The present invention provides a curable liquid resin composition which, when cured, exhibits excellent removability from an adjacent coating layer and is suitable as an optical fiber upjacket material. The curable liquid resin optical fiber upjacket composition comprising a urethane(meth)acrylate or a (meth)acrylate oligomer containing two or more (meth)acryloyl groups, a reactive diluent, a polymerization initiator, and a urethane(meth)acrylate compound containing at least one (meth)acryloyl group and selected from (D1) to (D4) shown by the following general formula (1). (DI) In the formula (1), R
1
represents a methyl group, R
2
and R
3
individually represent a divalent organic group, and R
4
represents a monovalent organic group. (D2) In the formula (1), R
1
represents a hydrogen atom, R
2
and R
3
individually represent divalent organic groups, and R4 represents a polyol residue having a molecular weight of 1500 or more. (D3) In the formula (1), R
1
represents a hydrogen atom or a methyl group, R
2
and R
3
individually represent divalent organic groups, and R
4
represents a silicone residue having a molecular weight of 1000 to 30000. (D4) In the formula (1), R
1
represents a hydrogen atom, R
2
and R
3
individually represent divalent organic groups, and R
4
represents a polyol monoalkyl ether residue having a molecular weight of 500 to 20000.
本发明提供了一种可固化的液体
树脂组合物,当固化后,从相邻的涂层层面中容易去除,并适用于光纤上套材料。该可固化液体
树脂光纤上套组合物包括一种含有两个或更多个(meth)acryloyl基团的聚
氨酯(meth)
丙烯酸酯或(meth)
丙烯酸酯低聚物、一种反应性稀释剂、一种聚合
引发剂,以及一种含有至少一个(meth)acryloyl基团的聚
氨酯(meth)
丙烯酸酯化合物,该化合物从(D1)到(
D4)中选出,如下所示的通式(1)。(DI)在式(1)中,R1表示甲基基团,R2和R3分别表示二价有机基团,R4表示一价有机基团。(D2)在式(1)中,R1表示氢原子,R2和R3分别表示二价有机基团,R4表示分子量为1500或更高的多元醇残基。(D3)在式(1)中,R1表示氢原子或甲基基团,R2和R3分别表示二价有机基团,R4表示分子量为1000到30000的
硅氧烷残基。(
D4)在式(1)中,R1表示氢原子,R2和R3分别表示二价有机基团,R4表示分子量为500到20000的多元醇单烷基醚残基。