| 摘要 |
A catalyst composition useful in the preparation of a polymer composition includes a Group VIII metal and a phosphorus bidentate ligand of the general formula (R2)(R4)P-R3-P(R2)(R4) wherein R2 and R4 are optionally polar substituted alkyl groups, differing from each other in carbon number, and wherein R3 is a divalent organic bridging group which contains four atoms. Such catalyst compositions are particularly useful for preparing copolymers of carbon monoxide with alpha -olefins having at least three carbon atoms.
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