Solid titanium catalyst component, ethylene polymerization catalyst containing the same, and ethylene polymerization process

A solid titanium catalyst component being obtained by a process comprising:

• a step of bridging (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to maintain the contact product (i) at a given temperature (T1) of 105 to 115° C., to which additional organosilicon compound having no active hydrogen (c) is added in an amount of not more than 0.5 mol based on 1 mol of the magnesium compound (a) during the elevation of the temperature from T1—10° C. to T1, or after the completion of the temperature elevation, so as to bring the compound (c) into contact with the contact product (i),
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), and having a catalytic activity of 52,900 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 0.6% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.

A solid titanium catalyst component being obtained by a process comprising:

• a step of bringing (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to a temperature of 105 to 115° C. and maintaining the contact product (i) at this temperature,
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), having a catalytic activity of 49,500 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 1.5% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.

A solid titanium catalyst component being obtained by a process comprising:

• a step of bringing (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to a temperature of 105 to 115° C. and maintaining the contact product (i) at this temperature,
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), having a catalytic activity of 49,700 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 1.5% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.

A solid titanium catalyst component being obtained by a process comprising:

• a step of bringing (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to a temperature of 105 to 115° C. and maintaining the contact product (i) at this temperature,
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), having a catalytic activity of 50,100 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 1.5% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.

A solid titanium catalyst component being obtained by a process comprising:

• a step of bringing (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to a temperature of 105 to 115° C. and maintaining the contact product (i) at this temperature,
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), having a catalytic activity of 52,800 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 1.5% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.

A solid titanium catalyst component being obtained by a process comprising:

• a step of bridging (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a);
• and
• a step of elevating the temperature of the resulting contact product (i) to maintain the contact product (i) as a given temperature (T1) of 105 to 115° C., to which additional organosilicon compound having no active hydrogen (c) is added in an amount of not more than 0.5 mol based on 1 mol of the magnesium compound (a) during the elevation, of the temperature from T1—10° C. to T1, or after the completion of the temperature elevation, so as to bring the compound (c) into contact with the contact product (i),
• said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), and having a catalytic activity of 54,600 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 μm of 0.6% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.