| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a corrugated pipe formed in a double layer pipe having an excellent flexibility, flame retardancy, low-temperature shock resistance and a dimensional accuracy by forming in an extruding formation, capable of utilizing characteristic of each layer. SOLUTION: This double layer pipe consists of an inner pipe made of polyethylene, and an outer pipe made by forming a composite vinyl chloride-based resin composition, and the composite vinyl chloride-based resin composition consists of a vinyl chloride-based graft resin made by graft polymerizing 5 to 35 wt.% of an aclilyc based copolymer with 95 to 65 wt.% of a vinyl chloride or a monomer containing vinyl chloride as a main component, and the bending elastic modulus of its press sheet is 6,000 to 25,000 kgf/cm2.</p> |
