fluidity the resultant dispersion was dried in the same manner as in example 1 thereby yielding a dry pseudopolyrotaxane the film thickness of aqueous dispersion of pseudopolyrotaxane applied on the drum was 0 3 mm the dry pseudopolyrotaxane had a water content of 3 1 by weight a dry pseudopolyrotaxane was obtained in the same manner as in example 1 except that the peg having a carboxyl group at each end prepared in production example 2 was used the prepared aqueous dispersion of pseudopolyrotaxane was in a milky form with slight fluidity and had a median particle size of 15 u03bcm the film thickness of aqueous dispersion of pseudopolyrotaxane applied on the drum was 0 3 mm the dry pseudopolyrotaxane had a water content of 3 6 by weight an aqueous dispersion of pseudopolyrotaxane was obtained in the same manner as in example 7 except that in the preparation of the aqueous dispersion of pseudopolyrotaxane the prepared mixture was cooled by allowing it to stand without stirring since the prepared aqueous dispersion of pseudopolyrotaxane had no fluidity the dispersion was diluted with 250 g of water the solids concentration of the aqueous dispersion of pseudopolyrotaxane 10 by weight and stirred with a spatula to give slight fluidity the resultant dispersion was dried in the same manner as in example 1 thereby yielding a dry pseudopolyrotaxane the film thickness of aqueous dispersion of pseudopolyrotaxane applied on the drum was 0 3 mm the dry pseudopolyrotaxane had a water content of 3 4 by weight a pseudopolyrotaxane was obtained in the same manner as in example 1 except that the aqueous dispersion of pseudopolyrotaxane was freeze dried dried at u2212 10 to 20 u00b0 c for.