PROPYLENE RANDOM BLOCK COPOLYMER, RESIN COMPOSITIONS CONTAINING THE COPOLYMER, AND MOLDINGS OF BOTH

摘要

The invention provides a propylene random block copolymer (A) that has a melt flow rate from 0.1 to 100 g/10 min and a melting point from 100 to 155°C and includes 90 to 60% by weight of a portion insoluble (D insol ) in n-decane at room temperature and 10 to 40% by weight of a portion soluble (D sol ) in n-decane at room temperature, wherein the D insol satisfies the following requirements (1) through (3) and the D sol satisfies the following requirements (4) through (6). The invention further provides molded articles such as sheets, films, injection molded articles, hollow molded articles, injection blow molded articles and fibers, which are formed of the propylene random block copolymer (A) or a propylene resin composition containing the propylene random block copolymer (A). (1) The molecular weight distribution (Mw/Mn) obtained by GPC of the D insol is from 1.0 to 3.5, (2) the content of skeletons derived from ethylene in the D insol is from 0.5 to 13% by mole, (3) the total amount of 2,1- and 1,3-propylene units in the D insol is 0.2% by mole or less, (4) the molecular weight distribution (Mw/Mn) obtained by GPC of the D sol is from 1.0 to 3.5, (5) the intrinsic viscosity [·] in decalin at 135°C of the D sol is from 1.5 to 4 dl/g and (6) the content of skeletons derived from ethylene in the D sol is from 15 to 35% by mole.