Monomer‐isomerization polymerization. XI. Monomer‐isomerization copolymerizations of 2‐butene with 2‐pentene and 2‐hexene with Ziegler‐Natta catalyst

Abstract

Abstract2‐Pentene and 2‐hexene were found to undergo monomer‐isomerization copolymerizations with 2‐butene by Al(C2H5)3–VCl3 and Al(C2H5)3–TiCl3 catalysts in the presence of nickel dimethylglyoxime or transition metal acetylacetonates to yield copolymers consisting of the respective 1‐olefin units. For comparison, the copolymerizations of 1‐pentene with 1‐butene and 1‐hexene with 1‐butene by Al(C2H5)3–VCl3 catalyst were also attempted. The compositions of the copolymers obtained from these copolymerizations were determined by using the calibration curves between the compositions of the respective homopolymer mixtures and the values of D766/D1380 in the infrared spectra. The monomer reactivity ratios for the monomer‐isomerization copolymerizations of 2‐butene (M1) with 2‐pentene and 2‐hexene, in which the concentrations of both 1‐olefins calculated from the observed isomer distribution were used as those in the monomer feed mixture, and for the ordinary copolymerizations of 1‐butene (M1) with 1‐pentene and 1‐hexene by Al(C2H5)3‐VCl3 catalyst were determined as follows: 2‐butene (M1)/2‐pentene (M2): r1 = 0.14, r2 = 0.99; 1‐butene (M1)/1‐pentene (M2): r1 = 0.30, r2 = 0.74; 2‐butene (M1)/2‐hexene (M2): r1 = 0.11, r2 = 0.62; 1‐butene (M1)/1‐hexene (M2): r1 = 0.13, r2 = 0.90.