US3684785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cis-1,4-polyisoprene
Assignee: Japanese Geon Co Ltd
•
Filing: 1970-09-15
•
Granted: 1972-08-15
•
Expires: 1990-09-15
Abstract
Abstract In the process for producing cis-1,4-polyisoprene by polymerizing isoprene using a catalyst consisting essentially of an organoaluminum compound and a titanium tetrahalide, the improved process which comprises effecting the polymerization reaction in the presence in the polymerization system of ethylene in an amount not exceeding 8 parts by weight per 100 parts by weight of the isoprene.
Inventors
- 👤 Hiroaki Hasegawa
- 👤 Kouhei Kasai
- 👤 Toshio Namizuka
- 👤 Katsuo Moriguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:37
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/08; Y; Y10; Y10S; Y10S526/00; Y10S526/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The process of claim 1 wherein the molar ratio of titanium to aluminum in said catalyst is 1:0.5-1:3.0.
Claim 2
Dependent Claim
29 words
The process of claim 1 wherein said catalyst is used in an amount that the titanium tetrahalide is present in an amount of 0.1-20 millimols per mol of isoprene.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the polymerization reaction is carried out at a temperature ranging between -5* and 70* C.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the polymerization reaction is carried out in an inert hydrocarbon solvent.
Claim 5
Dependent Claim
19 words
The process of claim 5 wherein the isoprene concentration in the solvent is 10 - 40 percent by weight.
References Cited (Backward Citations)
US3029231A
Cited
US3476721A
Cited
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 |