Abstract
AlEt3Cl was modified with TLTTP (trilauryltrithiophosphite) in the catalyst system consisting of TiCl3 and AlEt2Cl. The effects of TLTTP on the polymerization of propylene were studied in comparison with those of alkyl homologues of TLTTP. The catalytic behavior of the TiCl3–AlEt2Cl-TLTTP catalyst system in the polymerization of propylene was also studied in comparison with that of the TiCl3–AlEt2Cl catalyst system. In the study of the effect of various alkylthiophosphites added, it is found that the bulkiness of the alkyl group affects the rate of propylene polymerization and the stereoregularity of the resultant polymers. The TiCl3–AlEt2Cl–TLTTP catalyst system gave different catalytic behavior in the propylene polymerization from that of the unmodified conventional catalyst system (TiCl3–AlEt2Cl). These effects of TLTTP were considered to be due to the bulkiness of the alkyl groups attached to the phosphorous atom and the higher reactivity to TiCl3 of the modified AlEt2Cl than of the unmodified AlEt2Cl.
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