Patent ID: 7951310

Claim:
A nanophase carbon black grafted with organic compounds, comprising: (a) a first component: 100 parts by weight of ungrafted carbon black particles; and (b) a second component: 5-300 parts by weight of at least one organic compound having or producing free radicals, wherein the at least one organic compound is grafted onto the surface of the carbon black particles, wherein the molecular weight of the at least one organic compound is 100-10000, and said nanophase carbon black after grafting has a particle size of 1-100 nm; wherein the nanophase carbon black grafted with organic compounds is prepared by a method comprising the following steps: applying a mechanical shearing force in the presence of ungrafted carbon black and at least one organic compound having or producing free radicals at a temperature above the melting point of the at least one organic compound having and producing free radicals; wherein the mechanical shearing force is applied so as to allow breakage of a solid form of the ungrafted carbon black, production of free radicals on the surface of the ungrafted carbon black and breakage of the at least one organic compound to produce free radicals; wherein the iodine absorption value of said grafted carbon black is 30-80 g/kg, its dibutyl phthalate (DBP) absorption value is 50-100 ml/100 g, and its cetyltrimethyl ammonium bromide (CTAB) absorptive surface area is 50-100 m 2 .