Comonomer sequence distribution in metallocene-based ethylene/1-butene (S-34) and ethylene/1-hexene (S-43) copolymers

Metallocene based polyethylenes were prepared by SMOPEC's "metallocene addu ct" technology in a gas phase fluidized bed model reactor. The C-13-NMR spe ctra of ethylene/1-butene (S-34) and ethylene/1-hexene(S-43) copolymers wer e studied in a manner analogous to that established by Hsieh and Cheng. The comonomer sequence distributions of copolymer samples were obtained. The r esults show that these metallocene based copolymers contain a small amount of butene and hexene, and the EE and EEE sequences are dominant.