Patent ID: 11892104
Assignee: FUJIFILM CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC F  A  B  C | IPC A  B  C  F

Claim 0:
1. An endoscope flexible tube having a cylindrical flexible tube base that has flexibility and a resin layer that coats the flexible tube base,
wherein the resin layer, which is a single layer or multiple layers of two or more layers, comprises a layer A which comprises:
a resin component, and
both a hindered phenol compound and a hindered amine compound,
wherein the resin component comprises polyester elastomers, and at least one of polyurethane elastomers or polyamide elastomers,
wherein the content of the polyester elastomers in the resin component of the layer A is 55 mass % or more,
wherein the hindered phenol compounds have structure sites represented by the following Formula (1),, where, R1 and R2 each independently indicate a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an aralkyl group having 7 to 36 carbon atoms, and * indicates a bonding position,
wherein the hindered amine compounds are compounds which have repeating units represented by Formula (2-2),, where, R3 to R6 each independently indicate a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, R7 indicates a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or —OR8, R8 indicates a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, r represents an integer, Q represents an (s+2)-valent linking group, and s represents 1 or 2, and
wherein a total amount of the hindered phenol compounds and the hindered amine compounds ranges from 0.01 to 7 parts by mass with respect to 100 parts by mass of the resin component in the layer A of the resin layer.