Organometallic catalyst composition for polymerization of ethylene
Patents
| Language: |
Немецкий |
| Type: |
Invention |
| Number |
DD 257926 A3 |
| Request number: |
19840262670 |
| Request date: |
May 4, 1984 |
| patent.field.start_date: |
|
| Registration date: |
Jul 6, 1988 |
| patent.field.request_publication_date: |
|
| Authors |
Zacharov V.A.
,
Ivanova T.M.
,
Nikitin V.E.
,
Machtarulin S.I.
,
Brederik H.
,
Grigorev V.A.
,
Fogt H.
,
Ermakov Yu.I.
,
Ivancev S.S.
,
Akmalova O.K.
,
Oswald L.
,
Semenova A.S.
,
Kerrinnes H.
,
Korotkov S.I.
,
Stefanovic L.G.
|
| Affiliations |
| 1 |
Institut Kataliza, 630090 Novosibirsk, ul. Akad. Lavrenteva, d.5, SU
|
| 2 |
SKTB Katalizatorov, 630058 Novosibirsk, ul. Tichaja, d.1, SU
|
| 3 |
ONPO "Plastpolimer", 195108 Leningrad, Poljustrovskij pr., d.32, SU
|
| 4 |
VEB Combinat Chemische Werke Buna, Schkopau, 4212, DD
|
|
A catalyst for the polymn. of ethylene (I), forming polyethylene (II) having increased melt index and narrow mol. wt. distribution, comprises TiCl4 4.4-10.0, THF 0.7-5.7 wt.%, and MgmClnCpHq support (m = 0.8-0.95, n 1.60-1.90, p = 0.60-1.60, and q 1.4-3.4) making up the balance to 100 wt.%. The catalyst is used for the low-pressure suspension polymn. of I in the presence of a trialkylaluminum cocatalyst in a hydrocarbon diluent at 50-100° and 1-40 atm pressure. Thus, the catalyst support having the compn. Mg0.8Cl1.6C0.6H1.4 (III) was prepd. by reacting Mg in C6H14 with BuCl in the presence of I at 65-68° for 2 h. Then, 7.5 g suspension in 100 mL C6H14 was mixed with 0.30 mL THF and 0.41 mL TiCl4 in 10 mL C6H14 at 30-35° to give, after decantation and drying, 8.2 g solid catalyst contg. 2.0 wt.% Ti and 3.3 wt.% THF. The polymn. of I in C6H14 in the presence of 0.25 g/L AlEt3 cocatalyst at 80° for 1 h gave II having melt index (at 190°) 6.7 g/10 min, compared with 1.6 g/10 min for II prepd. without THF.