| 摘要 |
<p>PURPOSE: To prevent the stress cracks of a thermoplastic die by an epoxy resin filler and heat cycle cracks of the epoxy resin filler itself from developing by including specific polyglycol diepoxide into an epoxy resin composition at a specific ratio and increasing the impact strength of the filler and a final composite. CONSTITUTION: A thermoplastic shell die may be formed of either of various thermoplastic materials containing a polyester material, polysulfone, polyesterimide or the like. A heat-curable resin composition is provided which is substantially composed of an epoxy resin composition of 25-75% of 1.2-epoxy resin having at least, two pieces of epoxy group per molecule and 75-25% of polyglycol diepoxide having a viscosity of 2000-5000 cps, a small but effective amount of phenol promoter and a curing catalyst. Further, as an additional component for enhancing the fluidity by adjusting the viscosity, the glycidyl ether of aliphatic alcohol with 8-14 carbon atoms per molecule may be included into the resin composition.</p> |
