PURPOSE: To provide the titled composition capable of ascertaining the uniform mixing of a curing agent by the state of color development, fading its color by the decomposition of a peroxide after curing, and preventing the partial undercure of the molded product, by adding a specific dye to an organic peroxide used as the curing agent.
CONSTITUTION: An organic peroxide used as the curing agent for an unsaturated polyester resin is incorporated with an oil-soluble dye of formula I (X is -OCH3, -SO2CH3, or -Cl; R1 is H, -CH3, -C2H5, or -C2H4OH; R2 is -C2H4OH, -C2H4OCOCH3, or -C2H4CN; R3 is H, -NHCOCH3, etc.), formula II. (R4 is -C2H5 or -CH3; R5 is -C2H4OH, -C2H4OCOCH3, etc.), or formula III. The amount of the dye is ≤5wt% based on the peroxide.
AIGA HIROSHI
SAKAI TSUNEHIRO
