Patent ID: 8252871

Claim:
A catalyst for the oligomerization of ethylene, comprising a functionalized solid support; a ligand immobilized on the solid support by chemical bonding, wherein the immobilized ligand has the structure (R 1 )(R 2 )P—N(R 3 )—P(R 4 )—Y-support or (R 1 )(R 2 )P—N(R 3 )—P(R 4 )—N(R 5 )—P(R 6 )—Y-support, wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are independently selected from aliphatic group, aryl group, amino group or trimethylsilyl group and Y is the functional group of the support or a derivative thereof; and a chromium compound reacted with the ligand.