| abstract |
(57) [Abstract] [PROBLEMS] To provide an article having a marking or an identification coating on the surface of unvulcanized or partially vulcanized rubber, which disappears when the rubber is vulcanized. [Structure] A coating composition consisting of zinc stearate as a main component, a phenol formaldehyde resin as a binder, a solvent mainly containing methylcyclopentane, a suspending agent, a filler, carbon black and a dispersing and wetting agent is used as a natural rubber. , SBR rubber, carbon black, process oil, and other non-vulcanized rubber test pieces made of zinc oxide, zinc stearate, deterioration inhibitor, accelerator and sulfur. To form a continuous white, dull film. When this coated rubber test article was vulcanized at about 150 ° C., the color of the coating disappeared, giving a black, slightly glossy appearance. |