US2823201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogenated polymers of nuclear methylated aromatic hydrocarbons, their quaternary ammonium salts and method of making the same
Assignee: Dow Chemical Co
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Filing: 1952-03-10
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Granted: 1958-02-11
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Expires: 1972-03-10
Abstract
No abstract record available.
Inventors
- 👤 Robert M Wheaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A METHOD WHICH COMPRISES REACTING A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, WITH A BENZENE-SOLUBLE POLYMER COMPRISED ESSENTIALLY OF A POLYMERIZED AR-METHYL-MONOVINYL AROMATIC HYDROCARBON OF THE BENZENE SERIES HAVING THE VINYL RADICAL AND FROM ONE TO THREE METHYL RADICALS DIRECTLY ATTACHED TO CARBON ATOMS OF THE AROMATIC NUCLEUS, IN THE PRESENCE OF A HALOGENATION CATALYST PROMOTING THE SUBSTITUTION OF HALOGEN IN THE METHYL RADICALS, WHILE THE POLYMER IS DISSOLVED IN AN INERT ORGANIC LIQUID AT A TEMPERATURE BETWEEN 0* AND 150*C., UNTIL THE POLYMER CONTAINS AN AVERAGE OF FROM 0.3 TO 1.4 SIDE CHAIN HALOGEN ATOMS PER METHYL RADICAL IN THE POLYMER WHEREBY A TOLUENE-SOLUBLE POLYMERIC PRODUCT CONTAINING AT LEAST TO SOME EXTENT CLEAR HALOGENATION IS OBTAINED AND REACTING THE HALOGENATED POLYMER WITH A TETRIARY AMINE TO OBTAIN A WATERSOLUBLE RESINOUS COMPOSITION CONTAINING QUATERNARY AMMONIUM GROUPS.
Claim 2
Independent Claim
140 words
A METHOD WHICH COMPRISES REACTING A HALOGEN SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, WITH A BENZENE-SOLUBLE POLYMER COMPRISED ESSENTIALLY OF A POLYMERIZED AR-METHYL-MONOVINYL AROMATIC HYDROCARBON OF THE BENZENE SERIES HAVING THE VINYL RADICAL AND FROM ONE TO THREE METHYL RADICALS DIRECTLY ATTACHED TO CARBON ATOMS OF THE AROMATIC NUCLEUS, IN THE PRESENCE OF A HALOGENATION CATALYST PROMOTING THE SUBSTITUTION OF HALOGEN IN THE METHYL RADICALS, WHILE THE POLYMER IS DISSOLVED IN AN INERT ORGANIC LIQUID AT A TEMPERATURE BETWEEN 0* AND 150*C., UNTIL THE POLYMER CONTAINS AN AVERAGE OF FROM 0.3 TO 1.4 SIDE CHAIN HALOGEN ATOMS PER METHYL RADICAL IN THE POLYMER WHEREBY A TOLUENE-SOLUBLE POLYMERIC PRODUCT CONTAINING AT LEAST TO SOME EXTENT CLEAR HALOGENATION IS OBTAINED AND REACTING THE HALOGENATED POLYMER WITH A TETRIARY AMINE TO OBTAIN A WATERSOLUBLE RESINOUS COMPOSITION CONTAINING QUATERNARY AMMONIUM GROUPS.
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |