Patent ID: 7824020

Claim:
A liquid feed tube for feeding a liquid from a liquid tank disposed on a liquid jetting device body side to a jetting head mounted on a reciprocating carriage, comprising: a long elastic member and a film member connected in an airtight state to the elastic member along a longitudinal direction of the elastic member; and a space part formed by the elastic member and the film member and used as a liquid feed passage, wherein the elastic member is made of a resin composition containing (A) a (b)-(a)-(b) type isobutylene-based triblock copolymer having (a) a polymer block mainly including an isobutylene unit and (b) a polymer block mainly including a styrene unit, (B) an ethylene-based polymer and/or a propylene-based polymer, and (C) a liquid polybutene, and having the following features: (1) an air permeability [JIS K7126; A-method (differential pressure method), 40° C.] measured using a sheet sample with a thickness of 0.5 mm is 200 cm 3 /(m 2 ·24 hr·atm) or less; (2) a moisture permeability (JIS Z0208; 40° C., 90%RH) measured using a sheet sample with a thickness of 0.5 mm is 2.0 g/(m 2 ·24 hr) or less; (3) a hardness [JIS K6253 (15 seconds later) is 30 to 60 degrees in terms of JIS-A hardness; and (4) a melt flow rate [MFR](JIS K7210; 190° C., 52.185 N(5.325 Kgf)) is 100 g/10 minutes or less.