The present invention relates to Ziegler-Natta catalyst components for olefin polymerization employing specific carbonate compounds as an element of solid catalyst composition in conjunction with at least one or more internal donor compounds, for producing polyolefins, particularly polypropylene and ethylene-propylene block co-polymer, which exhibits substantially high rubber content with higher stereo-regularity and hydrogen response.

The present invention relates to Ziegler-Natta catalyst components for olefin polymerization employing specific carbonate compounds as an element of solid catalyst composition in conjunction with at least one or more internal donor compounds, for producing polyolefins, particularly polypropylene and ethylene-propylene block co-polymer, which exhibits substantially high rubber content with higher stereo-regularity and hydrogen response.

The invention relates to a pellet comprising a thermoplastic polymer sheath intimately surrounding glass filaments, which glass filaments are covered at least in part with an impregnating agent and extend in a longitudinal direction of said pellets, wherein the thermoplastic polymer sheath is prepared from a thermoplastic polymer composition comprising A) a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer, wherein the heterophasic propylene copolymer has a melt flow rate of at least 40 g/10 min as determined in accordance with ISO 1133 (230° C., 2.16 kg) and a FOG value of at most 350 μg/g as determined by VDA 278, wherein the glass filaments are present in an amount of 10-70 wt % based on the pellet.

The invention relates to a pellet comprising a thermoplastic polymer sheath intimately surrounding glass filaments, which glass filaments are covered at least in part with an impregnating agent and extend in a longitudinal direction of said pellets, wherein the thermoplastic polymer sheath is prepared from a thermoplastic polymer composition comprising A) a heterophasic propylene copolymer consisting of a propylene-based matrix and a dispersed ethylene-α-olefin copolymer, wherein the heterophasic propylene copolymer has a melt flow rate of at least 40 g/10 min as determined in accordance with ISO 1133 (230° C., 2.16 kg) and a FOG value of at most 350 μg/g as determined by VDA 278, wherein the glass filaments are present in an amount of 10-70 wt % based on the pellet.

The present application relates to a process for producing ethylene polymer in a polymerization process comprising polymerisation of ethylene, optionally with comonomers selected from C.sub.3-C.sub.20-alpha-olefins, preferably selected from C.sub.4-C.sub.10-alpha-olefins, in the presence of a Ziegler-Natta catalyst under polymerisation conditions in at least one polymerisation stage carried out in a solution, slurry or gas-phase reactor or in combinations thereof, wherein the Ziegler-Natta catalyst comprises (A) a solid Ziegler-Natta catalyst component and (B) a cocatalyst, wherein the solid Ziegler-Natta catalyst component (A) comprises a solid support of a Mg compound, a transition metal of Group 4 to 6 and an internal electron donor.

The present application relates to a process for producing ethylene polymer in a polymerization process comprising polymerisation of ethylene, optionally with comonomers selected from C.sub.3-C.sub.20-alpha-olefins, preferably selected from C.sub.4-C.sub.10-alpha-olefins, in the presence of a Ziegler-Natta catalyst under polymerisation conditions in at least one polymerisation stage carried out in a solution, slurry or gas-phase reactor or in combinations thereof, wherein the Ziegler-Natta catalyst comprises (A) a solid Ziegler-Natta catalyst component and (B) a cocatalyst, wherein the solid Ziegler-Natta catalyst component (A) comprises a solid support of a Mg compound, a transition metal of Group 4 to 6 and an internal electron donor.

The present invention provides a solid catalyst component for polymerization of an olefin, which appropriately suppresses a decrease in polymerization activity per unit time when having been supplied to the polymerization of the olefin, even without using a phthalic acid ester, and can easily prepare a polymer of an olefin, in which drying efficiency is improved, and a content ratio of a remaining volatile organic compound is greatly reduced in a short period of time. The solid catalyst component for polymerization of an olefin includes magnesium, titanium, halogen and a 1,3-diether compound, wherein a ratio of the 1,3-diether compound contained in the solid catalyst component for polymerization of an olefin is 2.50 to 15.00% by mass, and a specific surface area of the solid catalyst component for polymerization of an olefin is 250 m.sup.2/g or larger.

The present invention provides a solid catalyst component for polymerization of an olefin, which appropriately suppresses a decrease in polymerization activity per unit time when having been supplied to the polymerization of the olefin, even without using a phthalic acid ester, and can easily prepare a polymer of an olefin, in which drying efficiency is improved, and a content ratio of a remaining volatile organic compound is greatly reduced in a short period of time. The solid catalyst component for polymerization of an olefin includes magnesium, titanium, halogen and a 1,3-diether compound, wherein a ratio of the 1,3-diether compound contained in the solid catalyst component for polymerization of an olefin is 2.50 to 15.00% by mass, and a specific surface area of the solid catalyst component for polymerization of an olefin is 250 m.sup.2/g or larger.

The present invention relates to a process for preparation of a catalyst for polymerization of olefins. The catalyst has a particle size of between 5 to 30 microns with activity ranging from 3-4 Kg (co)polymer per g of catalyst and excellent hydrogen response. The method for preparation of the catalyst comprises the steps of: a) contacting a liquid magnesium complex, an electron donor, and a titanium halide compound to form a solution; b) obtaining the solid uniform catalyst particles by precipitation; and c) washing the catalyst particles to obtain solid uniform catalyst., for producing (co)polymer of ethylene with other olefins have fines less than 10 wt.%.

The present invention relates to a process for preparation of a catalyst for polymerization of olefins. The catalyst has a particle size of between 5 to 30 microns with activity ranging from 3-4 Kg (co)polymer per g of catalyst and excellent hydrogen response. The method for preparation of the catalyst comprises the steps of: a) contacting a liquid magnesium complex, an electron donor, and a titanium halide compound to form a solution; b) obtaining the solid uniform catalyst particles by precipitation; and c) washing the catalyst particles to obtain solid uniform catalyst., for producing (co)polymer of ethylene with other olefins have fines less than 10 wt.%.