Method for producing pseudopolyrotaxane aqueous dispersion

Patent metadata

Field	Value
Publication number	US-9475908-B2
Application number	US-201113994551-A
Country	US
Kind code	B2
Filing date	Dec 5, 2011
Priority date	Dec 16, 2010
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

The present invention aims to provide an industrially advantageous method for producing an aqueous dispersion of pseudopolyrotaxane enabling to produce an aqueous dispersion of pseudopolyrotaxane having good fluidity and excellent dispersion stability of the pseudopolyrotaxane particles therein. The present invention relates to a method for producing an aqueous dispersion of pseudopolyrotaxane. The method includes: a mixing step of a dissolving polyethylene glycol and a cyclodextrin in an aqueous medium to prepare a mixed solution; and a cooling step of continuously or intermittently cooling the mixed solution in a state of flux to precipitate pseudopolyrotaxane particles. The pseudopolyrotaxane particles contain the polyethylene glycol which is included in the cavities of the cyclodextrin molecules in a skewered manner.

First claim

The invention claimed is:

1. A method for producing an aqueous dispersion of pseudopolyrotaxane, the method comprising:
a mixing step of dissolving polyethylene glycol and cyclodextrin in an aqueous medium so as to prepare a mixed solution; and
a cooling step of continuously or intermittently cooling the mixed solution in a flux state without being left to stand so as to precipitate pseudopolyrotaxane particles,
wherein a weight ratio between polyethylene glycol and cyclodextrin is in a range from 1:3 to 1:5,
the pseudopolyrotaxane particles contain the polyethylene glycol that is included in the cavities of the cyclodextrin molecules in a skewered manner,
wherein an end-point temperature of the cooling in the cooling step is in a range from 5° C. to 20° C.,
a cooling speed in the cooling step is in a range from 0.01° C. to 30° C./min,
the cooling step of the continuously or intermittently cooling the mixed solution is preformed while continuously stirring the mixed solution with a stirring blade, and
a tip speed of the stirring blade used in the cooling step is in a range from 0.1 to 50 m/sec.

2. The method for producing the aqueous dispersion of pseudopolyrotaxane according to claim 1 ,
wherein the polyethylene glycol has a weight average molecular weight in a range from 1,000 to 500,000.

3. The method for producing the aqueous dispersion of pseudopolyrotaxane according to claim 1 ,
wherein the aqueous dispersion of pseudopolyrotaxane has a solid concentration in a range from 5 to 25% by weight.

4. The method for producing the aqueous dispersion of pseudopolyrotaxane according to claim 1 ,
wherein the particles in the aqueous dispersion of pseudopolyrotaxane have a volume average particle size in a range from 1 to 200 μm.

Assignees

• Yamasaki Tomoaki
• Okazaki Shinya
• Okazaki Hiroki
• Hamamoto Shigeki
• Zhao Changming
• Sumitomo Seika Chemicals
• Advanced Softmaterials Inc

Inventors

• Yamasaki Tomoaki
• Okazaki Shinya
• Okazaki Hiroki
• Hamamoto Shigeki
• Zhao Changming

Classifications

• C08L5/16

  Cyclodextrin; Derivatives thereof · CPC title

• C08G83/008

  Supramolecular polymers · CPC title

• C08B37/0015

  Inclusion compounds, i.e. host-guest compounds, e.g. polyrotaxanes · CPC title

• C08J3/03

  in aqueous media · CPC title

• C08J3/16

  by coagulating dispersions {(C08J3/122 takes precedence)} · CPC title