| 摘要 |
<p>PURPOSE:To obtain excellent durability, corrosion resistance, softness, heat resistance, and gas-barrier properties by a method wherein an outer layer of a polymeric composition containing ethylene-vinyl acetate copolymer saponified product, and ethylene-vinyl acetate copolymer, and an inner layer of polybutene or the like are bound with an adhesive layer, and the structure is processed by radiation exposure treatment from the outer layer side. CONSTITUTION:A multi-layer pipe is composed of an outer layer or a layer near the outside (the outer layer), an adhesive layer, and an inner layer or a layer near the inside (the inner layer). The outer layer is composed of a polymeric composition containing ethylene-vinyl acetate copolymer saponified product, and ethylene-vinyl acetate copolymer. The inner layer is composed of at least one constituent of polyolefin, water crosslinked polyolefin, and radiation crosslinked polyolefin (polyolefin for inner layer). For example, an inner layer pipe is extruded in a molen state with the polyolefin for inner layer. For water or radiation crosslinked polyolefin, after crosslinking with water or radiation, the adhesive layer is extruded in a molten state on an outer surface, and the polymeric composition is extruded in a molten state to coat that. After manufacturing the multi-layer pipe, it is irradiated with radiation from the outer layer side.</p> |
