Patent ID: 9238696
Filing Date: 2016-01-19
CPC Classification: C08B,C08G,C08J,C08L

Claim Text:
1. A method of producing a powdered hydrophilic modified polyrotaxane, comprising: a hydrophilic modification step of preparing a solution comprising a hydrophilic modified polyrotaxane that is formed by modifying all or part of hydroxyl groups on a cyclodextrin included in a polyrotaxane having hydrophilic modifying groups, a polyethylene glycol included in cavities of molecules of the cyclodextrin in a skewered manner, and a capping group that is placed at an each end of the polyethylene glycol and prevents dissociation of the cyclodextrin molecules from the polyethylene glycol; and a drying step of spraying the prepared solution of the hydrophilic modified polyrotaxane and drying the solution of the hydrophilic modified polyrotaxane in a heated gas stream, wherein the drying step is carried out in a spray dryer having an inlet temperature of the spray dryer in a range from 70° C. to 200° C. and an outlet temperature in a range from 55° C. to 105° C.