US3893989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing propylene
Assignee: Montedison SpA
•
Filing: 1973-10-09
•
Granted: 1975-07-08
•
Expires: 1993-10-09
Abstract
Abstract A method of polymerizing propylene to obtain a polymer having a high apparent density which comprises first polymerizing propylene in the liquid phase at relatively low temperature in the presence of a catalyst system which is the reaction product of violet crystallline TiCl3 and an organo aluminum compound, followed by further polymerization of propylene in the liquid phase at a higher temperature.
Inventors
- 👤 Giorgio Leicht
- 👤 Alberto Tanchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; Y; Y10; Y10S; Y10S526/00; Y10S526/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
A METHOD FOR PREPARING DENSITY COMPRISING POLYMERIZING MERS HAVING A HIGH BULK DENSITY COMPRISING POLYMERIZING PROPYLENE IN THE LIQUID PHASE AT A TEMPERATURE OF FROM ABOUT 40* TO 90*C IN THE PRESENCE OF (1)A CATALYTIC SYSTEM WHICH IS THE REACTION PRODUCT OF: A. VIOLET CRYSTALLINE TITANTIUM TRICHLORIDE OBTAINED BY REDUCING TITANIUM TETRACHLORIDE WITH AN ALUMINUM ALKYL COMPOUND AND B. AN ORGANIC ALUMINUM COMPOUND OF THE FORMULA
Claim 2
Independent Claim
66 words
A METHOD FOR PREPARING DENSITY COMPRISING POLYMERIZING MERS HAVING A HIGH BULK DENSITY COMPRISING POLYMERIZING PROPYLENE IN THE LIQUID PHASE AT A TEMPERATURE OF FROM ABOUT 40* TO 90*C IN THE PRESENCE OF (1)A CATALYTIC SYSTEM WHICH IS THE REACTION PRODUCT OF: A. VIOLET CRYSTALLINE TITANTIUM TRICHLORIDE OBTAINED BY REDUCING TITANIUM TETRACHLORIDE WITH AN ALUMINUM ALKYL COMPOUND AND B. AN ORGANIC ALUMINUM COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said low temperature polymerization is less than 30*C.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the propylene polymerizations are carried out in the presence of a hydrocarbon solvent.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the propylene polymerizations are carried out in the absence of a hydrocarbon solvent.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein said violet crystalline titanium trichloride is obtained by reducing titanium tetrachloride with an aluminum alkyl halide.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein component (b) of the catalytic system is aluminum diethyl monochloride.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said low temperature polymerization of propylene is carried out at from about 15* to 25*C.
Claim 9
Dependent Claim
28 words
The method of claim 1 wherein the amount of propylene polymerized at the low temperature represents from 0.05 to 15 percent by weight of the total polymer obtained.
References Cited (Backward Citations)
US3035037A
Cited
US3649579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |