US3625870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the haloalkylation of cross-linked styrene copolymers
Assignee: Sybron Transition Corp
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Filing: 1969-03-04
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Granted: 1971-12-07
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Expires: 1989-03-04
Abstract
Abstract Haloalkylated aromatic compounds including polymers and copolymers having at least one substitutable nuclear hydrogen per aromatic nucleus are produced by reacting said compounds with an excess of a haloalkylating agent in the presence of a haloalkylating catalyst and zirconium tetrachloride.
Inventors
- 👤 Amos Norwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
The process of claim 1 wherein said haloalkylating agent is chloromethyl methyl ether.
Claim 2
Dependent Claim
58 words
The process of claim 1 wherein said reaction mixture is agitated and maintained at a temperature of about 0* C. to about 70* C. while adding said zirconium tetrachloride and thereafter said reaction mixture, including said zirconium tetrachloride, is maintained, with agitation at said temperature for a sufficient period to allow for substantial completion of said chloromethylation reaction.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein after the addition of zirconium tetrachloride said reaction mixture is maintained at a temperature of about 60* C. for about 1 hour.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein upon completion of said chloromethylation reaction said chloromethylated reaction product is aminated.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |