Patent ID: 7955676

Claim:
A medical tube comprising a propylene polymer composition (A) that comprises a polymer with propylene units, at least part of the polymer having an isotactic structure and the total of the propylene units of the polymer being in an amount of 65 to 82 mol % (the total of the structural units of the polymer in the composition is 100 mol %), that comprises, based on 100 parts by weight thereof: (i) 1 to 40 parts by weight of isotactic polypropylene having an isotactic structure, in which the triad tacticity of the head-to-tail coupled propylene unit sequences as determined by 13 C-NMR is at least 97.0%, and selected from the group consisting of a homopolypropylene and a propylene/α-olefin random copolymer containing α-olefin units in an amount of 0.3 to 5 mol % based on 100 mol % of the total of the structural units in the copolymer; (ii) 60 to 99 parts by weight of a propylene/ethylene/α-olefin random copolymer, in which the head-to-tail coupled propylene unit sequences have an isotactic structure, and the triad tacticity of the head-to-tail coupled propylene unit sequences as determined by 13 C-NMR is at least 95.0%, and comprising 45 to 89 mol % of propylene units, 10 to 25 mol % of ethylene units and optionally 0 to 30 mol % of C4-20 α-olefin units, and that satisfies the following (a1), (a2) and (b1): (a1) the modulus in tension is in the range of 5 to 25 MPa as determined in accordance with JIS K 6301; (a2) the penetration temperature is 120° C. or above as determined in accordance with JIS K 7196; and (b1) when a tube being made of the composition (A) and having an inner diameter of 2.1 mm, an outer diameter of 3.5 mm and a length of 20 cm is looped by inserting both ends thereof into a hollow jig having a hole 10 mm in diameter and 5 mm in height and, then, the both ends of the tube are pulled down until a kink occurs in the loop, the distance H from the upper surface of the jig to the upper end of the loop is not more than 60 mm.