| abstract |
PROBLEM TO BE SOLVED: To produce a trimer with good catalytic efficiency and selectivity in low polymerization of an α-olefin using a chromium-based catalyst. SOLUTION: A catalyst prepared from a chromium compound (a), a nitrogen-containing compound (b) selected from the group consisting of amines, amides and imides, an alkylaluminum compound (c) and a halogen-containing compound (d) is used. The reaction is performed in a continuous reaction mode and the chromium concentration in the reaction zone is 1 ppm or less. |