| 摘要 |
PURPOSE:To obtain a resin composition which is excellent in curability and workability and can give a cured product excellent in heat stability, by mixing a specified vinyl ester with an aromatic vinyl compound. CONSTITUTION:A vinyl ester (A) is obtained by reacting a cresol novolak epoxy resin (a) with 0.7-1.2mol, per mol of the epoxy groups of component (a), of acrylic acid (b) at 80-150 deg.C in the presence of an esterification catalyst (e.g., triethylamine) and a polymerization inhibitor (e.g., hydroquinone). 30-90wt% component A is mixed with 70-10wt% aromatic vinyl compound (e.g., styrene) and, if necessary, a thickener, a shrinkage-lowering agent, a thixotropic agent, a plasticizer, a colorant, etc., are added to the obtained mixture to form the titled composition. This composition is mixed with a reinforcing material (e.g., glass fiber) and a filler (e.g., silica) and the resulting mixture is cured by molding to obtain a cured molding.
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