMERS OF AN ALKENYL AROMATIC COMPOUND HAVING AT LEAST FOUR AROMATIC NUCLEAR POSITIONS UNSUBSTITUTED, AND SAID ACYLATING AGENT HAVING A FORMULA SELECTED FROM THE CLASS CONSISTING OF: H2C=CH-CO-X, X-CH2-CH2-CO-X AND H3C-CH(-X)-CO-X WHERE X REPRESENTS AN HALOGEN ATOM.
Claim 2
Dependent Claim
127 words
THE PROCESS FOR SOLVENT-FREE ACYLATION OF AN AROMATIC POLYMER COMPRISING THE STEPS OF BLENDING A DRY POWDER OF THE AROMATIC POLYMER WITH AN ANHYDROUS POWDERED ACYLATION CATALYST SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE AND ALUMINUM BROMIDE TO FORM AN INTIMATE MIXTURE THEREOF, THEREAFTER PASSING THROUGH SAID INTIMATE MIXTURE A VAPORIZED ACYLATING AGENT AND RETAINING SAID THREE COMPONENTS IN ADMIXTURE AT A TEMPERATURE IN THE RANGE OF 0-100*C. FOR A PERIOD SUFFICIENT TO EFFECT ACYLATION OF SAID AROMATIC POLYMER, SAID AROMATIC POLYMER BEING SELECTED FROM THE CLASS CONSISTING OF POLYMERS OF AN ALKENYL AROMATIC COMPOUND HAVING AT LEAST FOUR AROMATIC NUCLEAR POSITIONS UNSUBSTITUTED, AND SAID ACYLATING AGENT HAVING A FORMULA SELECTED FROM THE CLASS CONSISTING OF: H2C=CH-CO-X, X-CH2-CH2-CO-X AND H3C-CH(-X)-CO-X WHERE X REPRESENTS AN HALOGEN ATOM.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |