[12] Patent
[11] Patent No.:GC0004568  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/90187
Date of the Decision to Grant the Patent:27/Dec/2016

[21] Application No.:GC 2010-15330

[22] Filing Date:24/2/2010

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- BRITA Diego،2- COLLINA Gianni

[73] Owner: Basell Polyolefine GmbH, Bruhler Strase 60,50389, Wesseling, Germany

[74] Agent: Suleiman I. Al-Ammar Law Office




Int. Cl.: C08F210/16, C08F4/654, C08F2/00 (2006.01)

[56] Cited Documents:

-EP 0 057 420 A2 (SUMITOMO CHEMICAL CO[JP]) 11 August 1982
-GB 1 577 512 A (NIPPON OIL CO LTD)22 October 1980
-EP 0 649 860 A1 (FINA RESEARCH [BE]ATOFINA RES [BE])26 April 1995
-US 4 816 433 A (TERANO MINORU [JP] ET AL)28 March 1989
Examiner: Nouf AlNassban

[57] Abstract: The present invention relates to a slurry method for preparing an ethylene polymer having a melt flow ratio F/P, according to ASTM 1238, of higher than 25, carried out in two or more polymerization stages at temperatures in the range from 60 to 120°C, in which at least two of the two or more polymerization stages are carried out under different concentration of a molecular weight regulator, the method being carried out in the presence of a catalyst system comprising the product obtained by bringing (A) a solid catalyst component comprising Ti, Mg and halogen, and having a porosity (P), measured by the mercury method and due to pores with radius equal to or lower than 1 ?m of at least 0.3 cm/g and a surface area determined by the BET method, of lower than 100 m/g, into contact with (B) an organoaluminum compound.
No. of claims: 10


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