Patent ID: 6130300
Filing Date: 2000-10-10
Classification: C08F

Abstract:
A process for the polymerization of a mixture consisting of at least 80 weight % of ethylene and up to 20 weight % of one or more C.sub.3-12 olefins comprising contacting said monomer mixture in a hydrocarbon solvent at a temperature from 105.degree. C. to 320.degree. C. and a pressure from 4 to 20 mPa with a catalyst consisting essentially of:(i) a mixture of an alkyl aluminum compound of the formula (R.sup.1).sub.3 Al and (R.sup.2).sub.2 Mg, wherein R.sup.1 is a C.sub.1-10 alkyl radical and R.sup.2 is a C.sub.1-10 alkyl radical in a molar ratio of Mg to Al from 4.0:1 to 5.5:1;(ii) a halide of the formula R.sup.3 X, wherein R.sup.3 is a C.sub.1-8 alkyl radical and X is a halide selected from the group consisting of chlorine and bromine;(iii) titanium tetrachloride; and(iv) an alkyl aluminum alkoxide compound of the formula (R.sup.4).sub.2 AlOR.sup.5, wherein R.sup.4 and R.sup.5 are independently selected from the group consisting of C.sub.1-10 alkyl radicals to provide: a molar ratio of Mg:Ti from 4:1 to 5.5:1; a molar ratio of aluminum alkyl to titanium tetrachloride from 1:1 to 1.5:1; a molar ratio of halide to Mg from 1.9:1 to 2.5:1; and a molar ratio of alkyl aluminum alkoxide to titanium from 1.2:1 to 2:1.