Patent ID: 11858821
Assignee: THE GOODYEAR TIRE & RUBBER COMPANY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 15:
16. A method for making pre-hydrophobated precipitated silica in an aqueous medium comprising: (1) dispersing silica, a phase transfer agent, and a silica coupling agent into water to make an aqueous silica slurry, wherein the aqueous silica slurry consists essentially of the silica, the phase transfer agent, the silica coupling agent, optionally a catalyst, and water, wherein the silica is rice hull ash silica and wherein the phase transfer agent is methyl tributyl ammonium chloride; (2) allowing the silica coupling agent to react with the silica at a temperature which is within the range of 20° C. to 100° C. to produce the pre-hydrophobated precipitated silica; and (3) recovering the pre-hydrophobated precipitated silica from the aqueous silica slurry.