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    Use of a special propene polymer in the production of heat-sealable films
    12.
    发明专利
    Use of a special propene polymer in the production of heat-sealable films 未知

    公开(公告)号：DE3732933A1

    公开(公告)日：1989-04-13

    申请号：DE3732933

    申请日：1987-09-30

    Applicant: BASF AG

    Inventor： SCHOENE WERNER DR ,  GRUBER WOLFGANG DR ,  DREYER WILHELM DR ,  WERNER RAINER ALEXANDER DR ,  KUCHNER KARL DR ,  HUBER KARL

    IPC: B32B27/32 ,  C08F2/34 ,  C09J123/14

    Abstract: The framework of the invention is the production of heat-sealable films consisting of (i) a basic film of polypropene (polypropylene) and (ii) a heat-sealable layer which is applied to the basic film and comprises a propene polymer with a relatively low softening point. The characteristic feature is that the propene polymers used for the heat-sealable layer are those obtained by continuous production of random copolymers of propene by polymerisation of a monomer mixture by means of a Ziegler-Natta catalyst system in the gas phase in a centric stirred bed comprising small-particulate polymer with removal of the heat of polymerisation by evaporative cooling, the monomer mixture being introduced constantly into the polymerisation zone and the polymer being constantly discharged from the polymerisation zone, with the provisos that (a) in the polymerisation zone pressure and temperature are kept in a range corresponding to the gaseous state of the monomer mixture, (b) gaseous, unconsumed monomer mixture is discharged from the polymerisation zone and reintroduced into the polymerisation zone in the liquid state, (c) the temperature in the polymerisation zone is controlled by means of the amount of liquid monomer mixture introduced per unit time, and (d) the monomer consumed by polymerisation is replaced, with the special feature that - with the use of a monomer mixture comprising principally propene, a little ethene and very little hydrogen - the residence time of the ... Original abstract incomplete.

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