| abstract |
PURPOSE: To provide an unvulcanized rubber compsn. which forms a colored rubber composition by vulcanization, which is neither faded nor discolored, by blending a sulfur-contg. compd., tellurium or selenium, an electrophilic reagent and a colorant with an unvulcanized rubber. n CONSTITUTION: A sulfur-contg. compd. (e.g. TMTM), tellurium or selenium, at least one electrophilic reagent (e.g. AlCl 3 or a mixture of ZnO and ZnCO 3 ) and a colorant selected from org. pigments or dyes and inorg. pigments (e.g. Pigment Yellow or red iron oxide) and blended with an unvulcanized rubber such as natural rubber or polybutadiene rubber to obtain the desired unvulcanized rubber compsn. When this compsn. is vulcanized by heating under pressure, the colorant is modified by the electrophilic reagent and bonded to the double bond or active centre of the rubber molecule, so that a colored rubber compsn. can be obtd. which is hardly faded or discolored. n COPYRIGHT: (C)1985,JPO&Japio |