Optical fiber ribbon and optical fiber cable
Provided is an optical fiber ribbon and an optical fiber cable, which are adaptable to manufacture at a high velocity, in the intermittent connecting type optical fiber ribbon obtained by adhering and connecting adjacent colored optical fibers by intermittent connecting portions. In an optical fiber ribbon 2 of the present invention, since, in addition to polyol having a weight average molecular weight in a specific range, rheology control agent is contained in a specific range in a material forming an intermittent connecting portion 3 , the Newtonian region between a low shear rate region and a high shear rate region of the material forming the intermittent connecting portion 3 can be adjusted. Thus, scattering of the material due to a centrifugal force generated by rotation of an application roll that applies the material at the time of manufacture and the like can be suppressed, and the application amount to colored optical fiber 1 can be stabilized. In addition, the optical fiber ribbon 2 can maintain suppression of such scattering and the like even in the manufacture at a high linear velocity.
1. An optical fiber ribbon in which colored optical fibers in which at least two coating layers that coat an optical fiber are formed around the optical fiber, and an outermost layer of the coating layers is colored are arranged in parallel, and the adjacent colored optical fibers are connected by intermittent connecting portions in a length direction,
wherein the intermittent connecting portion contains polyol having a weight average molecular weight of 2,500 to 4,000, and
wherein rheology control agent that shifts the Newtonian region between a low shear rate region and a high shear rate region to the high shear region side is contained in an amount of 1 to 10% by mass with respect to the whole intermittent connecting portion.
2. The optical fiber ribbon according to claim 1 , wherein the intermittent connecting portion contains the polyol in an amount of 4 to 30% by mass with respect to the whole intermittent connecting portion.
3. The optical fiber ribbon according to claim 1 , wherein the rheology control agent is hydrophobic fumed silica.
4. The optical fiber ribbon according to claim 1 , wherein, regarding a viscosity of a material forming the intermittent connecting portion, a viscosity at a shear rate of 10 1 1/s determined from a dynamic viscoelasticity at 25° C. is 3 to 11 Pa·s, and a viscosity at a shear rate of 10 6 1/s determined from the dynamic viscoelasticity at 25° C. is 0.2 to 2.5 Pa·s.
5. The optical fiber ribbon according to claim 4 , wherein a ratio of the viscosity at a shear rate of 10 1 1/s determined from the dynamic viscoelasticity at 25° C. to the viscosity at a shear rate of 10 1 1/s determined from the dynamic viscoelasticity at 35° C. (the viscosity at 25° C./the viscosity at 35° C.) is 3 or less.
6. The optical fiber ribbon according to claim 1 , wherein an adhesive strength between the colored optical fiber and the intermittent connecting portion is 0.07 N or more.
7. An optical fiber cable comprising the optical fiber ribbon according to claim 1 .