| abstract |
A pigment dispersant comprising: (a) 5 to 30% by weight of 5 monomer units of aromatic and / or heterocyclic vinyl, (b) 10 to 30% by weight of monomer units having acid groups, (c) 40 to 80% by weight of monomer units of (meth) acrylate ester, and (d) 5 to 30% by weight of monomer units having poly (alkylene (C2-6) glycol) chains or ether chains mono (C1-22 alkyl) of said glycol, said poly (C2-6) glycol chains having) or mono (C1-22 alkyl) ether chains having a number average molecular weight of 150 to 1,500, assuming a sum of said monomer units (a) to (d) up to 100% by weight, wherein said pigment dispersant has an acid value of 30 to 300 mgKOH / g, a number average molecular weight of 5,000 to 30,000, and a content of organic compounds, whose boiling points are not higher than 250 ° C, not exceeding 0.2% by weight. |