| abstract |
PURPOSE:To obtain a sulfur-crosslinking age resistor for rubber, which has excellent ozone resistance, flex resistance, and heat resistance, and maintains the effect for a long time, by compounding a bismaleimide and p-phenylenediamine. CONSTITUTION:An age resistor comprising a bismaleimide of formula I [e.g. N,N'-hexamethylenebismaleimide or N,N'-(m-phenylene)bismaleimide] and a p- phenylenediamine of formula II (e.g. N-phenyl-N'-isopropyl-p-phenylenediamine). This age resistor is added to a synthetic rubber such as a styrene-butadiene copolymer rubber, and an ethylene-propylene-diene terpolymer rubber as well as to a natural rubber, usually in an amount of 0.1-7pts.wt. based on 100pts.wt. rubber. |