| abstract |
The epoxy resin composition of the present invention comprises an epoxy resin, a phenol resin, a curing accelerator, and a curing retarder, wherein the curing retarder comprises a lactone compound, and the epoxy resin composition has a melt state , The initial melt viscosity decreases and reaches the lowest melt viscosity and then further increases. The lowest melt viscosity of the epoxy resin composition is defined as eta 1, and the viscosity three times as large as eta 1 is defined as eta 3 , S3 is the ratio of S3 / S1 not less than 3.5 to not more than 15 when the time from the start of measurement to eta 1 is S1 and the time from reaching eta 1 to reaching eta 3 is S3. |