The present invention relates to a process for the continuous preparation of a polyolefin in a reactor from one or more -olefin monomers of which at least one is ethylene or propylene, wherein the reactor comprises a fluidized bed, an expanded section located at or near the top of the reactor, a distribution plate located at the lower part of the reactor and an inlet for a recycle stream located under the distribution plate, wherein the process comprisesfeeding a polymerization catalyst to the fluidized bed in the area above the distribution platefeeding the one or more -olefin monomers to the reactorwithdrawing the polyolefin from the reactorcirculating fluids from the top of the reactor to the bottom of the reactor, wherein the circulating fluids are cooled using a heat exchanger, resulting in a cooled recycle stream comprising liquid, and wherein the cooled recycle stream is introduced into the reactor using the inlet for the recycle stream wherein a stream comprising a thermal run away reducing agent (TRRA-containing stream) is introduced into the expanded section during at least part of the polymerization process, wherein said TRRA-containing stream is brought into contact with at least part of the interior surface of the expanded section.

Provided is a catalyst for polymerization of an olefin which is excellent in sustained polymerization activity in the polymerization of an -olefin and is capable of preferably producing an -olefin (co)polymer having high stereoregularity and MFR and favorable moldability. The present invention provides a catalyst for polymerization of an olefin, comprising: a solid catalyst component containing magnesium, titanium, halogen and an internal electron-donating compound; an organoaluminum compound; and external electron-donating compounds being of two types of alkoxysilane compounds having specific structures represented by the general formula (I) and the general formula (II), respectively, wherein the catalyst for polymerization of an olefin comprises 51 to 99% by mol of the external electron-donating compound represented by the general formula (I) and 1 to 49% by mol of the external electron-donating compound represented by the general formula (II) with respect to the total amount of both the external electron-donating compounds.

Provided is a catalyst for polymerization of an olefin which is excellent in sustained polymerization activity in the polymerization of an -olefin and is capable of preferably producing an -olefin (co)polymer having high stereoregularity and MFR and favorable moldability. The present invention provides a catalyst for polymerization of an olefin, comprising: a solid catalyst component containing magnesium, titanium, halogen and an internal electron-donating compound; an organoaluminum compound; and external electron-donating compounds being of two types of alkoxysilane compounds having specific structures represented by the general formula (I) and the general formula (II), respectively, wherein the catalyst for polymerization of an olefin comprises 51 to 99% by mol of the external electron-donating compound represented by the general formula (I) and 1 to 49% by mol of the external electron-donating compound represented by the general formula (II) with respect to the total amount of both the external electron-donating compounds.

The present invention relates to a solid catalyst for propylene polymerization and a method of producing a propylene polymer or copolymer using the solid catalyst for propylene polymerization, and provides a solid catalyst which prepares a dialkoxymagnesium carrier and is formed of a carrier produced through a reaction of the carrier with a metal halide, a titanium halide, an organic electron donor, etc., and a method of producing a propylene polymer or copolymer through copolymerization of propylene-alpha olefin using the solid catalyst, wherein the dialkoxymagnesium carrier has an uniform particle size range of 10 to 100 m and a spherical particle shape by adjusting injection amounts, injection numbers, and reaction temperatures of metal magnesium, alcohol and a reaction initiator during a reaction process of metal magnesium and alcohol.

The present invention relates to a solid catalyst for propylene polymerization and a method of producing a propylene polymer or copolymer using the solid catalyst for propylene polymerization, and provides a solid catalyst which prepares a dialkoxymagnesium carrier and is formed of a carrier produced through a reaction of the carrier with a metal halide, a titanium halide, an organic electron donor, etc., and a method of producing a propylene polymer or copolymer through copolymerization of propylene-alpha olefin using the solid catalyst, wherein the dialkoxymagnesium carrier has an uniform particle size range of 10 to 100 m and a spherical particle shape by adjusting injection amounts, injection numbers, and reaction temperatures of metal magnesium, alcohol and a reaction initiator during a reaction process of metal magnesium and alcohol.

