| abstract |
(57) [Summary] [Structure] (a) Containing 50 to 95 mol% of propylene units and 5 to 50 mol% of ethylene units, and (b) 13 C- The triad tacticity of the chain portion of the propylene unit consisting of the head-to-tail bond, determined by NMR, is 90.0%. As described above, (c) the proportion of regio-irregular units based on the 2,1-insertion of propylene monomers in the total propylene insertion determined by 13 C-NMR is 0.5% or more, and 3-The proportion of regio-irregular units based on insertion is 0.05% or less, and (d) the intrinsic viscosity measured in decalin at 135 ° C. is in the range of 0.1 to 12 dl / g. Propylene elastomer. [Effect] It has excellent heat resistance, shock absorption, transparency, heat sealability, and blocking resistance. |