公开(公告)号：US3793295A

公开(公告)日：1974-02-19

申请号：US3793295D

申请日：1970-12-21

Applicant: MONTEDISON SPA

Inventor： LUCIANI L ,  NAVA G ,  FOSCHINI G

IPC: C08F4/64 ,  C08F10/00 ,  B01J11/84 ,  C08F1/56 ,  C08F3/00

CPC classification number: C08F10/00 ,  Y10S526/906 ,  Y10S526/907 ,  C08F4/642 ,  C08F4/651

Abstract: NEW CATALYSTS FOR THE POLYMERIZATION OF OLEFINS ARE DISCLOSED. THE CATALYSTS ARE PREPARED BY CONTACTING AN ALCOHOLIC COMPOUND CONTAINING ONE OR MORE HYDROXY GROUPS WITH DELTA TITANIUM TRICHLORIDE UNDER CONDITIONS SUCH THAT AT LEAST 1% AND PREFERABLY 20%, OF THE FINE POWDERS HAVING A PARTICLE SIZE SMALLER THAN 20 MICRONS, NORMALLY PRESENT IN THE TRICHLORIDE, DISAPPEAR, AND THEN MIXING THE RESULTING PRODUCT WITH AN ALKYL ALUMINUM COMPOUND. ALSO DISCLOSED IS THE USE OF THE NEW CATALYSTS IN THE POLYMERIZATION OF PROPYLENE, BUTENE-1, 4-METHYLPENTENE-1 AD SIMILAR ALPHA-OLEFINS TO HIGHLY ISOTACTIC POLYMERS CHARACTERIZED BY A VERY NARROW GRANULOMETRIC DISTRIBUTION, A LOW CONTENT OF FINE POWDERS, AND A HIGH BULK DENSITY.