Supported, titanized chromium catalyst and its use for preparing homopolymers and copolymers of ethylene

A homopolymer of ethylene or a copolymer of ethylene with α-olefins obtained by a process comprising polymerizing ethylene or mixtures of ethylene and α-olefins in the presence of at least one supported, titanized chromium catalyst obtained by a process comprising:

• A) bringing a spherical, spray-dried, oxidic support material into contact with a titanium compound in a suspension,
• B) bringing the support material which has been treated in this way into contact with a chromium salt solution in a suspension and subsequently removing the solvent,
• C) if desired, calcining the precatalyst obtained in step B) at above 280° C. in an inert gas atmosphere and subsequently
• D) activating the precatalyst obtained in step B) or C) at from 500° C. to 800° C. in an oxygen-containing atmosphere.

A homopolymer or copolymer of ethylene with α-olefins obtained by a process comprising polymerizing ethylene or mixtures of ethylene and α-olefins in the presence of at least one supported, titanized chromium catalyst obtained by a process comprising:

• A) bringing a spherical, spray-dried, oxidic support material into contact with a titanium compound in a suspension,
• B) bringing the support material which has been treated in this way into contact with a chromium salt solution in a suspension and subsequently removing the solvent,
• C) if desired, calcining the precatalyst obtained in step B) at above 280° C. in an inert gas atmosphere and subsequently
• D) activating the precatalys obtained in step B) or C) at from 500° C. to 800° C. in an oxygen-containing atmosphere,
• wherein said homopolymer or copolymer has an HLMI of from 1 to 50 g/10 min, an MFI (190° C./2.16 kg) of from 0 to 10 g/10 min, a density of from 0.9 to 0.97 g/cm3 and a molar mass distribution Mw/Mn in the range from 3 to 50.