| 主权项 |
1. An aqueous pigment dispersion comprising an aqueous vehicle, a pigment and a dispersant to disperse said pigment in said aqueous vehicle, wherein said dispersant is a polyurethane having a general structure of Formula I: wherein each Y is —(C═O)NHW1N(C═O)OR2, —(C═O)NHW1NCO, —(C═O)NH(CH2)mSi(R4)3 or H;
each X is O, S or NR3;each R1 is C1-C20 alkyl, C6-C40 aryl, polyester, polycarbonate, polyamide or polyurethane, each substituted by one or more hydrophilic groups;each R2 is C1-C20 alkyl, C3-C20 substituted alkyl, C6-C40 aryl or C9-C40 substituted aryl;each R3 is H, C1-C20 alkyl, C3-C20 substituted alkyl, C6-C40 aryl or C9-C40 substituted aryl;each R4 is independently H, C1-C20 alkyl, C3-C20 substituted alkyl, C6-C40 aryl, C9-C40 substituted aryl or OR5;each R5 is independently H, C1-C20 alkyl or C6-C40 aryl;each W1 is independently C4-C20 alkyl, C4-C20 substituted alkyl, C6-C20 cycloalkyl, C6-C20 substituted cycloalkyl, C6-C40 aryl or C9-C40 substituted aryl;each W2 is C1-C20 alkyl or C2-C20 substituted alkyl;m is an integer from 1 to 15; andn is an integer from 1 to 200. |
