摘要:
A process for the preparation of a propylene random copolymer, wherein propylene is polymerised with ethylene and/or a C4-C20 alpha-olefin in the presence of a catalyst system comprising solid catalyst particles, wherein the solid catalyst particles (a) have a specific surface area of less than 20 m 2 /g, (b) comprise a transition metal compound which is selected from one of the groups 4 to 10 of the periodic table or a compound of actinide or lanthanide, (c) comprise a metal compound which is selected from one of the groups 1 to 3 of the periodic table, and (d) comprise inclusions not having catalytically active sites.
摘要:
The present invention relates to a heterophasic polypropylene composition with a high melt flow rate for processability, a good stiffness and an improved compression performance. These compositions may be employed for the production of moulded articles, in particular injection moulded articles such as thin-walled plastic cups. Furthermore, the invention relates to a process for preparing the inventive polymer compositions.
摘要:
The invention relates to a process for the production of a propylene homoor copolymer suitable for the production of films and fibres, which process comprises the polymerization of propylene monomers or propylene monomers and one or more types of comonomers in the presence of a high yield Ziegler-Natta olefin polymerization catalyst, which catalyst comprises a component in the form of particles having a predetermined size range which has been produced in a process comprising:
a) preparing a solution of a complex of a Group 2 metal and an electron donor by reacting a compound of said metal with said electron donor or a precursor thereof in an organic liquid reaction medium, b) reacting said complex in solution with a compound of a transition metal to produce an emulsion the dispersed phase of which containing more than 50 mol% of the Group 2 metal in said complex, c) maintaining the particles of said dispersed phase within the average size range of 5 to 200 microns by agitation in the presence of an emulsion stabilizer and d) solidifying said particles, and recovering, optionally washing said particles to obtain said catalyst component.
The invention further relates to the polypropylene products obtainable by this process and to the use of the polypropylene products in the production of films and fibres.
摘要:
Catalyst in form of solid particles, wherein the particles - have a specific surface area of less than 20 m 2 /g, - comprise a transition metal compound which is selected from one of the groups 4 to 10 of the periodic table (IUPAC) or a compound of actinide or lanthanide, - comprise a metal compound which is selected from one of the groups 1 to 3 of the periodic table (IUPAC), and - comprise solid material, wherein the solid material • does not comprise catalytically active sites, • has a specific surface area below 500 m 2 /g, and • has a mean particle size below 200 nm.
摘要:
Catalyst in form of solid particles, wherein the particles - have a specific surface area of less than 20 m 2 /g, - comprise a transition metal compound which is selected from one of the groups 4 to 10 of the periodic table (IUPAC) or a compound of actinide or lanthanide, - comprise a metal compound which is selected from one of the groups 1 to 3 of the periodic table (IUPAC), and - comprise solid material, wherein the solid material • does not comprise catalytically active sites, • has a specific surface area below 500 m 2 /g, and • has a mean particle size below 200 nm.