Patent US3687913A successfully refreshed from Google Patents.
US3687913A
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Continuous process for the preparation of living polymer
Assignee: Nippon Soda Co Ltd
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Filing: 1970-03-06
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Granted: 1972-08-29
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Expires: 1990-03-06
Abstract
Abstract Conjugated diolefin polymer having a narrow molecular weight distribution and a well coincident value of an average molecular weight with the expected value calculated from a molar ratio of monomer to initiator is continuously produced by employing a tubular reactor having a plural number of monomer inlets, the initiator being passed through from one end to the other end and the monomer diluted with aliphatic or cycloaliphatic hydrocarbon being fed from the monomer inlets, at a temperature maintained between -20* C and -80* C.
Inventors
- 👤 Yutaka Hoshino
- 👤 Yoshikazu Iwaki
- 👤 Koshiro Matsukawa
- 👤 Akira Nakada
- 👤 Fumio Sato
- 👤 Kazuo Uno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:04
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; Y; Y10; Y10S; Y10S526/00; Y10S526/908
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A continuous process for the preparation of living polymer according to claim 1 wherein the diluted monomer is C4 fraction obtained by fractional distillation of cracking gas produced by cracking of petroleum fraction or by dehydrogenation of C4 olefins or C4 paraffins and containing at most 70 percent in weight of butadiene.
Claim 2
Dependent Claim
39 words
Continuous process for the preparation of living copolymer according to claim 2 wherein the diluted monomer consists of the C4 fraction and vinyl comonomer selected from the group consisting of methyl styrene, styrene, methoxy styrene, acrylates, methacrylates and acrylnitril.
Claim 3
Dependent Claim
34 words
Continuous process for the preparation of living polymer according to claim 1 wherein the aliphatic liquid hydrocarbon diluent is selected from the group consisting of petroleum ether, solvent naphtha, gasoline, mineral spirits and kerosene.
Claim 4
Dependent Claim
37 words
Continuous process for the preparation of living copolymer according to claim 1 wherein the diluted monomer consists of conjugated diolefin, vinyl comonOmer selected from the group consisting of methyl styrene, styrene, methoxy styrene, acrylates, methacrylates and acrylnitril.
Claim 5
Dependent Claim
28 words
A continuous process for the preparation of living polymer according to claim 1 wherein average particle size of the dispersed metallic alkali is less than 5 Mu .
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |