Abstract: A method of producing a stabilized fiber, including performing a heat treatment on an acrylamide polymer fiber under an oxidizing atmosphere in a stabilization treatment temperature range of 200° C. to 500° C. while applying a tension of 0.07 mN/tex to 15 mN/tex.

Abstract: The carbon fiber precursor contains a crosslinked acrylamide-based polymer and has a gel fraction of 5% or more.

Abstract: The carbon fiber precursor fiber of the disclosure includes an acrylamide-based polymer fiber; and a self-crosslinked product of a self-crosslinking silicone oil on a surface of the acrylamide-based polymer fiber.

Abstract: A carbon fiber wherein an average fiber diameter of a single fiber is in a range of 3 to 10 ?m, and an average value of an intensity ratio (D/G) of a D peak to a G peak in a Raman spectrum in a cross section perpendicular to a fiber axis direction of the single fiber is 0.90 or less in a region inside a circle having a diameter of 1 ?m and centered at a center of gravity of the cross section of the single fiber, and is 0.90 or less in a region up to 1 ?m inside from an outer periphery of the cross section of the single fiber, wherein the D peak is observed at around 1360 cm?1 and derived from a defect in a graphite structure and the G peak is observed at around 1590 cm?1 and derived from the graphite structure.

Abstract: A carbon fiber precursor fiber bundle includes: acrylamide-based polymer fibers, wherein the carbon fiber precursor fiber bundle contains single fibers having a circular cross section in a proportion of 30 to 100%, wherein the circular cross section has a ratio of a major axis to a minor axis of 1.0 to 1.3 in a cross section orthogonal to a longitudinal direction of the single fiber, and a fineness of the single fiber is 0.1 to 7 dtex.

Abstract: A method of producing a stabilized fiber, including performing a heat treatment on an acrylamide polymer fiber under an oxidizing atmosphere in a stabilization treatment temperature range of 200° C. to 500° C. while applying a tension of 0.07 mN/tex to 15 mN/tex.

Abstract: A power transmission belt having a body with a length, an inside, an outside, and laterally spaced side surfaces. The body has a first rubber composition that includes an organic peroxide used as a cross-linking agent and N,N?-m-phenylenedimaleimide and/or quinone dioxime in an amount of 0.5 to 13 parts by weight per 100 parts by weight of rubber components. The rubber components include (a) ethylene-vinyl ester copolymer and/or an ethylene-?,?-unsaturated carboxylate copolymer, and (b) an ethylene ?-olefin rubber in a ratio of from 5:95 to 100:0 by weight.

Abstract: A power transmission belt having a body with a length, an inside, an outside, and laterally spaced side surfaces. The body has a first rubber composition that includes an organic peroxide used as a cross-linking agent and N,N?-m-phenylenedimaleimide and/or quinone dioxime in an amount of 0.5 to 13 parts by weight per 100 parts by weight of rubber components. The rubber components include (a) ethylene-vinyl ester copolymer and/or an ethylene-?,?-unsaturated carboxylate copolymer, and (b) an ethylene ?-olefin rubber in a ratio of from 5:95 to 100:0 by weight.