Patent ID: 7641753

Claim:
A process for producing a PVC-free multilayer tube free from undesired kinking with more dependable peelability, the process comprising: coextruding a first plastics material, a second plastics material, and a third plastics material; molding a substantially coaxial and cylindrical multilayer tube during the coextruding, wherein the multilayer tube comprises: a base layer bonded to at least one connection layer by at least one buffer layer arranged between the base layer and the at least one connection layer, a thickness of the at least one buffer layer being less than a thickness of the at least one connecting layer; wherein the base layer comprises the first plastics material containing polyolefins in an amount of at least 25% by weight of the base layer, the at least one connection layer comprises the second plastics material containing polyolefins in an amount of at least 25% by weight of the at least one connection layer, and the at least one buffer layer comprises the third plastics material containing a modified polyolefin elastomer in an amount of at least 75% by weight of the at least one buffer layer; and wherein the multilayer tube can be used to form a coil or a loop with a diameter of down to 50 mm without undesirable kinking; and welding the at least one connection layer of the tube to form a peelable coil, such that upon peeling the coil, delamination of the at least one connection layer or delamination of the at least one connection layer and the at least one buffer layer prevents tears from propagating from the at least one connection layer to the base layer.