PRODUCTION OF PROPYLENE-BASED BLOCK COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a propylene-based block copolymer including a method for determining by simple means the proportion of the low(non)-crystalline copolymerized portion of the copolymer and capable of controlling by a simple means the above proportion. SOLUTION: This method for producing a propylene-based block copolymer composed of crystalline propylene-polymerized portion and low(non)-crystalline propylene/α-olefin random copolymerized portion includes a method for determining, by a pulse NMR measurement, the respective contents of the low(non)- crystalline propylene/α-olefin random copolymerized portion andα-olefin unit in the final propylene-based block copolymer.