Insulating resin composition for dc power cable, crosslinked resin body, dc power cable, member for forming reinforcing insulating layer of dc power joint, and dc power cable joint

Abstract

An insulating resin composition for a DC power cable improves DC electrical properties and extrusion stability, and includes (A) a low-density polyethylene having a complex viscosity η*, which is measured at 130° C. and a frequency of 100 rad/s, of 600 to 1,300 Pa·s, wherein a ratio (η*/η*) of a complex viscosity η*, which is measured at 130° C. and a frequency of 0.1 rad/s, to the complex viscosity η*is 4 or more; (B) a modified polyethylene; and (C) a stabilizer including a mixture of a hindered phenol antioxidant and a thioether antioxidant. The amount of carbonyl groups introduced into the resin composition through the component (B) is 7×10to 1.3×10mol/g relative to the total mass of the component (A), the component (B), and the component (C).