Patent ID: 7674841

Claim:
A solvent dispersion for a printing ink, wherein a polyethylene-based wax that is produced with a metallocene-based catalyst and is subjected to oxidative modification, and specified by the following (i) to (vii): (i) being an ethylene homopolymer or a copolymer of ethylene and at least one α-olefin selected from α-olefins having 3 to 20 carbon atoms, (ii) having the intrinsic viscosity [η] determined in decalin at 135° C. ranging from 0.06 to 0.35 dl/g, (iii) having the ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) determined by gel permeation chromatography (GPC) ranging from 1.7 to 3.2, (iv) having the ratio (Mz/Mw) of z-average molecular weight (Mz) to weight average molecular weight (Mw) determined by gel permeation chromatography (GPC) ranging from 1.5 to 2.0, (v) having the density ranging from 920 to 980 kg/m 3 , (vi) having the penetration hardness of 5 dmm or less, and (vii) having the acid value ranging from 0.3 to 9.9 KOH-mg/g, is dispersed in the form of fine particles having a volume average particle diameter ranging from 0.3 to 10 μm and at a ratio of 5 to 50 wt. % based on the total weight of the solvent dispersion in a non-aromatic solvent.