The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2016
Filed:
Dec. 05, 2011
Tomoaki Yamasaki, Hyogo, JP;
Shinya Okazaki, Hyogo, JP;
Hiroki Okazaki, Hyogo, JP;
Shigeki Hamamoto, Hyogo, JP;
Yuki Hayashi, Chiba, JP;
Minoru Iwata, Chiba, JP;
Tomoaki Yamasaki, Hyogo, JP;
Shinya Okazaki, Hyogo, JP;
Hiroki Okazaki, Hyogo, JP;
Shigeki Hamamoto, Hyogo, JP;
Yuki Hayashi, Chiba, JP;
Minoru Iwata, Chiba, JP;
Sumitomo Seika Chemicals Co., Ltd., Hyogo, JP;
Abstract
The present invention aims to provide a method of producing a powdered hydrophilic modified polyrotaxane, which enables production of a powdered hydrophilic modified polyrotaxane excellent in storage stability in an industrially advantageous way. The present invention provides a method of producing a powdered hydrophilic modified polyrotaxane, comprising: a hydrophilic modification step of preparing a solution of a hydrophilic modified polyrotaxane by modifying all or part of hydroxy groups on a cyclodextrin of a polyrotaxane with hydrophilic modifying groups, the polyrotaxane containing the cyclodextrin, a polyethylene glycol 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; 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.