US3684761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anionic dispersion polymerization of styrene monomers
Assignee: Union Carbide Corp
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Filing: 1968-08-30
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Granted: 1972-08-15
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Expires: 1988-08-30
Abstract
Abstract High molecular weight polymers are produced by the anionic dispersion polymerization of styrene monomers, particularly Alpha -methylstyrene. The polymerization is carried out at a temperature below the ceiling temperature of the resulting polymer and in the presence of a diluent and a dispersing agent such as poly(vinyl alkyl ether). The diluents employed are those in which the monomer is soluble but in which the polymer is essentially insoluble.
Inventors
- 👤 Guido B Stampa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:13
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F291/00; Y; Y10; Y10S; Y10S524/00; Y10S524/923
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
14 words
The process of claim 1 comprising the following additional step: terminating the livinG polymer.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |