| 摘要 |
PROBLEM TO BE SOLVED: To obtain a curing agent capable of rapidly curing a resin at a low to ordinary temperature and excellent in storage stability by incorporating a plasticizer and cyclopentanone peroxide. SOLUTION: This agent comprises a plasticizer, desirably, an alcohol ester of an aromatic dibasic acid, more desirably, dimethyl phthalate and cyclopentanone peroxide. It is desirable from the viewpoint of safety that the concentration of cyclopentanone peroxide is about 55% at the maximum and is usually 20-50%. Although cyclopentanone peroxide decomposes easily than conventionally used cyclohexanone peroxide does and decomposed rapidly under low-temperature conditions, it can be produced and safely stored by the reaction of cyclopentanone with an excess of H2O2 in the presence of an aromatic ester- type plasticizer as both an extraction solvent and a stabilizer against decomposition and immediately transferring the formed peroxide to the plasticizer layer.
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