and the cooling speed was 10 u00b0 c min during the cooling the prepared aqueous dispersion of pseudopolyrotaxane was a milky dispersion with good fluidity and the viscosity and the particle size were measured by the same methods as in example 1 the measurement showed that the aqueous dispersion of pseudopolyrotaxane had a viscosity of 180 mpa u00b7 s and the particles in the aqueous dispersion of pseudopolyrotaxane had a volume average particle size of 34 u03bcm the aqueous dispersion of pseudopolyrotaxane kept its fluidity after left to stand a whole day and night the viscosity of the aqueous dispersion of pseudopolyrotaxane after the standing was also measured by the same method and was 200 mpa u00b7 s no particles sedimented after the whole day and night standing that is the dispersion stability was good an aqueous dispersion of pseudopolyrotaxane was obtained in the same manner as in example 1 except that the stirring speed of a stirring blade was 100 rpm tip speed 0 4 m sec and the cooling speed was 0 1 u00b0 c min during the cooling the prepared aqueous dispersion of pseudopolyrotaxane was a milky dispersion with good fluidity and the viscosity and the particle size were measured by the same methods as in example 1 the measurement showed that the viscosity of the aqueous dispersion of pseudopolyrotaxane was 160 mpa u00b7 s and the volume average particle size of the particles in the aqueous dispersion of pseudopolyrotaxane was 47 u03bcm the aqueous dispersion of pseudopolyrotaxane kept its fluidity after left to stand a whole day and night the viscosity of the aqueous dispersion of pseudopolyrotaxane after the standing was also measured by the same method and was 190 mpa u00b7 s no particles sedimented after.