Patent ID: 7964033

Claim:
A method of modifying a pigment, the method comprising: reacting a reactive compound having an X-[Y] n reactive group with a secondary compound N-S-ZM to form a substituted reactive intermediate [Y] a -X-(N-S-ZM) b ; and reacting a pigment with the substituted reactive intermediate [Y] a -X-(N-S-ZM) b to attach the substituted reactive intermediate to the surface of the pigment to form a surface modified pigment; wherein X is a sulfonyl, phosphoryl, or 1,3,5-triazinyl group; Y is a halogen leaving group; N is a nucleophilic group; S is an organic group; ZM is an ionizable end group; n is an integer between 1 and 3; b is an integer between 1 and 3; and a =n−b; wherein n is equal to or greater than b; and wherein if b is 2 or 3, each N-S-ZM can be the same or different.