Patent ID: 6268443
Filing Date: 2001-07-31
Classification: B01J,C08F,Y10S

Abstract:
A process for producing an olefin polymer or copolymer by gas phase polymerization comprising copolymerizing one or more kinds of olefins in the presence of a catalyst comprising a solid catalyst component a), and b) an organoaluminum compound and optionally, c) an electron donor, said solid catalyst component a) being prepared by spraying a mixture (A) of a magnesium compound with an alcohol in a molten state into a spray column, cooling the inside of the spray column to a temperature at which a solid component (B) is obtained without substantial vaporization of the alcohol in the mixture (A), to obtain the solid component (B), then removing a portion of the alcohol from the solid component (B), to obtain a solid component (C); thereafter contacting a halogen-containing titanium compound and an electron donor with the solid component (C), to obtain a solid component (D), and further contacting a halogen-containing titanium compound with the solid component (D) to obtain a solid catalyst component a), having an average particle diameter of from 90 to 100% of that of the solid component (C)the solid catalyst component a) being obtained by satisfying the following preparation conditions 1 to 4:1. the composition formula of the mixture (A) and the solid component (B) is MgCl.sub.2.multidot.mROH wherein R represents an alkyl group of 1 to 10 carbons and m=3.0 to 6.0;2. the composition formula of the solid component (C) is expressed by MgCl.sub.2.multidot.nROH wherein R represents an alkyl group of 1 to 10 carbons and n=0.4 to 2.8;3. in the X-ray diffraction spector of the solid component (C), a novel peak does not occur at a diffraction angle 2.theta.=7 to 8.degree. as compared with the X-ray diffraction spector of the solid component (B), or even if said peak does occur, the intensity of the novel peak is 2.0 times or less the intensity of the highest peak present in the diffraction angle 2.theta.=8.5 to 9.degree. of the X-ray diffraction spector of the solid component (C); and4. the contact of the halogen-containing titanium compound and the electron donor with the solid component (C) is carried out at a temperature of 110.degree. to 135.degree. C. using an aliphatic hydrocarbon solvent having a boiling point of 90.degree. to 180.degree. C.