Patent ID: 7560161

Claim:
A surface-grafted material comprising an inorganic filler, a linking group, and a hole transport moiety capable of transporting holes, wherein said hole transport moiety is selected from the group consisting of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-(1,1′-biphenyl)-4,4′-diamine, N,N′-diphenyl-N,N′-bis(halophenyl)-1,1′-biphenyl-4,4′-diamine, N,N′-diphenyl-N,N′-bis(alkylphenyl)-1,1-biphenyl-4,4′-diamine, N,N-diphenyl-(1,1′-biphenyl)-4-amine, N,N-diphenyl-(alkylphenyl)-amine, 1-phenyl-3-(4′-diethylamino styryl)-5-(4″-diethylamino phenyl) pyrazoline, N-phenyl-N-methyl-3-(9-ethyl)carbazyl hydrazone, 4-diethyl amino benzaldehyde-1,2-diphenyl hydrazone, 2,5-bis(4-N,N′-diethylaminophenyl)-1,3,4-oxadiazole, and mixtures thereof, and said hole transport moiety is grafted to a surface of said inorganic filler via said linking group, wherein said inorganic filler is selected from the group consisting of titanium dioxide, aluminum oxide, zinc oxide, and mixtures thereof.