Flexible tube for an endoscope, adhesive for an endoscope, endoscope-type medical device, as well as method of producing a flexible tube for an endoscope and method of producing an endoscope-type medical device

A flexible tube for an endoscope, comprising:

• a tubular flexible tube substrate material having a flexibility;
• and
• a resin layer covering the flexible tube substrate material,
• wherein the resin layer is adhered to the flexible tube substrate material with an adhesive hardened,
• wherein the adhesive hardened contains an ester-based polyurethane resin, which is a hardened resin of an adhesive for an endoscope,
• wherein the adhesive for an endoscope contains an ester-based urethane polymer having a structure represented by the following Formula (1):
• wherein R1 and R2 each independently represent an alkyl group, an alkoxy group, an alkylthio group, an aryl group, or a halogen atom;
• n1 and n2 each independently represent an integer of 0 to 4;
• X represents —C(Ra)(Rb)—, —O—, —S—, —SO2—, —C(═O)—, or —N(Rc)—;
• Ra and Rb each independently represent a hydrogen atom, an alkyl group, or an aryl group;
• Rc represents a hydrogen atom or an alkyl group;
• and Ra and Rb may be bonded to each other to form a ring, and
• wherein a surface material of the flexible tube substrate material is an aramid fiber, and
• wherein an equivalent ratio of an urethane segment with respect to a total of an urethane segment equivalent and an ester segment equivalent in the ester-based urethane polymer having a structure represented by the Formula (1) is at least 2% and less than 50%.