Patent ID: 8923681
Filing Date: 2014-12-30
Classification: C03C,G02B

Abstract:
1. An optical fiber core comprising a primary layer and a secondary layer, which are laminated on a bare optical fiber, wherein the primary layer is formed by curing an ultraviolet-curable resin composition containing a first silane coupling agent, which can be incorporated into a resin skeleton, and a second silane coupling agent, which cannot be incorporated into a resin skeleton, the first silane coupling agent contains a compound having a methoxy group, the second silane coupling agent contains a compound having an ethoxy group, the first silane coupling agent and the second silane coupling agent are contained in the ultraviolet-curable resin composition, which forms the primary layer, and where A is a value obtained by multiplying a molar concentration of the first silane coupling agent by a number of alkoxyl groups existing in one molecule of the first silane coupling agent, B is a value obtained by multiplying a molar concentration of the second silane coupling agent by a number of alkoxyl groups existing in one molecule of the second silane coupling agent, and C is a water absorption rate of the secondary layer, a point plotted on a two-dimensional coordinate [(horizontal, and vertical axes)=(C, A+B)] is presented within an area defined by the four points, P