Patent ID: 8808819

Claim:
A tubular member formed of a polyamide resin layer, comprising: carbon black; and a semi-aromatic polyamide resin, the semi-aromatic polyamide resin being a polyamide-polyether block copolymer formed by polymerizing a monomer with a polycondensate of an aromatic dicarboxylic compound and an aliphatic diamine compound with an alkyl carbon number in a range of from 9 to 13; wherein a curve (T-log 10 η curve) indicating a relationship between a temperature (T (° C.)) and a common logarithm (log 10 η) of melt viscosity (η(Pa·s)) at a shear rate of 608 (1/s) in the polyamide resin layer has a slow-sloped region in which a slope (Δ log 10 η/ΔT) of equal to or greater than about −0.010 and equal to or less than about 0 is present in the range of from log 10 200 to log 10 1000, and the temperature range of the slow-sloped region is equal to or higher than about 15° C.