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    PREPARATION OF HOMOPOLYMERS OF COPOLYMERS OF PROPYLENE
    3.
    发明专利
    PREPARATION OF HOMOPOLYMERS OF COPOLYMERS OF PROPYLENE 未知

    公开(公告)号：ZA897037B

    公开(公告)日：1991-06-26

    申请号：ZA897037

    申请日：1989-09-15

    Applicant: BASF AG

    Inventor： RAU WOLFGANG ,  WOLFGANG RAU ,  ZAPF WALTER ,  WALTER ZAPF ,  ZEHNER PETER ,  PETER ZEHNER

    IPC: C08F2/34 ,  C08F4/642 ,  C08F4/651 ,  C08F10/00 ,  C08F10/06 ,  C08F

    Abstract: The invention relates to a process for preparing propylene homo- or copolymers by polymerising the parent monomer by means of a Ziegler- Natta catalyst system comprising (1) a finely divided titanium(III) component based on a cocrystallisate of the formula TiCl3.1/3AlCl3 and obtained by grinding, (2) an alkylaluminium component, and (3), if desired, a further cocatalyst component, in the gas phase in a stirred bed with dissipation of the heat of polymerisation by evaporative cooling, the monomer being introduced into a polymerisation reactor (P) and the polymer being discharged from (P), with the proviso that (a) the pressure and temperature in (P) are kept in a range which corresponds to the gaseous state of the monomer, (b) gaseous monomer not consumed by the polymerisation is discharged from (P), and the monomer is liquefied and stored in a condenser/cooler storage system and reintroduced into (P), (c) the temperature in the stirred bed is regulated by adjusting the amount introduced per time unit of liquid monomer evaporating in (P), and (d) the consumed monomer is replaced by fresh monomer, characterised in that the titanium(III) component (1) of the catalyst system is employed in the form of a relatively low-concentration suspension of the titanium(III) component in a liquid alkane, with the proviso that this suspension has been obtained by first vigorously stirring a very highly concentrated suspension of the titanium(III) component in the alkane for a certain period and is then diluted to the lower concentration using further alkane.

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