Method for producing refined polyrotaxane
AssigneesSumitomo Seika Chemicals Co., Ltd., Advanced Softmaterials Inc.
InventorsTomoaki Yamasaki, Shinya Okazaki, Hiroki Okazaki, Shigeki Hamamoto, Changming Zhao
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Abstract
The present invention aims to provide a method for producing a refined polyrotaxane which includes an industrially advantageous method of producing a polyrotaxane that has excellent storage stability. The method for producing a refined polyrotaxane includes the step of heat-cleaning a polyrotaxane with a cleaning medium, the polyrotaxane containing cyclodextrin molecules, a polyethylene glycol which is included in the cavities of the cyclodextrin molecules in a skewered manner, and a capping group that is placed at each end of the polyethylene glycol and prevents dissociation of the cyclodextrin molecules from the polyethylene glycol.
Claims6
A method for producing a refined polyrotaxane, comprising:
- mixing a polyethylene glycol and a cyclodextrin in an aqueous medium to form an aqueous dispersion of pseudopolyrotaxane that contains the polyethylene glycol which is included in the cavities of the cyclodextrin molecules in a skewered manner;
- spray-drying the aqueous dispersion of pseudopolyrotaxane to obtain a powdery dry pseudopolyrotaxane;
- and
- a capping step comprising dispersing the dry pseudopolyrotaxane in a medium that does not dissolve the pseudopolyrotaxane and introducing a capping group at each end of the polyethylene glycol of the pseudopolyrotaxane to produce polyrotaxanee;
- and
- heat-cleaning the polyrotaxane with a cleaning medium.
Dependencies are inferred from the claim text.