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Polymeric particle dispersions are used for paint, cosmetics, and various oils for engineering to modify viscosity and surface properties. In these usages, however, when we increase the particle content, the viscosity increases rapidly and become uncontrollable. So we use the dispersions only in a narrow content range in many cases. And when we want to use high concentrated dispersion, we usually use a dispersant which can control the viscosity. In the case of polyethylene (PE) particle, however, the crystallinity of the particle is so high and the particle does not have any polar functional groups. There is few good dispersant which has an ability to interact with PE particle and can control the viscosity of the dispersion. Recently, we found a block copolymer constructed with side chain crystalline monomers and solvent compatible monomers (Side Chain Crystalline Block Copolymer : SCCBC), which can be used as a good dispersant for the concentrated PE particle dispersion. In the case of the concentrated small high density PE particle dispersion system (diameter is 7.4 um), that 40 wt% of PE particle is dispersed in acetic acid n-butyl ester, the viscosity has decreased from 1340 mPa•s to 6.2 mPa•s (about 0.5 % of the original value). Table I shows viscosity changes of various polymeric particle dispersions after addition of the SCCBC. From this table, the ratio of the change mainly depends on the crystallinity of particles and chemical structure of crystals. In the previous paper, we showed that this dispersant mechanism can be extended to various kinds of particle dispersion systems. The schematic mechanism of this dispersant is shown in Fig. 1. The long side chain (n≥10: n means the number of carbons in a side chain) has an ability to crystallize by Thermal Rheological Fluid Properties of Particle Dispersion Systems using Side Chain Crystalline Block Copolymer III.