LOW SHEAR METHOD OF DISPERSING CARBON BLACK IN LIQUID ELASTOMERS

摘要

A low shear method of adequately dispersing carbon black in liquid elastomers comprises adding to a low shear mixer a liquid elastomer and from 30 to about 160 parts by weight based on 100 parts of the liquid elastomer of an oil beaded carbon black containing from 25 to about 100 parts by weight of carbon black and from 5 parts to about 60 parts by weight of a hydrocarbon oil. and mixing the compounds in the mixer to product a low viscosity carbon black dispersed elastomeric composition. It has unexpectedly been found that hydrocarbon oils when added to carbon black and mixed to form oil beaded carbon blacks greatly reduce the amount of shear or energy requirements necessary to disperse the carbon black in the liquid elastomers.