Patent ID: 8342663

Claim:
A resin composition for ink supply tubes, containing: a thermoplastic elastomer (A) containing a (b)-(a)-(b)-type isobutylene triblock copolymer containing polymer blocks (a) having isobutylene units and polymer blocks (b) having styrene units; and a lubricant (B), wherein the content of the thermoplastic elastomer (A) in the resin composition is 70% to 95% by mass, the content of the lubricant (B) in the resin composition is 5% to 15% by mass, the content of the (b)-(a)-(b)-type isobutylene triblock copolymer in the resin composition is 50% to 95% by mass, the content of the polymer blocks (a) in the (b)-(a)-(b)-type isobutylene triblock copolymer is 80% to 90% by mass, and the content of the polymer blocks (b) in the (b)-(a)-(b)-type isobutylene triblock copolymer is 10% to 20% by mass.