US3684781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjusting the viscosity of polyalkenamers
Assignee: Bayer AG
•
Filing: 1970-04-06
•
Granted: 1972-08-15
•
Expires: 1990-04-06
Abstract
Abstract The molecular weight of cycloolefin polymers is adjusted by effecting the catalytic polymerization of cycloolefins in organic solvents in the presence of from 0.001 to 1 percent of an 1olefin.
Inventors
- 👤 Karl Nutzel
- 👤 Friedrich Haas
- 👤 Gunter Marwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:11
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; Y; Y10; Y10S; Y10S526/00; Y10S526/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
The process of claim 1 wherein said cycloolefin is cyclopentene.
Claim 2
Dependent Claim
27 words
The process of claim 1 wherein dicyclopentadiene, norbornadiene or norbornene is used as an additional monomer in an amount of from 0.05 to 5 percent by weight.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said 1-olefin is ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene or styrene.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein said Friedel-Crafts catalyst is WCl6, BF3, WCl4, MoCl5, WCl6, or Ta Cl5.
References Cited (Backward Citations)
US3029231A
Cited
US3385840A
Cited
US3458489A
Cited
US3459725A
Cited
US3449310A
Cited
US3476728A
Cited
US3598796A
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 |