According to the present invention (1), an alicyclic diepoxy compound represented by the following general formula (I):
can be produced in high purity and high yields at low cost, by epoxidizing the corresponding alicyclic diolefin compound with an organic percarboxylic acid. As the alicyclic diepoxy compound lacks an ester group in the molecule, it will show high reactivity for a cationic catalyst. Besides, when it is used as a curable epoxy resin composition of the present invention (2), it will show an effect of lowering its curing temperature or reducing its curing time. The curable epoxy resin composition has high reactivity for various curing agents, low viscosity, and excellent workability. Moreover, the curable resin composition is also superior in that it has less effect to working surroundings, and a cured product thereof shows useful physical properties for the uses in coatings, ink, adhesives, sealants, encapsulants, and the like. Furthermore, as a resin composition of the present invention (3) shows a low coefficient of water absorption, it is of extremely high quality as an epoxy resin composition for the encapsulation of electronic parts. In addition, a stabilizer for an electrical insulating oil of the present invention (4) (i.e., the alicyclic diepoxy compound or an electrical insulating oil containing such a compound) is low in acid value, and the stabilizer improves the properties of the insulating oil. In addition, a cured product obtained by curing a casting epoxy resin composition for electrical insulation of the present invention (5) has excellent properties such as high bending strength, high Tg, and low permittivity.
根据本发明(1),由以下通式(I)代表的脂环族二环氧化合物:
通过将相应的脂环族二烯烃化合物与有机过
羧酸进行环氧化反应,可以低成本、高纯度和高产率地生产这种化合物。由于脂环族二环氧化合物分子中缺少酯基,因此对阳离子催化剂的反应活性较高。此外,当它用作本发明的可固化环氧
树脂组合物(2)时,会显示出降低固化温度或缩短固化时间的效果。这种可固化环氧
树脂组合物对各种固化剂的反应活性高,粘度低,可加工性好。此外,这种可固化
树脂组合物还具有对工作环境影响较小的优点,其固化产品在涂料、油墨、粘合剂、密封剂、封装剂等用途中显示出有用的物理性质。此外,由于本发明的
树脂组合物(3)的吸
水系数较低,因此作为用于电子零件封装的环氧
树脂组合物具有极高的品质。此外,本发明的电气绝缘油(4)(即脂环二环氧化合物或含有这种化合物的电气绝缘油)的稳定剂酸值低,稳定剂可改善绝缘油的性能。此外,通过固化本发明用于电气绝缘的浇注环氧
树脂组合物(5)得到的固化产品具有优异的性能,例如高弯曲强度、高 Tg 和低介电常数。