The invention relates to a production method of a heterophasic propylene polymerization material containing a propylene homopolymer (I-1) or a propylene copolymer (I-2), and a propylene copolymer (II), wherein the content of the propylene copolymer component (II) is 30% by weight or more, the production method containing the following steps (1) and (2):

Step (1): a step of polymerizing a monomer containing propylene in the presence of a catalyst for propylene polymerization to produce a propylene homopolymer (I-1) or a propylene copolymer (I-2), the step satisfying the formula (A):

1100(1.34).sup.1/3(A)

wherein, represents the median diameter (unit: m) of the catalyst for propylene polymerization and represents the production amount (unit: g/g) of the propylene homopolymer (I-1) or the propylene copolymer (I-2) per 1 g of the catalyst for propylene polymerization in the step (1);

Step (2): a step of copolymerizing at least one olefin selected from the group consisting of ethylene and -olefins having the number of carbon atoms of 4 or more and 12 or less, and propylene in the presence of the propylene homopolymer (I-1) or the propylene copolymer (I-2) obtained in the step (1), using 1 or more gas phase polymerization reactors, to produce a propylene copolymer (II), wherein the concentration of alkanes having the number of carbon atoms of 6 or more in the final gas phase polymerization reactor of the 1 or more gas phase polymerization reactors is 0.01% by volume or more and 0.6% by volume or less.

The invention relates to a production method of a heterophasic propylene polymerization material containing a propylene homopolymer (I-1) or a propylene copolymer (I-2), and a propylene copolymer (II), wherein the content of the propylene copolymer component (II) is 30% by weight or more, the production method containing the following steps (1) and (2):

Step (1): a step of polymerizing a monomer containing propylene in the presence of a catalyst for propylene polymerization to produce a propylene homopolymer (I-1) or a propylene copolymer (I-2), the step satisfying the formula (A):

1100(1.34).sup.1/3(A)

wherein, represents the median diameter (unit: m) of the catalyst for propylene polymerization and represents the production amount (unit: g/g) of the propylene homopolymer (I-1) or the propylene copolymer (I-2) per 1 g of the catalyst for propylene polymerization in the step (1);

Step (2): a step of copolymerizing at least one olefin selected from the group consisting of ethylene and -olefins having the number of carbon atoms of 4 or more and 12 or less, and propylene in the presence of the propylene homopolymer (I-1) or the propylene copolymer (I-2) obtained in the step (1), using 1 or more gas phase polymerization reactors, to produce a propylene copolymer (II), wherein the concentration of alkanes having the number of carbon atoms of 6 or more in the final gas phase polymerization reactor of the 1 or more gas phase polymerization reactors is 0.01% by volume or more and 0.6% by volume or less.

The present invention relates to a propylene polymerizing solid catalyst for reducing the volatile organic compound (VOC) and a method of producing polypropylene using the propylene polymerizing solid catalyst, the propylene polymerizing solid catalyst including an organic electron donor formed of a combination of a first internal electron donor of titanium, magnesium, halogen and cyclic diester and a second internal electron donor of diether, and has improved hydrogen reactivity of a catalyst compared to a conventional method and has an effect that is capable of producing an eco-friendly polypropylene which has greatly lowered a content of the VOC by using the catalyst.

The present invention relates to a propylene polymerizing solid catalyst for reducing the volatile organic compound (VOC) and a method of producing polypropylene using the propylene polymerizing solid catalyst, the propylene polymerizing solid catalyst including an organic electron donor formed of a combination of a first internal electron donor of titanium, magnesium, halogen and cyclic diester and a second internal electron donor of diether, and has improved hydrogen reactivity of a catalyst compared to a conventional method and has an effect that is capable of producing an eco-friendly polypropylene which has greatly lowered a content of the VOC by using the catalyst.

Disclosed is a polypropylene with an MFR of at least 20 g/10 min comprising a homopolypropylene and optionally within a range from 2 wt % to 30 wt % of an propylene--olefin copolymer by weight of the polypropylene; wherein the homopolypropylene has a MFR within a range from 30 g/10 min to 200 g/10 min, an Mw/Mn within a range from 7 to 16, and comprising 1.1 wt % or less atactic polypropylene based on the total weight of the homopolypropylene and atactic polypropylene, where the propylene--olefin copolymer has within a range from 30 wt % to 50 wt % -olefin derived units by weight of the propylene--olefin copolymer, and an intrinsic viscosity within a range from 4 to 8 dL/g. The impact copolymer may be obtained by combining a Ziegler-Natta catalyst having at least two different internal electron donors with propylene in reactors in series to produce the homopolypropylene followed by a gas phase reactor to produce a propylene--olefin copolymer.