| 摘要 |
PURPOSE:To obtain the titled coated optical fiber with good transmission characteristics, by coating a low-modulus high water-resistant resin composition comprising a specific polyalkylene glycol modified product and polymerization initiator followed by curing. CONSTITUTION:The objective coated optical fiber can be obtained by coating a resin composition comprising (A) a polyalkylene glycol modified product with its main backbone constituted of condensate from polyalkylene glycol and dibasic acid, having at least two urethane bonds and at least one polymerizable unsaturated group (pref. acryloyl one) at the molecular end(s) {pref. a compound of formula I [R1 is H or group of formula II (R2 is divalent aliphatic or aromatic group; R6 is H or methyl; R7 is divalent aliphatic group), the sum of the number of H and the group of the formula II per molecule is 2, the number of H is 0 or 1, the number of the group of the formula II is 1 or 2; X is group of formula III (R3 is H or methyl; R4 is divalent aliphatic or aromatic group; n and m are each positive integer)]} and (B) a polymerization initiator (pref. photopolymerization initiator) followed by curing. |
