| 摘要 |
[PROBLEMS] To resolve blister formation phenomenon. [MEANS FOR SOLVING PROBLEMS] Drop optical fiber cable (1) comprises core optical fibers (2,3), tension member (4), supporting wire (5) and main body coating (6). The tension member (4) consists of an FRP tension member having an FRP portion comprising reinforcing fibers bound together with a thermosetting resin. In the FRP tension member, it is required for the residual styrene monomer content of the FRP portion to be 0.018 wt.% or less (based on the weight of FRP portion). When the amount of residual styrene monomer exceeds the above content, for example, contact with molten main body coating thermoplastic resin would occur during the main body coating step of the drop optical fiber cable production process to thereby cause evaporation of residual styrene monomer, resulting in abnormalities, such as blistering, in the coating portion or main body coating portion. Controlling of the content of residual styrene monomer so as to be given value or below can be accomplished by selections of highly reactive thermosetting resin and highly reactive catalyst, securement of curing time, post-treatment after curing, etc.
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