Patent ID: 6034189
Filing Date: 2000-03-07
Classification: C08F

Abstract:
A process for olefin polymerization comprising polymerizing olefins having 2 to 20 carbon atoms at a temperature of about 20 to 300.degree. C. and at a pressure of from atmospheric pressure to 100 kg/cm.sup.2 in the presence of an olefin polymerization catalyst comprising the following components (I), (II) and (III);(I) a solid titanium catalyst component which comprisesmagnesium,titanium,halogen,(C) a phthalic diester represented by the following formula (i), ##STR12## wherein R is a branched hydrocarbon group having a total of seven carbon atoms and being substituted with at least one branched methyl substituent, and two of Rs may be the same as or different from each other, and(D) an electron donor other than the phthalic diester (C),wherein said solid titanium catalyst component (I) is obtained by contacting a hydrocarbon solution of a magnesium compound (A) with a titanium compound (B) in a liquid state to form a solid product or first preparing a hydrocarbon solution of the magnesium compound (A) and the titanium compound (B) and then forming a solid product therefrom,said reaction of forming the solid product being carried out in the presence of at least one electron donor (D-2) as said electron donor (D), which is selected from the group consisting of mono-carboxylic acid esters, aliphatic carboxylic acids, acid anhydrides, ketones, ethers, alkoxy group containing alcohols, aliphatic carbonates, organic silicone compounds and organic phosphorous compounds having a P--O--C bond, andafter the formation of the solid product, contacting the solid product with the phthalic diester (C),said contact of the magnesium compound (A) with the titanium compound (B) being carried out at a sufficiently low temperature and thereafter elevating the temperature to 87.degree. C. to 95.degree. C., where the amount of said at least one electron donor (D-2) is 0.01 to 1.0 mole per mole of the magnesium compound (A) and the amount of said phthalic diester (C) is 0.05 to 0.5 mole per mole of the magnesium compound (A);(II) an organometallic compound catalyst component represented by the following formula,R.sup.a.sub.n AlX.sub.3-nwherein R.sup.a is a hydrocarbon group of 1 to 12 carbon atoms, X is halogen or hydrogen, and n is 1 to 3; and(III) an electron donor represented by the following formula,R.sub.n Si(OR').sub.4-nwherein R and R' are each a hydrocarbon group, and 0<n<4, or a polyether;wherein the amount of the solid catalyst component (I) is 0.001 to 100 mmol, in terms of Ti atom, based on 1 liter of the polymerization volume, the amount of metal atom in the organometallic compound catalyst component (II) is in the range of 1 to 2000 mole, based on 1 mole of the titanium atom in the solid catalyst component (I), and the amount of the electron donor (III) is 0.001 to 10 mole, based on 1 mole of the metal atom in the organometallic compound catalyst component (II); andwherein said contact of the magnesium compound (A) with the titanium compound (B) is carried out at a sufficiently low temperature and thereafter elevating the temperature to 87.degree. C. to 95.degree. C., wherein the temperature is maintained to 87.degree. C. to 95.degree. C. upon the addition of the phthalic diester (C).