Patent ID: 6977105

Claim:
A tube consisting of an inner, intermediate and outer resin layer, wherein the inner and outer layers are made of resin (II) and the intermediate layer is formed of resin (I), wherein resin (I) comprises: (a) 5 to 40 mass % of a polypropylene resin and (b) 95 to 60 mass % of at least one hydrogenated copolymer selected from the group consisting of: (i) a first hydrogenated block copolymer comprising a hydrogenated block copolymer formed of (A) a polymer block from a vinyl aromatic compound and (B) an isoprene polymer block, and the isoprene polymer block (B) having a 1,2-bond and 3,4-bond content of 10 to 75 mol %, (ii) a second hydrogenated block copolymer comprising a hydrogenated block copolymer formed of said (A) polymer block from a vinyl aromatic compound and (C) a polymer block from isoprene and butadiene, and the polymer block (C) having a 1,2-bond and a 3,4-bond content of 20 to 85 mol %, (iii) a third hydrogenated block copolymer comprising a hydrogenated block copolymer formed of said (A) polymer block from a vinyl aromatic compound and a butadiene polymer block, and the polymer block (D) having a 1,2-bond content of at least 30 mol %, and resin (II) comprises: (a′) 45 to 100 mass % of a polypropylene resin and (b′) 55 to 0 mass % of the above at least one hydrogenated copolymer, wherein resin (II), which forms the outer layer contains 45 to 70 mass % of the polypropylene resin and 55 to 30 mass % of the at least one hydrogenated copolymer, wherein resins (I) and (II) do not contain random copolymer, wherein said tube has (i) a tube/tube a shear peel strength of less than 35 N, as measured on a stuck or adhered portion of the outermost layer of one said tube against the outermost layer of another said tube after autoclave sterilization at 121° C. for 20 minutes, and has (ii) a tube/film 180° peel strength of less than 10 N, as measured on a stuck or adhered portion of the outermost layer of said tube and an innermost polypropylene layer of a sterilization bag, by the test method defined in JIS K6854 after autoclave sterilization at 121° C. for 20 minutes, wherein said resin (I) forms a thick substrate layer and resin (II) forms a connection layer thinner than the substrate layer, the connection layer being capable of connecting to another tube or article by hot melt bonding, solvent bonding or adhesive bonding, wherein said tube can form an arc having a radius of 20 mm without kinking, thereby the tube showing good resistance against tube/tube sticking and tube/film sticking after high-pressure steam sterilization.