Patent ID: 8859450

Claim:
A solid catalyst component for olefin polymerization, comprising titanium atoms, magnesium atoms, halogen atoms and hydrocarbyloxy groups, wherein the solid catalyst component comprises 0.1 to 3.0% by weight of titanium atoms, 5 to 30% by weight of magnesium atoms, 40 to 70% by weight of halogen atoms and 0.1 to 3.5% by weight of hydrocarbyloxy groups, the total weight of the solid catalyst component being 100% by weight, and wherein the following filtrate contains titanium atoms in a concentration of 0.04 mg-Ti/ml-filtrate or lower, measured according to a method comprising the steps of: (1) preparing a suspension of the solid catalyst component for olefin polymerization in heptane at 70° C. having a concentration of 0.1 g-solid catalyst component/ml-suspension; (2) heating the suspension at 70° C. for 30 minutes under stirring; (3) filtering the suspension, thereby obtaining a filtrate; and (4) measuring a concentration of titanium atoms contained in the filtrate by placing 40 ml of the filtrate into a flask, evaporating the heptane contained in the filtrate with a nitrogen gas flow, decomposing the solid catalyst component with about 30 ml of 2 normal (2 N) sulfuric acid, adding 3 ml of hydrogen peroxide-water having a concentration of 3% by weight to prepare a liquid sample, measuring a characteristic absorption of the liquid sample at 410 nm using a double-beam spectrophotometer, and calculating the concentration of titanium atoms in the filtrate based on the characteristic absorption using a calibration curve.